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Enhancing photo-generated carriers transfer of K-C_(3)N_(4)/UiO-66-NH_(2) with Er doping for efficient photocatalytic oxidation of furfural to furoic acid
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作者 WANG Haocun LIU Lingtao +1 位作者 BIAN Junjie LI Chunhu 《燃料化学学报(中英文)》 EI CAS CSCD 北大核心 2024年第11期1617-1628,共12页
Biomass-derived platform molecules,such as furfural,are abundant and renewable feedstock for valuable chemical production.It is critical to synthesize highly efficient photocatalysts for selective oxidation under visi... Biomass-derived platform molecules,such as furfural,are abundant and renewable feedstock for valuable chemical production.It is critical to synthesize highly efficient photocatalysts for selective oxidation under visible light.The Er@K-C_(3)N_(4)/UiO-66-NH_(2) catalyst was synthesized using a straight-forward hydrothermal technique,and exhibited exceptional efficiency in the photocatalytic oxidation of furfural to furoic acid.The catalyst was thoroughly characterized,confirming the effective adjustment of the band gap energy of Er@K-C_(3)N_(4)/UiO-66-NH_(2).Upon the optimized reaction conditions,the conversion rate of furfural reached 89.3%,with a corresponding yield of furoic acid at 79.8%.The primary reactive oxygen species was identified as·O_(2)^(-) from ESR spectra and scavenger tests.The incorporation of Er and K into the catalyst enhanced the photogenerated carriers transfer rate,hence increasing the separating efficiency of photogenerated electron-hole pairs.This study expands the potential applications of rare earth element doped g-C_(3)N_(4) in the photocatalytic selective oxidation of furfurans. 展开更多
关键词 FURFURAL furoic acid selective catalytic oxidation MOFS carbon nitride
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Fabrication of highly dispersed carbon doped Cu-based oxides as superior selective catalytic oxidation of ammonia catalysts via employing citric acid-modified carbon nanotubes doping CuAl-LDHs
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作者 Fengrong Li Xuezhen Liu +3 位作者 ZhengYi Zhao Xia An Yali Du Xu Wu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第11期185-196,共12页
In this work,the CuAl-LDO/c-CNTs catalyst was fabricated via in situ oriented assembly of layered-double hydroxides(LDHs)and citric acid-modified carbon nanotubes(c-CNTs)followed by annealing treatment,and evaluated i... In this work,the CuAl-LDO/c-CNTs catalyst was fabricated via in situ oriented assembly of layered-double hydroxides(LDHs)and citric acid-modified carbon nanotubes(c-CNTs)followed by annealing treatment,and evaluated in the selective catalytic oxidation(SCO)of NH_(3)to N_(2).The CuAl-LDO/c-CNTs catalyst presented better catalytic performance(98%NH_(3)conversion with nearly 90%N_(2)selectivity at 513 K)than other catalysts,such as CuAlO_(x)/CNTs,CuAlO_(x)/c-CNTs and CuAl-LDO/CNTs.Multiple characterizations were utilized to analyze the difference of physicochemical properties among four catalysts.XRD,TEM and XPS analyses manifested that CuO and Cu_(2)O nanoparticles dispersed well on the surface of the Cu Al-LDO/c-CNTs catalyst.Compared with other catalysts,larger specific surface area and better dispersion of CuAl-LDO/c-CNTs catalyst were conducive to the exposure of more active sites,thus improving the redox capacity of the active site and NH_(3)adsorption capacity.In-situ DRIFTS results revealed that the internal selective catalytic reduction(iSCR)mechanism was found over CuAl-LDO/c-CNTs catalyst. 展开更多
关键词 Selective catalytic oxidation of ammonia Layered-double hydroxides Cu-based oxides CNTS Citric acid-modified
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Progress in research on catalysts for catalytic oxidation of formaldehyde 被引量:38
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作者 拜冰阳 乔琦 +1 位作者 李俊华 郝吉明 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第1期102-122,共21页
Formaldehyde(HCHO)is carcinogenic and teratogenic,and is therefore a serious danger to human health.It also adversely affects air quality.Catalytic oxidation is an efficient technique for removing HCHO.The developme... Formaldehyde(HCHO)is carcinogenic and teratogenic,and is therefore a serious danger to human health.It also adversely affects air quality.Catalytic oxidation is an efficient technique for removing HCHO.The development of highly efficient and stable catalysts that can completely convert HCHO at low temperatures,even room temperature,is important.Supported Pt and Pd catalysts can completely convert HCHO at room temperature,but their industrial applications are limited because they are expensive.The catalytic activities in HCHO oxidation of transition-metal oxide catalysts such as manganese and cobalt oxides with unusual morphologies are better than those of traditional MnO2,Co3O4,or other metal oxides.This is attributed to their specific structures,high specific surface areas,and other factors such as active phase,reducibility,and amount of surface active oxygens.Such catalysts with various morphologies have great potential and can also be used as catalyst supports.The loading of relatively cheap Ag or Au on transition-metal oxides with special morphologies potentially improves the catalytic activity in HCHO removal at room temperature.The preparation and development of new nanocatalysts with various morphologies and structures is important for HCHO removal.In this paper,research progress on precious-metal and transition-metal oxide catalyst systems for HCHO oxidation is reviewed; topics such as oxidation properties,structure–activity relationships,and factors influencing the catalytic activity and reaction mechanism are discussed.Future prospects and directions for the development of such catalysts are also covered. 展开更多
关键词 FORMALDEHYDE catalytic oxidation Metal oxide catalyst Noble metal catalyst Low-temperature catalytic activity
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Pd micro-nanoparticles electrodeposited on graphene/polyimide membrane for electrocatalytic oxidation of formic acid 被引量:3
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作者 张焱 王琴 +2 位作者 叶为春 李佳佳 王春明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第9期2986-2993,共8页
A novel Pd electrocatalyst with flowerlike micro-nanostructures was synthesized by electrochemical deposition on a flexible graphene/polyimide(Gr/PI) composite membrane and characterized by scanning electron microsc... A novel Pd electrocatalyst with flowerlike micro-nanostructures was synthesized by electrochemical deposition on a flexible graphene/polyimide(Gr/PI) composite membrane and characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD).The Pd micro-nanoparticles were prepared on a COOH-CNTs/PI membrane as a comparative sample.The XRD and SEM investigations for Pd electrodeposition demonstrate that the particle size of Gr/PI composite membrane is smaller than that of COOH-CNTs/PI membrane,while the uniform and dense distribution of Pd micro-nanoparticles on the Gr/PI composite membrane is greater than that on the COOH-CNTs/PI membrane.The electrocatalytic properties of Pd/Gr/PI and Pd/COOH-CNTs/PI catalysts for the oxidation of formic acid were investigated by cyclic voltammetry(CV) and chronoamperometry(CA).It is found that the electrocatalytic activity and stability of Pd/Gr/PI are superior to those of Pd/COOH-CNTs/PI catalyst.This is because smaller metal particles and higher dense distribution desirably provide abundant catalytic sites and mean higher catalytic activity.Therefore,the Pd/Gr/PI catalyst has better catalytic performance for formic acid oxidation than the Pd/COOH-CNTs/PI catalyst. 展开更多
关键词 Pd micro-nanoparticles graphene/polyimide membrane carboxyl carbon nanotubes/polyimide membrane electro catalytic oxidation formic acid electrochemical deposition
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Low-temperature catalytic oxidation of NO over Mn-Ce-O_x catalyst 被引量:14
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作者 李华 唐晓龙 +1 位作者 易红宏 于丽丽 《Journal of Rare Earths》 SCIE EI CAS CSCD 2010年第1期64-68,共5页
A series of manganese-cerium oxide catalysts were prepared by different methods and used for low-temperature catalytic oxidation of NO in the presence of excess O2.Their surface properties were evaluated by means of B... A series of manganese-cerium oxide catalysts were prepared by different methods and used for low-temperature catalytic oxidation of NO in the presence of excess O2.Their surface properties were evaluated by means of BET and were characterized by using scanning electron microscopy(SEM) and X-ray diffractometer(XRD).The activity test of Mn-Ce-Ox catalysts showed that addition of Ce enhanced the activities of NO oxidation.The most active catalysts with a molar Ce/(Mn+Ce) ratio of 0.3 were prepared by co-precip... 展开更多
关键词 NOx catalytic oxidation NO manganese oxide CERIUM rare earths
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Structural effect and reaction mechanism of MnO_2 catalysts in the catalytic oxidation of chlorinated aromatics 被引量:16
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作者 Xiaole Weng Yu Long +2 位作者 Wanglong Wang Min Shao Zhongbiao Wu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第5期638-646,共9页
Various MnO2 structures have been extensively applied in catalysis. In this study,γ-MnO2,α-MnO2, and δ-MnO2 with corresponding rod, tube, and hierarchical architecture morphologies were prepared and applied for the... Various MnO2 structures have been extensively applied in catalysis. In this study,γ-MnO2,α-MnO2, and δ-MnO2 with corresponding rod, tube, and hierarchical architecture morphologies were prepared and applied for the catalytic oxidation of chlorobenzene (CB). The redox ability, H2O activation behavior, and acidity of MnO2 were analyzed using a range of techniques, including TPR, H2O-TPD, XPS, and pyridine-IR. The catalytic activities in CB oxidation were assessed;this revealed that γ-MnO2 exhibited the highest activity and best stability, owing to its enriched surface oxygen vacancies that functioned to activate O2 and H2O, and capture labile chlorine, which reacted with dissociated H2O to form HCl. All the MnO2 phases generated toxic polychlorinated by-products, including CHCl3, CCl4, C2HCl3, and C2Cl4, indicating the occurrence of electrophilic chlorination during CB oxidation. In particular, the dichlorobenzene detected in the effluents of α-MnO2 might generate unintended dioxins via a nucleophilic substitution reaction. 展开更多
关键词 MnO2 CHLOROBENZENE catalytic oxidation Polychlorinated byproducts Environmental risk
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Hierarchical Ni-Al hydrotalcite supported Pt catalyst for efficient catalytic oxidation of formaldehyde at room temperature 被引量:13
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作者 Zhaoxiong Yan Zhihua Xu +2 位作者 Lin Yue Ling Shi Linyong Huang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第12期1919-1928,共10页
Catalytic oxidation at room temperature is recognized as the most promising method for formaldehyde(HCHO)removal.Pt‐based catalysts are the optimal catalyst for HCHO decomposition at room temperature.Herein,flower‐l... Catalytic oxidation at room temperature is recognized as the most promising method for formaldehyde(HCHO)removal.Pt‐based catalysts are the optimal catalyst for HCHO decomposition at room temperature.Herein,flower‐like hierarchical Pt/NiAl‐LDHs catalysts with different[Ni2+]/[Al3+]molar ratios were synthesized via hydrothermal method followed by NaBH4 reduction of Pt precursor at room temperature.The flower‐like hierarchical Pt/NiAl‐LDHs were composed of interlaced nanoplates and metallic Pt nanoparticles(NPs)approximately 3–4 nm in diameter were loaded on the surface of the Pt/NiAl‐LDHs with high dispersion.The as‐prepared Pt/NiAl21 nanocomposite was highly efficient in catalyzing oxidation of HCHO into CO2 at room temperature.The high activity of the hierarchical Pt/NiAl21 nanocomposite was maintained after seven recycle tests,suggesting the high stability of the catalyst.Based on in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)studies,a reaction mechanism was put forward about HCHO decomposition at room temperature.This work provides new insights into designing and fabricating high‐performance catalysts for efficient indoor air purification. 展开更多
关键词 HYDROTALCITE NiAl‐layered double hydroxides Hierarchical structure catalytic oxidation Formaldehyde removal
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Selective catalytic oxidation of NO over iron and manganese oxides supported on mesoporous silica 被引量:12
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作者 Junfeng Zhang Yan Huang Xia Chen 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2008年第3期273-277,共5页
The selective catalytic oxidation (SCO) of NO was studied on a catalyst consisting of iron-manganese oxide supported on mesoporous silica (MPS) with different Mn/Fe ratios. Effects of the amount of manganese and i... The selective catalytic oxidation (SCO) of NO was studied on a catalyst consisting of iron-manganese oxide supported on mesoporous silica (MPS) with different Mn/Fe ratios. Effects of the amount of manganese and iron, oxygen, and calcination temperature on NO conversion were also investigated. It was found that the Mn-Fe/MPS catalyst with a Mn/Fe molar ratio of 1 showed the highest activity at the calcination temperature of 400 °C. The results showed that over this catalyst, NO conversion reached 70% under the condition of 280 °C and a space velocity of 5000 h-1. SO2 and H2O had no adverse impact on the reaction activity when the SCO reaction temperature was above 240 °C. In addition, the SCO activity was suppressed gradually in the presence of SO2 and H2O below 240 °C, and such an effect was reversible after heating treatment. 展开更多
关键词 selective catalytic oxidation of NO nitrogen monoxide mesoporous silica IRON MANGANESE
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Selective catalytic oxidation of NO with O_2 over Ce-doped MnO_x/TiO_2 catalysts 被引量:26
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作者 Xiaohai Li Shule Zhang +2 位作者 Yong Jia Xiaoxiao Liu Qin Zhong 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2012年第1期17-24,共8页
A series of Ce-doped MnOx/TiO2 catalysts were prepared by impregnation method and used for catalytic oxidation of NO in the presence of excess O2. The sample with the Ce doping concentration of Ce/Mn=l/3 and calcined ... A series of Ce-doped MnOx/TiO2 catalysts were prepared by impregnation method and used for catalytic oxidation of NO in the presence of excess O2. The sample with the Ce doping concentration of Ce/Mn=l/3 and calcined at 300 ℃ shows a superior activity for NO oxidation to NO2. On Ce(1)Mn(3)Ti catalyst, 58% NO conversion was obtained at 200 ℃ and 85% NO conversion at 250 ℃ with a GHSV of 41000 h-1, which was much higher than that over MnOx/TiO2 catalyst (48% at 250 ℃). Characterization results implied that the higher activity of Ce(1)Mn(3)Ti could be attributed to the enrichment of well-dispersed MnO2 on the surface and the abundance of Mn3+ and Zi3+ species. The addition of Ce into MnO2/TiO2 could improve oxygen storage capacity and facilitate oxygen mobility of the catalyst as shown by PL and ESR, so that its activity for NO oxidation could be enhanced. The effect of H2O and SO2 on the catalyst activity was also investigated. 展开更多
关键词 selective catalytic oxidation (SCO) of NO MnOx/TiO2 catalysts Ce-doped catalysts
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2,5-Furandicarboxylic acid production via catalytic oxidation of 5-hydroxymethylfurfural:Catalysts,processes and reaction mechanism 被引量:10
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作者 Chunlin Chen Lingchen Wang +4 位作者 Bin Zhu Zhenqiang Zhou Soliman I.El-Hout Jie Yang Jian Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第3期528-554,共27页
Biomass conversion to value-added chemicals has received tremendous attention for solving global warming issues and fossil fuel depletion.5-Hydroxymethylfurfural(HMF)is a key bio-based platform molecule to produce man... Biomass conversion to value-added chemicals has received tremendous attention for solving global warming issues and fossil fuel depletion.5-Hydroxymethylfurfural(HMF)is a key bio-based platform molecule to produce many useful organic chemicals by oxidation,hydrogenation,polymerization,and ring-opening reactions.Among all derivatives,the oxidation product 2,5-furandicarboxylic acid(FDCA)is a promising alternative to petroleum-based terephthalic acid for the synthesis of biodegradable plastics.This review analytically discusses the recent progress in the thermocatalytic,electrocatalytic,and photocatalytic oxidation of HMF into FDCA,including catalyst screening,synthesis processes,and reaction mechanism.Rapid fundamental advances may be possible in non-precious metal and metal-free catalysts that are highly efficient under the base-free conditions,and external field-assisted processes like electrochemical or photoelectrochemical cells. 展开更多
关键词 5-HYDROXYMETHYLFURFURAL 2 5-Furandicarboxylic acid catalytic oxidation Mechanism
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Simulation and Optimization in the Process of Toluene Liquid-phase Catalytic Oxidation 被引量:6
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作者 张玉坤 李初福 +1 位作者 何小荣 陈丙珍 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第1期36-38,共3页
Liquid-phase oxidation of toluene with air has become the main technology for producing benzoic acid in a reactor at present. Based on the kinetic model of the toluene oxidation process obtained from laboratory and ma... Liquid-phase oxidation of toluene with air has become the main technology for producing benzoic acid in a reactor at present. Based on the kinetic model of the toluene oxidation process obtained from laboratory and mass balance of key component, a novel model is established to simulate the industrial toluene oxidation process, in which the effects of benzaldehyde and benzyl alcohol are considered and the kinetic parameters are revised by industrial data. The simulation results show that the error of benzoic acid yield is within 3.5%. Based on the simulation model, to maximize the benzoic acid yield, an optimization model is proposed to optimize the operating parameters, including toluene feed-in mass flux and temperature. The optimization result indicates that on the allowable operating conditions the maximum benzoic acid yield obtained with the reaction temperature at 167.2 C an the mass flux at 104.1 t·h^- 1 is greater than the current one, which can be used to guide industrial reactor s operation. 展开更多
关键词 TOLUENE benzoic acid catalytic oxidation simulation OPTIMIZATION
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Preparation of magnetic Fe3O4@Cu/Ce microspheres for efficient catalytic oxidation co-adsorption of arsenic(Ⅲ) 被引量:6
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作者 JIN Lin-feng CHAI Li-yuan +2 位作者 SONG Ting-ting YANG Wei-chun WANG Hai-ying 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第4期1176-1185,共10页
Magnetic Fe3 O4@Cu/Ce microspheres were successfully prepared by one-step solvothermal approach and further utilized to remediate toxic arsenic(As(Ⅲ)) pollution. The effects of Cu/Ce elements co-doping on the crystal... Magnetic Fe3 O4@Cu/Ce microspheres were successfully prepared by one-step solvothermal approach and further utilized to remediate toxic arsenic(As(Ⅲ)) pollution. The effects of Cu/Ce elements co-doping on the crystal structure, catalytic oxidation and adsorption behaviors of magnetic microspheres were researched systematically. The results showed that with the aid of Cu/Ce elements, the grain size reduced, lattice defects increased, and the oxygen vacancies and surface hydroxyl groups were improved. Therefore, Cu/Ce elements endowed magnetic Fe3 O4@Cu/Ce microspheres with excellent As(III) removal performance, whose maximum adsorption capacity reached 139.19 mg/g. The adsorption mechanism mainly involved catalytic oxidant co-adsorption. This research developed a feasible strategy for the preparation of high efficiency magnetic adsorbent to enhance the removal of As(Ⅲ). 展开更多
关键词 Cu/Ce magnetic composites AS(III) catalytic oxidation adsorption
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Catalytic Oxidation of Dimethyl Ether to Dimethoxymethane over Cs Modified H_3PW_(12)O_(40)/SiO_2 Catalysts 被引量:7
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作者 Qingde Zhang Yisheng Tan +3 位作者 Caihong Yang Yizhuo Han Jun Shamoto Noritatsu Tsubaki 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2007年第3期322-325,共4页
The attractive utilization route for one-step catalytic oxidation of dimethyl ether to dimethoxymethane was successfully carried out over the H3PW12O40(40%)/SiO2 catalyst, modified by Cs, K, Ni, and V. The Cs modifi... The attractive utilization route for one-step catalytic oxidation of dimethyl ether to dimethoxymethane was successfully carried out over the H3PW12O40(40%)/SiO2 catalyst, modified by Cs, K, Ni, and V. The Cs modification of H3PW12O40(40%)/SiO2 gave the most promising result of 20% dimethyl ether conversion and 34.8% dimethoxymethane selectivity. Dimethoxymethane could be synthe- sized via methoxy groups decomposed from dimethyl ether through the synergistic effect between the acid sites and the redox sites of Cs modified H3PW12O40(40%)/SiO2. 展开更多
关键词 dimethyl ether DIMETHOXYMETHANE catalytic oxidation Cs modified H3PW12O40/SiO2 XRD
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Catalytic Oxidation of Dimethyl Ether to Hydrocarbons over SnO_2/MgO and SnO_2/CaO Catalysts 被引量:6
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作者 Lin Yu Jieyu Xu Ming Sun Xuetao Wang 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2007年第2期200-203,共4页
A novel reverse microemulsion method was used to prepare SnO2/MgO and SnO2/CaO catalysts. It was found that both the catalysts were active for the reaction of catalytic oxidation of dimethyl ether (DME) in the tempe... A novel reverse microemulsion method was used to prepare SnO2/MgO and SnO2/CaO catalysts. It was found that both the catalysts were active for the reaction of catalytic oxidation of dimethyl ether (DME) in the temperature range of 275 to 300 ℃. SnO2/CaO catalyst exhibits much higher activity than SnO2/MgO. On SnO2/CaO catalyst, DME conversion of 21.8% was obtained at 300℃, while selectivities to methyl formate (MF) and dimethoxyethane (DMET) of 19.1% and 59.0% respectively were obtained at 275 ℃. 展开更多
关键词 dimethyl ether catalytic oxidation methyl formate DIMETHOXYETHANE
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A novel process of ozone catalytic oxidation for low concentration formaldehyde removal 被引量:8
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作者 Bin Zhu Xiao‐Song Li +4 位作者 Peng Sun Jing‐Lin Liu Xiao‐Yuan Ma Xiaobing Zhu Ai‐Min Zhu 《Chinese Journal of Catalysis》 CSCD 北大核心 2017年第10期1759-1769,共11页
To reduce energy costs,minimize secondary pollution from undecomposed ozone,and improve the efficiency of ozone use,a novel process of cycled storage‐ozone catalytic oxidation(OZCO)was employed to remove formaldehyde... To reduce energy costs,minimize secondary pollution from undecomposed ozone,and improve the efficiency of ozone use,a novel process of cycled storage‐ozone catalytic oxidation(OZCO)was employed to remove formaldehyde(HCHO)at low concentrations in air.We applied Al2O3‐supported manganese oxide(MnOx)catalysts to this process,and examined the HCHO adsorption capacity and OZCO performance over the MnOx catalysts.Owing to the high dispersion of MnOx and low oxidation state of manganese,the MnOx/Al2O3catalysts with a manganese acetate precursor and10%‐Mn loading showed good performance in both storage and OZCO stages.The presence of H2O led to a decrease of the HCHO adsorption capacity owing to competitive adsorption between moisture and HCHO at the storage stage;however,high relative humidity(RH)favored complete conversion of stored HCHO to CO2at the OZCO stage and contributed to an excellent carbonbalance.Four low concentration HCHO storage‐OZCO cycles with a long HCHO storage period and relatively short OZCO period were successfully performed over the selected MnOx/Al2O3catalyst at room temperature and a RH of50%,demonstrating that the proposed storage‐OZCO process is an economical,reliable,and promising technique for indoor air purification. 展开更多
关键词 Formaldehyde removal STORAGE OZONE catalytic oxidation Manganese oxide catalyst
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Preparation of nitric humic acid by catalytic oxidation from Guizhou coal with catalysts 被引量:9
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作者 Yang Zhiyuan Gong Liang Ran Pan 《International Journal of Mining Science and Technology》 2012年第1期75-78,共4页
Nitric humic acid was prepared by catalytic oxidation between nitric acid and Guizhou coal, with added catalysts. We investigated catalytic oxidation processes and the factors that affect the reactions. The effects of... Nitric humic acid was prepared by catalytic oxidation between nitric acid and Guizhou coal, with added catalysts. We investigated catalytic oxidation processes and the factors that affect the reactions. The effects of different catalysts, including NiSO4 support on active carbon (AC-NiS04), NiS04 support on sil- icon dioxide (SiO2-NiSO4), composites of SO42-1Fe203, Zr-iron and vanadium-iron composite were stud- ied. As well, we investigated nitric humic acid yields and the chemical structure of products by element analysis, FT-IR and E4/E6 (an absorbance ratio at wavelengths of 465 and 665 nm of humic acid alkaline extraction solutions). The results show that the catalytic oxidation reaction with added catalysts can increase humic acid yields by 18.7%, 16.36% 12.94%, 5.61% and 8.59%, respectively. The highest yield of humic acid, i.e., 36.0%, was obtained with AC-NiSO4 as the catalyst. The amounts of C and H decreased with the amount of nitrogen. The increase in the E4/E6 ratio in catalytic oxidation of (Guizhou) coal shows that small molecular weights and high yields of nitric humic acid can be obtained by catalytic oxidation reactions. 展开更多
关键词 Guizhou coal catalytic oxidation Humic acid CATALYSTS
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Selection of Chelated Fe(Ⅲ)/Fe(Ⅱ) Catalytic Oxidation Agents for Desulfurization Based on Iron Complexation Method 被引量:5
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作者 Luo Ying Liu Youzhi +2 位作者 Qi Guisheng Guo Huidong Zhu Zhengfeng 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2014年第2期50-58,共9页
Optimization of factors influencing the experiments on reactions involving 8 different chelating agents and soluble Fe(III)/Fe(II) salts was carried out to yield chelated iron complexes. A combination of optimized inf... Optimization of factors influencing the experiments on reactions involving 8 different chelating agents and soluble Fe(III)/Fe(II) salts was carried out to yield chelated iron complexes. A combination of optimized influencing factors has resulted in a Fe chelating capacity of the iron-based desulfurization solution to be equal to 6.83—13.56 g/L at a redox potential of 0.185—0.3. The desulfurization performance of Fe(III)/Fe(II) chelating agents was investigated on a simulated sulfur-containing industrial gas composed of H2 S and N2 in a cross-flow rotating packed bed. Test results have revealed that the proposed iron-based desulfurization solution showed a sulfur removal efficiency of over 99% along with a Fe chelating capacity exceeding 1.35 g/L. This desulfurization technology which has practical application prospect is currently in the phase of commercial scale-up study. 展开更多
关键词 hydrogen sulfide chelated iron catalytic oxidation factor analysis redox
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Dioxygen Affinities and Catalytic Oxidation Performance of Cobalt (Ⅱ)Complexes with N—Aryl Hydroxamic Acid 被引量:4
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作者 Chun Chun ZHANG Wei ZENG +1 位作者 Jian Zhang LI Sheng Ying QIN 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第6期627-630,共4页
The oxygenation of cobalt (II) hydroxamates (CoL2) and its catalytic performance in oxidation of p-xylene to p-toluic acid (PTA) were examined. The effects of X and Y bonded to hydroxamate group on dioxygen affinitie... The oxygenation of cobalt (II) hydroxamates (CoL2) and its catalytic performance in oxidation of p-xylene to p-toluic acid (PTA) were examined. The effects of X and Y bonded to hydroxamate group on dioxygen affinities and catalytic oxidation performance were also investigated. 展开更多
关键词 Cobalt (II) hydroxamates dioxygen affinities catalytic oxidation p-xylene.
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Titanium-Containing Mesoporous Materials: Synthesis and Application in Selective Catalytic Oxidation 被引量:2
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作者 Jie Li Chunhui Zhou Huali Xie Zhonghua Ge Liangcai Yuan Xiaonian Li 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2006年第3期164-177,共14页
Titanium-containing mesoporous molecular sieves are of great significance in selective catalytic oxidation processes with bulky molecules. Recent researches and developments on the designing and synthesis of Ti-contai... Titanium-containing mesoporous molecular sieves are of great significance in selective catalytic oxidation processes with bulky molecules. Recent researches and developments on the designing and synthesis of Ti-containing mesoporous materials have been reviewed. Various strategies for the preparation of Ti-containing mesoporous materials, such as direct synthesis and post-synthesis, are described. Modifications of Ti-containing mesoporous materials by surface-grafting and atom-planting are also discussed. All approaches aimed mainly at the improving of the stability, the hydrophobicity, and mostly the catalytic activity. Structural and mechanistic features of various synthetic systems are discussed. Ticontaining mesoporous materials in liquid phase catalytic oxidation of organic compounds with H2O2 as an oxidant is briefly summarized, showing their broad utilities for green synthesis of fine chemicals by catalytic oxidative reactions. 展开更多
关键词 mesoporous materials TITANIUM molecular sieve zeolites CHARACTERIZATION catalytic oxidation
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Leaching of chromite ore in concentrated KOH by catalytic oxidation using CuO as catalyst 被引量:2
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作者 Long-jie LIU Hao DU +2 位作者 Yang ZHANG Shi-li ZHENG Yi ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第4期891-900,共10页
CuO was used as a catalyst in the concentrated KOH solution to enhance the leaching of chromium from the chromite ore.The impacts of temperature,KOH-to-chromite ore mass ratio,CuO-to-chromite ore mass ratio,and gas fl... CuO was used as a catalyst in the concentrated KOH solution to enhance the leaching of chromium from the chromite ore.The impacts of temperature,KOH-to-chromite ore mass ratio,CuO-to-chromite ore mass ratio,and gas flow rate on the chromiumleaching rate were investigated.The results indicated that CuO played an important role in improving the chromium leaching rate.The leaching rate reached98%after leaching for6h when CuO was applied,whereas it was only60.8%without CuO under thesame reaction conditions:temperature230°C,KOH-to-ore mass ratio6:1,stirring speed700r/min,gas flow rate1L/min.Accordingto the kinetics study,the catalytic oxidation was controlled by surface chemical reaction and the activation energy was calculated tobe15.79kJ/mol when the temperature was above230°C.In contrast,without CuO,the rate-determining step was external diffusionand the apparent activation energy was38.01kJ/mol. 展开更多
关键词 chromite ore copper oxide LEACHING catalytic oxidation
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