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Ni-Co/Mg-Al catalyst derived from hydrotalcite-like compound prepared by plasma for dry reforming of methane 被引量:9
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作者 Huali Long Yan Xu +4 位作者 Xiaoqing Zhang Shijing Hu Shuyong Shang Yongxiang Yin Xiaoyan Dai 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第5期733-739,共7页
Ni-Co bimetallic catalysts with different Ni/Co content were derived from cold plasma jet decomposition and reduction of hydrotalcite-like compounds containing Ni,Co,Mg and Al,and their catalytic performance was inves... Ni-Co bimetallic catalysts with different Ni/Co content were derived from cold plasma jet decomposition and reduction of hydrotalcite-like compounds containing Ni,Co,Mg and Al,and their catalytic performance was investigated with dry reforming of methane.Experimental results showed that the hydrotalcite-like precursors could be completely decomposed and partly reduced by cold plasma jet,and the Nicontained catalysts exhibited much higher activity than the catalyst without Ni.Especially,the catalyst with Ni/Co ratio of 8/2 achieved not only the highest conversions of 80.3%and 69.3%for CH4 and CO2,respectively,but also the best stability in 100 h testing.The catalysts were characterized by XRD,XPS,TEM and N2 adsorption techniques,and the results showed that the better performance of the 8Ni2Co bimetallic catalyst was attributed to its higher metal dispersion,smaller metal particle size,as well as the interaction effect between Ni and Co,which were brought by the special catalyst preparation method. 展开更多
关键词 dry reforming of methane Ni-Co bimetallic catalyst cold plasma treatment hydrotalcite-like compound
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Studies on the Synthesis and the Structure of Ferric Aluminum Magnesium Hydrotalcite-like Compounds
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作者 Shu Ping LI Wan Guo HOU +1 位作者 Peng JIANG Wei Qun ZHU 《Chinese Chemical Letters》 SCIE CAS CSCD 2002年第8期781-782,共2页
The particles of ferric aluminum magnesium hydrotalcite-like compounds (Fe-Al-Mg_HTlc) were synthesized by co-precipitation method. It was found that when n(Fe)/n(Al+Mg+Fe)<0.30 and n(Al)/n(Al+Mg+Fe)<0.30, pure... The particles of ferric aluminum magnesium hydrotalcite-like compounds (Fe-Al-Mg_HTlc) were synthesized by co-precipitation method. It was found that when n(Fe)/n(Al+Mg+Fe)<0.30 and n(Al)/n(Al+Mg+Fe)<0.30, pure HTlc can be formed; when the molar ratio of Al/ (Fe+Al+Mg)>0.30, Al(OH)3 will emerge; when the molar ratio of Fe/(Fe+Al+Mg) >0.30, the amorphous composition will appear. Hence Fe3+ and Al3+ have no concentration superposition effect on the crystal structure of the samples. 展开更多
关键词 hydrotalcite-like compounds CO-PRECIPITATION synthesis.
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The Isoelectric Point and the Points of Zero Charge of Fe-Al-Mg Hydrotalcite-like Compounds
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作者 DongXiangLI WanGuoHOU +2 位作者 ShuPingLI MingTuHAO GaoYongZHANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第2期224-227,共4页
The relation of the isoelectric point (IEP) and the point of zero net charge (PZNC) of the hydrotalcite-like compounds was discussed. It was found that the IEP does not equal to the PZNC and the IEP is higher than th... The relation of the isoelectric point (IEP) and the point of zero net charge (PZNC) of the hydrotalcite-like compounds was discussed. It was found that the IEP does not equal to the PZNC and the IEP is higher than the PZNC. The structural positive charges existing in the HTlc, which cause the difference between the IEP and the PZNC. The effects of the structural positive charges of the HTlc on its IEP and PZNC are the same as the specific adsorption of metal cations. 展开更多
关键词 Isoelectric point points of zero charge potentiometric titration hydrotalcite-like compounds.
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CoMnMgAl Hydrotalcite-like Compounds and their Complex Oxides: Facile Synthesis and FCC SO_x Removal
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作者 Jiang Ruiyu Wang Min +5 位作者 Zhu Tao Zhou Yudong Song Xinyu Zhang Feng Ding Liang Gao Jian 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2019年第4期29-35,共7页
The X-CoMnMgAl hydrotalcite-like precursors(X-LDHs) were first synthesized by the coprecipitation method using Cl-, CO32-, NO3- and SO42- as the corresponding guest anions, which were further used to prepare X-CoMnMgA... The X-CoMnMgAl hydrotalcite-like precursors(X-LDHs) were first synthesized by the coprecipitation method using Cl-, CO32-, NO3- and SO42- as the corresponding guest anions, which were further used to prepare X-CoMnMgAl complex oxides(X-LDOs) through calcination. The structure and the surface morphology of the as-prepared samples were characterized by FT–IR, XRD, N2 adsorption-desorption and SEM. These as-prepared X-LDOs could act as sulfur-transfer catalysts for desulfurization. The activity of SOx adsorption and regeneration was evaluated via a self-assembled fixed-bed reactor simulating the conditions found in the fluid catalytic cracking units. These four types of sulfur-transfer catalysts with the same phase but different structure displayed the following order of desulfurization efficiency: CO3-LDO >Cl-LDO >NO3-LDO > SO4-LDO. 展开更多
关键词 coprecipitation method hydrotalcite-like compounds sulfur-transfer catalyst desulfurization ef ficiency
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N2O Decomposition over K-Ce Promoted Co-M-AI Mixed Oxide Catalysts Prepared from Hydrotalcite-like Precursors 被引量:1
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作者 张锦丽 吴双 +2 位作者 胡辉 吴高明 曾召伟 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2014年第2期233-239,I0004,共8页
A series of mixed oxide catalysts with different composition of Co-M-Al and Co-M-Ce- Al (M=Zn, Ni, Cu) were prepared by co-precipitation method from hydrotalcite-like compounds. The experimental results revealed the... A series of mixed oxide catalysts with different composition of Co-M-Al and Co-M-Ce- Al (M=Zn, Ni, Cu) were prepared by co-precipitation method from hydrotalcite-like compounds. The experimental results revealed the catalytic activity of Co-Ni-Al is slightly higher than that of Co-Zn-Al and much higher than that of Co-Cu-Al for direct decomposition of N2O. Moreover, addition of small amounts of Ce02 improved the catalytic activity signif- icantly and made the decomposition temperatures at which the N2O conversion was 50% and 90% (T50 and Tgo) both decreased 80 ℃ than those of Co-M-Al catalysts without CeO2 added. Further, potassium-load also promoted the catalytic activity, and the decomposi- tion temperatures of T50 and T90 both decreased approximately 50 ℃. It is significant for decomposing N2O from industries and reducing carbon emission from atmosphere. 展开更多
关键词 N2O Catalytic decomposition hydrotalcite-like compound CEO2 Alkalimetal
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Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater
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作者 Genoveva Rosano-Ortega Carlos Vega Lebrún +3 位作者 Juan M. López Oglesby Sonia Martínez Gallegos Daniel Cruz-González Beatriz Pérez Armendariz 《Green and Sustainable Chemistry》 2013年第2期48-55,共8页
In this paper we are describing a green cycle process. The first step was a novel hydrotalcite-like compound (HTLC) synthesized by a co-precipitating method, under standard ambient temperature and pressure, using chem... In this paper we are describing a green cycle process. The first step was a novel hydrotalcite-like compound (HTLC) synthesized by a co-precipitating method, under standard ambient temperature and pressure, using chemical industry wastewater rich in divalent and trivalent cations, activated by a thermal treatment and finally characterized by scanning electron microscopy (SEM), energy dispersive X-ray fluorescence (EDS) and thermogravimetric analysis (TGA). The second step was a series of batch sorption tests performed with this activated HTLC and untreated underground sulfurous water from the state of Puebla, México. The HTLC calcined at 500°C/3 h exhibited the best sorption ability for ions, demonstrated a decrease of the hardness and sulfate ions to below the regional legal standards for drinking water. Once inactive after being used in water treatment, the sorbed ions were removed by ion exchange in a carbonate-containing solution, resulting in an 80% recycling of the material which upon activation demonstrated a retained capacity for water treatment. This recyclability suggests the exciting possibility of this novel compound as an efficient “green” technology in water treatment processes. 展开更多
关键词 hydrotalcite-like compound WASTEWATER Sulfurous UNDERGROUND Water Ion SORPTION Green Cycle
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Preparation and characterization of a novel strong-fluorescent hydrotalcite-like compound (Al-HTLc) 被引量:6
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作者 ZHANG WenGong CHEN Hong 《Science China Chemistry》 SCIE EI CAS 2008年第9期834-841,共8页
A novel strong-fluorescent hydrotalcite-like compound (Al-HTLc) was synthesized by coprecipitation. In the sample, the content of aluminum(III) in the layers was decreased to a proper value. The Al3+ ions coordinated ... A novel strong-fluorescent hydrotalcite-like compound (Al-HTLc) was synthesized by coprecipitation. In the sample, the content of aluminum(III) in the layers was decreased to a proper value. The Al3+ ions coordinated with 8-hydroxyquinolines (8-HQ) which were dispersed into the anions in the interlayer region. The sample was characterized by XRD, XPS, FT-IR, TG-DSC, UV-Vis, and fluorescence spec- troscopy; its composition and structure were also determined. The results indicate that the sample can emit fluorescence (487 nm) with a strong fluorescence intensity (4.9×105 (a.u.)). The fluorescent lifetime and fluorescence quantum yield of Al-HTLc were measured to be 21.24 ns and 67%, respectively, higher than those of pure 8-hydroxyquinoline aluminum (Alq3). The result of TG-DSC measurement clearly shows the enhanced thermal stability of Al-HTLc compared with that of MgAl-LDH and pure Alq3. Al-HTLc may be used as a novel luminescent functional material. 展开更多
关键词 hydrotalcite-like compound 8-HYDROXYQUINOLINE aluminum INTERCALATION assembly SUPRAMOLECULE fluorescence FLUORESCENT LIFETIME
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Synthesis and characterization of a strong-fluorescent Eu-containing hydrotalcite-like compound 被引量:5
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作者 CHEN Hong & ZHANG WenGong Institute of Polymer Science,College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350007,China 《Science China Chemistry》 SCIE EI CAS 2010年第6期1273-1280,共8页
A novel strong-fluorescent Eu-containing hydrotalcite-like compound (Eu-HTlc) was synthesized using the coprecipitation method,in which aluminum(III) was partially substituted by Europium (III) in the hydrotalcite-lik... A novel strong-fluorescent Eu-containing hydrotalcite-like compound (Eu-HTlc) was synthesized using the coprecipitation method,in which aluminum(III) was partially substituted by Europium (III) in the hydrotalcite-like layers,and thenoyltrifluoroacetone,1,10-phenanthroline were dispersed into the anions in the interlayer region.The sample was characterized by XRD,XPS,FT-IR,ICP,TG-DSC,TEM and fluorescence spectra,and its composition and structure were determined.The results indicated that the sample exhibited a characteristic red light (614 nm).The fluorescent lifetime and fluorescence quantum yield of Eu-HTlc were measured to be respectively 893 -s and 66.44%,higher than those of Eu(III)-thenoyltrifluoroacetone1,10-phenanthroline complex [Eu(TTA)3phen].The result of TG-DSC measurement showed the enhanced thermal stability of Eu-HTlc compared with that of MgAl-LDHs and Eu(TTA)3phen.With excellent photoluminescent property and thermal stability,low contents of rare earth ions and ligands,the Eu-HTlc may become one of the novel fluorescent materials with potential applications. 展开更多
关键词 hydrotalcite-like compound EUROPIUM fluorescence INTERCALATION SUPRAMOLECULE
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Removal of Cu(Ⅱ) from CuSO4 Aqueous Solution by Mg-Al Hydrotalcite-like Compounds 被引量:4
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作者 臧运波 侯万国 徐洁 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2011年第4期847-852,共6页
Hydrotalcite-like compound (HTlc) with a Mg/AI molar ratio of 2 : 1 was synthesized by using a coprecipitation method and the sorption removal of Cu(Ⅱ) by the Mg-AI HTlc sample from CuSO4 solution was investigat... Hydrotalcite-like compound (HTlc) with a Mg/AI molar ratio of 2 : 1 was synthesized by using a coprecipitation method and the sorption removal of Cu(Ⅱ) by the Mg-AI HTlc sample from CuSO4 solution was investigated. It was found that the Mg-AI HTlc showed a good sorption ability for Cu(Ⅱ) from CuSO4 solution, indicating that the use of hydrotalcite-like compounds as promising inorganic sorbents for the removal of heavy metal ions from water is possible. The sorption kinetics and the sorption isotherm of Cu(Ⅱ) on the HTlc obeyed the pseudo-second order kinetic model and Langmuir equation, respectively. The percent removal of Cu(Ⅱ) by the HT1c was strongly dependent on the initial pH of bulk solution. It increased sharply with the increase of initial pH value in the range of 5-7, and was relatively small in the initial pH range of 4-5, while it reached about 100% after initial pH was higher than 7. The presence of AlCl3 might obviously lower the equilibrium sorption amount (qc) of Cu(Ⅱ) on the HTlc. However, the presences of NaCI and MgCl2 might increase the qe. The presences of ligands (citric acid and EDTA) in the studied concentration range might obviously decrease the qe of Cu(Ⅱ) on the HT1c. The removal mechanism of Cu(Ⅱ) cations by HTlc in the presence of SO4^2- anions may be attributed to the surface-induced precipitation of Cu(Ⅱ) hydroxides and the surface complex adsorption by the linking effect of SO4^2- between the HTlc and Cu(Ⅱ) cations, and the removal ability arising from the surface-induced precipitation is much higher than that from the linking effect of SO4^2-. 展开更多
关键词 ADSORPTION hydrotalcite-like compounds COPPER
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Thixotropy of Aqueous Suspensions Containing Mg-AI Hydrotalcite-like Compound and Low-substituted Cationic Starch: Comparison between Oscillatory Shear and Thixotropic Loop Measurements 被引量:1
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作者 Li, Yan Bi, Haoyu Shen, Shuanglong 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2011年第6期1101-1106,共6页
The rheological properties of aqueous suspensions consisting of positively charged aluminum magnesium hydrotalcite-like compound (HTlc) and low-substituted cationic starch (LCS) were investigated. Special emphasis... The rheological properties of aqueous suspensions consisting of positively charged aluminum magnesium hydrotalcite-like compound (HTlc) and low-substituted cationic starch (LCS) were investigated. Special emphasis was placed on the thixotropic phenomenon. Thixotropic behavior was investigated by two thixotropic methods: thixotropic loop and oscillatory shear measurements. LCS molecules could be adsorbed onto HTlc particles due to the hydrogen bonding between ether groups or hydroxyl groups of LCS and hydroxyl groups of HTlc. The elastic dynamic response of the HTlc/LCS suspension increased with increasing mass ratio (R) of HTlc and a three-dimensional network structure could be formed in the suspension with higher R value. The thixotropic type of the HTlc/LCS suspension transformed from negative to positive and then to complex thixotropy when R changed from 0 to 0.5. By comparing between the thixotropic results obtained by thixotropic loop and oscillatory shear measurements, it was validated that the thixotropic loop for the suspension showing complex thixotropy had a crossover point. 展开更多
关键词 COLLOIDS THIXOTROPY layered compounds hydrotalcite-like compounds low-substituted cationic starch
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Novel Co-Mg-Al-Ti-O catalyst derived from hydrotalcite-like compound for NO storage/decomposition 被引量:1
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作者 Jie Cheng Xiaoping Wang +1 位作者 Chunyan Ma Zhengping Hao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第3期488-493,共6页
Catalysts of Co1.5Mg1.5/Al0.9Ti0.1O and Co1.5Mg1.5/AlO were successfully prepared by calcinations of corresponding hydrotalcite-like compounds at 800°C for 4 hr. The derived oxides were of spinel phase and a smal... Catalysts of Co1.5Mg1.5/Al0.9Ti0.1O and Co1.5Mg1.5/AlO were successfully prepared by calcinations of corresponding hydrotalcite-like compounds at 800°C for 4 hr. The derived oxides were of spinel phase and a small quantity of Ti substitution did not change the crystal purity. Their catalytic performance for the NO storage/decomposition was investigated. Ti incorporation enhanced the NO decomposition activity while has an opposite effect on the storage capacity of catalyst. In situ FT-IR spectra of the catalysts showed that the final adsorption species on the catalysts was coordinated nitrates/nitrites. In addition, NO storage/decomposition mechanism has been discussed on the basis of these observations. 展开更多
关键词 NO decomposition STORAGE hydrotalcite-like compounds
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Synthesis of HTLcs modified by K_(3)PO_(4) for side chain alkylation of toluene with methanol 被引量:8
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作者 Chunyao Hao Yueli Wen +4 位作者 Bin Wang Faraz Ahmad Yuhua Liu Huijun Li Wei Huang 《Green Energy & Environment》 SCIE CSCD 2021年第6期961-967,共7页
A series of calcined HTLcs catalysts were prepared and modified with potassium phosphate by impregnation method to clarify the influence of catalyst alkalinity on the side chain alkylation of toluene with methanol for... A series of calcined HTLcs catalysts were prepared and modified with potassium phosphate by impregnation method to clarify the influence of catalyst alkalinity on the side chain alkylation of toluene with methanol for synthesis of ethylbenzene and styrene.The catalysts were characterized by X-ray diffraction(XRD),N_(2)physical adsorption-desorption,Fourier-transform infrared spectroscopy(FT-IR),Scanning electron microscopy(SEM),X-ray photoelectron spectrometry(XPS),NH_(3)temperature-programmed desorption(NH_(3)-TPD)and CO_(2)temperature-programmed desorption(CO_(2)-TPD).It was found that the selectivity of styrene was highest(39.25%)when the K_(3)PO_(4)loading was 7.5 wt%.And the total yield of styrene and ethylbenzene could reach 65.08%with 10 wt%K_(3)PO_(4)loading.This might due to the fact that the addition of K_(3)PO_(4)could adjust the acid and basic sites of catalysts.In addition,appropriate strength and amount of basic sites were favorable to producing more styrene. 展开更多
关键词 Toluene alkylation STYRENE hydrotalcite-like compounds(HTLcs) Potassium phosphate
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Effect of Ce-doping on catalysts derived from hydrotalcite-like precursors for COS hydrolysis 被引量:3
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作者 赵顺征 易红宏 +3 位作者 唐晓龙 宁平 王红妍 何丹 《Journal of Rare Earths》 SCIE EI CAS CSCD 2010年第S1期329-333,共5页
In order to investigate the effect of Ce-doping on the catalysts derived from hydrotalcite-like precursors for carbonyl sulfide(COS) hydrolysis,a series of Zn-Ni-Al-Ce hydrotalcite-like compounds were prepared by co-p... In order to investigate the effect of Ce-doping on the catalysts derived from hydrotalcite-like precursors for carbonyl sulfide(COS) hydrolysis,a series of Zn-Ni-Al-Ce hydrotalcite-like compounds were prepared by co-precipitation method and the catalytic activity of their derived composite oxides were studied at 50 oC.The effect on the structural properties caused by Ce doping was studied by the X-ray diffractometer(XRD),scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS).The catalytic activities results showed that addition of Ce enhanced the catalytic activities significantly,but excessive Ce-doping had a negative effect on COS hydrolysis.XRD,SEM and EDS results illustrated that,compared with the Ce-free sample,the particle size of oxide solids decreased and the degree of dispersion increased due to Ce doping. 展开更多
关键词 Ce-doping hydrotalcite-like compounds carbonyl sulfide HYDROLYSIS rare earths
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Improved methanol synthesis performance of Cu/ZnO/Al_(2)O_(3)catalyst by controlling its precursor structure 被引量:4
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作者 Fan Zhang Xiaoying Xu +4 位作者 Zhengpu Qiu Bo Feng Yuan Liu Aihua Xing Maohong Fan 《Green Energy & Environment》 SCIE EI CSCD 2022年第4期772-781,共10页
Methanol,a versatile chemical,fuel additive and potential H_(2) carrier,has attracted great attention.Despite of the wide industrialization,improvement of Cu-based methanol-synthesis catalysts is highly anticipated.Ac... Methanol,a versatile chemical,fuel additive and potential H_(2) carrier,has attracted great attention.Despite of the wide industrialization,improvement of Cu-based methanol-synthesis catalysts is highly anticipated.Accordingly,a series of Cu/ZnO/Al_(2)O_(3) with designed precursor structures were prepared,and its structure-function relationship was investigated to make progress on this area.Results showed the catalyst derived from highly zinc-substituted malachite demonstrated the best catalytic performance in this work.It was found that the well-behaved catalyst possessed relatively high Cu specific surface area and exposed Cu concentration,and the well Cu/ZnO synergy.CuZn alloy was found by In-situ XRD tests,and its effect on the catalyst's thermostability was discussed.Fractional precipitation,which facilitated the Cu^(2+) substitution by Zn^(2+) in malachite lattice,could be an efficient preparation method of the Cu/ZnO/Al_(2)O_(3) catalyst. 展开更多
关键词 Zinc malachite Cu^(2+)substitution hydrotalcite-like compounds Fractional precipitation In-situ XRD
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Urea Decomposition Method to Synthesize Hydrotalcites 被引量:1
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作者 PiaoPingYANG JianFengYU +4 位作者 TongHaoWU GuoZongLIU TaeSunCHANG DongKooLEE DeugHeeCHO 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第1期90-92,共3页
The urea decomposition property at high temperature has been used to control the pH value in the synthesis of layer compounds. The hydrotalcites of Mg-Al and Ni-Al with high crystallinity were synthesized by using th... The urea decomposition property at high temperature has been used to control the pH value in the synthesis of layer compounds. The hydrotalcites of Mg-Al and Ni-Al with high crystallinity were synthesized by using this property. 展开更多
关键词 hydrotalcite-like compound urea decomposition control of pH value.
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Catalytic reduction of NO_x by CO on hydro-talcites-derived mixed oxides Co AIM and MgAlM (M = Cr, Mn, Fe, Co, Ni, Cu) 被引量:1
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作者 刘钰 王学中 +1 位作者 杨向光 吴越 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1999年第6期599-608,4,共11页
Two series of mixed oxides, CoAlM and MgAlM (M= Cr, Mn, Fe, Co, Ni, Cu) , were prepared by calcining their corresponding hydrotalcite-like compounds (HTLc) . The ratio of Mg: Al: M (or Co: Al: M) was 3:1:1. The cataly... Two series of mixed oxides, CoAlM and MgAlM (M= Cr, Mn, Fe, Co, Ni, Cu) , were prepared by calcining their corresponding hydrotalcite-like compounds (HTLc) . The ratio of Mg: Al: M (or Co: Al: M) was 3:1:1. The catalytic activity of all samples for the reaction of NO + CO was investigated. The results showed that the activity of CoAlM was much higher than that of MgAlM. The structure and the property of redox were characterized by XRD and H2-TPR. The results indicated that only MgO phase was observed after calcining MgAlM hydrotalcites, and the transition metals became more stable. The spinel-like phase appeared in all of CoAlM samples after the calcination, and the transition metals were changed to be more active, and easily reduced . The activities of three series of mixed oxides CoAlCu obtained from different preparation methods, different ratio of Co:Al:Cu and at different calcination temperatures, were studied in detail for proposing the mechanism of reaction. The ability of adsorption of NO and CO were investigated respectively for supporting the mecha- 展开更多
关键词 hydrotalcite-like compounds NO reduction by CO mixed oxides MgAlM and CoAlM transition metals
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