期刊文献+
共找到35篇文章
< 1 2 >
每页显示 20 50 100
Synthesis of K-doped three-dimensionally ordered macroporous Mn_(0.5)Ce_(0.5)O_δ catalysts and their catalytic performance for soot oxidation 被引量:7
1
作者 于学华 赵震 +4 位作者 韦岳长 刘坚 李建梅 段爱军 姜桂元 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2015年第11期1957-1967,共11页
A series of K-doped Mn0.5Ce0.5Oδ (K-MCO) catalysts with three-dimensionally ordered macroporous (3DOM) structure and different K loadings were successfully synthesized using simple methods. These catalysts exhibi... A series of K-doped Mn0.5Ce0.5Oδ (K-MCO) catalysts with three-dimensionally ordered macroporous (3DOM) structure and different K loadings were successfully synthesized using simple methods. These catalysts exhibited well-defined 3DOM nanostructure, which consisted of extensive interconnecting networks of spherical voids. The effects of the calcination temperature and calcination time on the morphological characteristics and crystalline forms of the catalysts were systematically studied. The catalysts showed high catalytic activity for the combustion of soot. 3DOM 20% K-MCO-4h catalyst, in particular, showed the highest catalytic activity of all of the catalysts studied (e.g., Ts0 = 331 ~C and Smco2 = 95.3%). The occurrence of structural and synergistic effects among the K, Mn, and Ce atoms in the catalysts was favorable for enhancing their catalytic activity towards the combustion of diesel soot. Furthermore, the temperatures required for the complete combustion of the soot (〈400 ℃) were well within the exhaust temperature range (175-400 ℃), which means that the accumulated soot can be removed under the conditions of the diesel exhaust gas. These catalysts could therefore be used in numerous practical applications because they are easy to synthesize, exhibit high catalytic activity, and can be made from low cost materials. 展开更多
关键词 three-dimensionally ordered macroporous structureMn0.5Ce0.5Oδ catalystPotassuim dopingSoot combustion
下载PDF
Three-dimensionally Ordered Macroporous Phosphotungstic Acid/SiO2 for Efficient Catalytic Oxidative Desulfurization 被引量:3
2
作者 杜岳 YANG Peng +3 位作者 雷家珩 ZHOU Shiyu LI Junsheng DU Xiaodi 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第4期849-854,共6页
Three-dimensionally ordered(3DOM) macroporous phosphotungstic acid/SiO_2(HPW/SiO_2) materials were prepared by using colloidal crystal as templates and applied for oxidative desulfurization(ODS) of the model fue... Three-dimensionally ordered(3DOM) macroporous phosphotungstic acid/SiO_2(HPW/SiO_2) materials were prepared by using colloidal crystal as templates and applied for oxidative desulfurization(ODS) of the model fuel oil. The obtained HPW/SiO_2 materials were characterized through scanning electron microscopy, powder X-ray diffraction, N_2 sorption, and Fourier transform infrared spectroscopy. The results indicated that 3 DOM HPW/SiO_2 possessed hierarchical pore architectures which contained ordered macropores and disordered mesopores, with the Keggin type HPW embedded in the framework of pore structure. The removal rate of dibenzothiophene(DBT) could reach 100% under the optimum conditions, moreover. The performance was only slightly decreased for the regenerated catalyst after 7 cycles. 展开更多
关键词 three-dimensionally ordered macroporous SiO2 phosphotungstic acid oxidativedesulfurization
下载PDF
Three-dimensionally ordered macroporous cross-linked polystyrene incorporating functional group via hydrophilic spacer arm 被引量:1
3
作者 Li Xia Yuan Xiao Mei Wang Xu Zhang Pan Ge Liu Wei Dong Yan 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第12期1493-1496,共4页
A versatile and effective method for incorporating functional groups on the pore wall of three-dimensionally ordered macroporous cross-linked polystyrene(3DOM CLPS) by hydrophilic spacer arm has been investigated.Th... A versatile and effective method for incorporating functional groups on the pore wall of three-dimensionally ordered macroporous cross-linked polystyrene(3DOM CLPS) by hydrophilic spacer arm has been investigated.The 3DOM CLPS with pore size 865 nm was prepared by sacrifice template method.The hydrophilic spacer arm(polyethylene glycol,molecular weight is 600) was grafted to the 3DOM CLPS via nucleophilic substitution reaction.The other side of active hydroxyl can be further converted into a lot of other functional groups.In this report,the chelating ligand 2-mercaptobenzothiazole(MBZ) group was introduced on the end of the PGE chain to evidence the versatile functionalization approach.The functionalized ordered macroporous materials were characterized by FT-IR,element analyzer,SEM.The results reveal that the pores were successfully bonded with 2-mercaptobenzothiazole groups via hydrophilic spacer arms and the original morphology of ordered macroporous materials were remained after functionalization.The MBZ group density is 0.052 mmol/m^2.The functionalized 3DOM CLPS are expected to application as heavy metal ions adsorbent. 展开更多
关键词 three-dimensionally ordered macroporous polymer FUNCTIONALIZATION Hydrophilic space arm Heterocyclic functional group
下载PDF
Pore-filling Three-dimensionally Ordered Macroporous Polyimide Composite Proton Conducting Membranes
4
作者 DAI Xin GENG Lei +2 位作者 LIU Dan LU Chang-li YANG Bai 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2011年第5期896-899,共4页
The silica opal templates were prepared from three silica colloids of different diameters of 230 nm, 500 nm and 1.5 mm by a filtration route. The large-scale stable opal template membranes after sintering the deposite... The silica opal templates were prepared from three silica colloids of different diameters of 230 nm, 500 nm and 1.5 mm by a filtration route. The large-scale stable opal template membranes after sintering the deposited SiO2 opal template can be successfully obtained by optimizing the pH value and NaCl concentration in silica colloidal solutions. The three-dimensionally ordered macroporous(3DOM) polyimide membranes without crack were fabricated by reproducing the structure of silica opal template. We prepared the pore-filling composite proton exchange membranes by filling the 3DOM structure with proton conducting organosilane sol. The result indicates that the composite membranes exhibit higher water uptake than pure filling organosilane gel. The proton conductivity increased with the increasing of pore cell in composite membranes. 展开更多
关键词 three-dimensionally ordered macroporous(3DOM) Pore-filling Proton conducting membrane Polymercomposite material
下载PDF
Three-dimensional ordered macroporous perovskite-type La_(1-x)K_xNiO_3 catalysts with enhanced catalytic activity for soot combustion: the Effect of K-substitution 被引量:8
5
作者 Xuelei Mei Jing Xiong +4 位作者 Yuechang Wei Chujun Wang Qiangqiang Wu Zhen Zhao Jian Liu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第5期722-732,共11页
Three-dimensional ordered macroporous (3DOM) La1?xKxNiO3 perovskite-type catalysts were successfully prepared by a colloidal crystal template method and characterized by scanning electron microscopy, transmission elec... Three-dimensional ordered macroporous (3DOM) La1?xKxNiO3 perovskite-type catalysts were successfully prepared by a colloidal crystal template method and characterized by scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray scattering elemental mapping, X-ray diffraction, Raman and X-ray photoelectron spectroscopy, and temperature-programmed reduction of H2. Further, their catalytic activity in soot combustion was determined by temperature-programmed oxidation reaction. K substitution into the LaNiO3 lattice led to remarkably improved catalytic activity of this catalyst in soot combustion. Amongst various catalysts, La0.95K0.05NiO3 exhibited the highest activity in soot combustion (with its T50 and CO2 S values being 338 °C and 98.2%, respectively), which is comparable to the catalytic activities of Pt-based catalysts under the condition of poor contact between the soot and the catalyst. K-substitution improves the valence state of Ni and increases the number of oxygen vacancies, thereby leading to increased density of surface-active oxygen species. The active oxygen species play a vital role in catalyzing the elimination of soot. The perovskite-type La1?xKxNiO3 nanocatalysts with 3DOM structure without noble metals have potential for practical applications in the catalytic combustion of diesel soot particles. 展开更多
关键词 three-dimensional ordered macroporous material LANIO3 Potassium Perovskite Soot combustion
下载PDF
Ultrasmall NiS_(2)Nanocrystals Embedded in Ordered Macroporous Graphenic Carbon Matrix for Efficiently Pseudocapacitive Sodium Storage 被引量:1
6
作者 Zhaozhao Liu Jiang Wang +7 位作者 Ran Bi Pinyi Zhao Mengqian Wu Xinyu Liu Likun Yin Chengyang Wang Mingming Chen Kemeng Ji 《Transactions of Tianjin University》 EI CAS 2023年第2期89-100,共12页
Sodium-ion hybrid capacitor(SIHC)is one of the most promising alternatives for large-scale energy storage due to its high energy and power densities,natural abundance,and low cost.However,overcoming the imbalance betw... Sodium-ion hybrid capacitor(SIHC)is one of the most promising alternatives for large-scale energy storage due to its high energy and power densities,natural abundance,and low cost.However,overcoming the imbalance between slow Na^(+)reaction kinetics of battery-type anodes and rapid ion adsorption/desorption of capacitive cathodes is a significant challenge.Here,we propose the high-rate-performance NiS_(2)@OMGC anode material composed of monodispersed NiS_(2) nanocrystals(8.8±1.7 nm in size)and N,S-co-doped graphenic carbon(GC).The NiS_(2)@OMGC material has a three-dimensionally ordered macroporous(3DOM)morphology,and numerous NiS_(2) nanocrystals are uniformly embedded in GC,forming a core-shell structure in the local area.Ultrafine NiS_(2) nanocrystals and their nano-microstructure demonstrate high pseudocapacitive Na-storage capability and thus excellent rate performance(355.7 mAh/g at 20.0 A/g).A SIHC device fabricated using NiS_(2)@OMGC and commercial activated carbon(AC)cathode exhibits ultrahigh energy densities(197.4 Wh/kg at 398.8 W/kg)and power densities(43.9 kW/kg at 41.3 Wh/kg),together with a long life span.This outcome exemplifies the rational architecture and composition design of this type of anode material.This strategy can be extended to the design and synthesis of a wide range of high-performance electrode materials for energy storage applications. 展开更多
关键词 Sodium-ion battery Sodium-ion hybrid capacitor three-dimensionally ordered macroporous structure Graphenic carbon NiS_(2)nanocrystals
下载PDF
Synergistically boosting the elementary reactions over multiheterogeneous ordered macroporous Mo2C/NC-Ru for highly efficient alkaline hydrogen evolution 被引量:6
7
作者 Kaixi Wang Shuo Wang +7 位作者 Kwan San Hui Haixing Gao Duc Anh Dinh Chengzong Yuan Chenyang Zha Zongping Shao Zikang Tang Kwun Nam Hui 《Carbon Energy》 SCIE CAS 2022年第5期856-866,共11页
Simultaneously enhancing the reaction kinetics,mass transport,and gas release during alkaline hydrogen evolution reaction(HER)is critical to minimizing the reaction polarization resistance,but remains a big challenge.... Simultaneously enhancing the reaction kinetics,mass transport,and gas release during alkaline hydrogen evolution reaction(HER)is critical to minimizing the reaction polarization resistance,but remains a big challenge.Through rational design of a hierarchical multiheterogeneous three-dimensionally(3D)ordered macroporous Mo_(2)C-embedded nitrogen-doped carbon with ultrafine Ru nanoclusters anchored on its surface(OMS Mo_(2)C/NC-Ru),we realize both electronic and morphologic engineering of the catalyst to maximize the electrocatalysis performance.The formed Ru-NC heterostructure shows regulative electronic states and optimized adsorption energy with the intermediate H*,and the Mo_(2)C-NC heterostructure accelerates the Volmer reaction due to the strong water dissociation ability as confirmed by theoretical calculations.Consequently,superior HER activity in alkaline solution with an extremely low overpotential of 15.5 mV at 10 mAcm^(−2)with the mass activity more than 17 times higher than that of the benchmark Pt/C,an ultrasmall Tafel slope of 22.7 mV dec−1,and excellent electrocatalytic durability were achieved,attributing to the enhanced mass transport and favorable gas release process endowed from the unique OMS Mo_(2)C/NC-Ru structure.By oxidizing OMS Mo_(2)C/NC-Ru into OMS MoO_(3)-RuO_(2)catalyst,it can also be applied as efficient oxygen evolution electrocatalyst,enabling the construction of a quasi-symmetric electrolyzer for overall water splitting.Such a device's performance surpassed the state-of-the-art Pt/C||RuO2 electrolyzer.This study provides instructive guidance for designing 3D-ordered macroporous multicomponent catalysts for efficient catalytic applications. 展开更多
关键词 HETEROstructure hydrogen evolution reaction molybdenum carbide ordered macroporous structure ruthenium nanoparticle synergistic effect
下载PDF
Synthesis of three-dimensional ordered mesoporous MnO_2 and its catalytic performance in formaldehyde oxidation 被引量:20
8
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27-31,共5页
Three-dimensional(3D)ordered mesoporous MnO2 was prepared using KIT-6 mesoporous molecular sieves as a hard template.The material was used for catalytic oxidation of HCHO.The material has high surface areas and the ... Three-dimensional(3D)ordered mesoporous MnO2 was prepared using KIT-6 mesoporous molecular sieves as a hard template.The material was used for catalytic oxidation of HCHO.The material has high surface areas and the mesoporous characteristics of the template,with cubic symmetry(ia3d).It consists of a β-MnO2 crystalline phase corresponding to pyrolusite,with a rutile structure.Transmission electron microscopy and X-ray photoelectron spectroscopy showed that the 3D-MnO2 catalyst has a large number of exposed Mn4+ ions on the(110)crystal plane surfaces,with a lattice spacing of 0.311 nm; this enhances oxidation of HCHO.Complete conversion of HCHO to CO2 and H2O was achieved at 130 °C on 3D-MnO2; the same conversions on α-MnO2 and β-MnO2 nanorods were obtained at 140 and 180 °C,respectively,under the same conditions.The specific mesoporous structure,high specific surface area,and large number of surface Mn4+ ions are responsible for the catalytic activity of 3D-MnO2 in HCHO oxidation. 展开更多
关键词 three-dimensional ordered material Mesoporous structure Manganese oxide FORMALDEHYDE Catalytic oxidation
下载PDF
A novel adsorbent of three-dimensional ordered macro/mesoporous carbon for removal of malachite green dye 被引量:5
9
作者 WAGN Jie HOU Guang-ya +3 位作者 WU Lian-kui CAO Hua-zhen ZHENG Guo-qu TANG Yi-ping 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第2期388-402,共15页
Three-dimensional ordered macro/mesoporous carbon(3DOM/m-C)with high specific surface area was synthesized by colloid crystal template method with chemical activation by KOH and used as the adsorbent for removing mala... Three-dimensional ordered macro/mesoporous carbon(3DOM/m-C)with high specific surface area was synthesized by colloid crystal template method with chemical activation by KOH and used as the adsorbent for removing malachite green(MG)in aqueous solution.The microstructures of the adsorbents were characterized by FESEM,TEM and BET,and the effects of initial dye concentration,contact time,solution pH,and temperature on adsorption performance were investigated.The results show that the 3DOM/m-C exhibits extremely high adsorption capacity of 3541.1 mg/g within 2 h,which could be attributed to the novel ordered hierarchical structure with mesopores on three-dimensional ordered macroporous carbon walls.And the adsorption behavior conforms to the pseudo-second-order kinetic and Langmuir adsorption isotherm.3DOM/m-C can be recycled after being desorbed by absolute ethanol,and still maintains a high capacity of 2762.06 mg/g after 5 cycles. 展开更多
关键词 malachite green adsorption three-dimensional ordered macroporous MESOPOROUS thermodynamics kinetics DESORPTION
下载PDF
Enhanced photocatalytic performance of Bi_(4)O_(5)Br_(2)with threedimensionally ordered macroporous structure for phenol removal 被引量:1
10
作者 Kunfeng Zhang Hongxia Chen +3 位作者 Wenbo Pei Hongxing Dai Junshan Li Yongfa Zhu 《Nano Research》 SCIE EI CSCD 2023年第7期8871-8881,共11页
Herein,a series of three-dimensionally ordered macroporous(3DOM)Bi_(4)O_(5)Br_(2)photocatalysts with different macropore sizes were successfully fabricated via a polymethyl methacrylate(PMMA)template method.The photoc... Herein,a series of three-dimensionally ordered macroporous(3DOM)Bi_(4)O_(5)Br_(2)photocatalysts with different macropore sizes were successfully fabricated via a polymethyl methacrylate(PMMA)template method.The photocatalytic activity for phenol degradation over 3DOM Bi_(4)O_(5)Br_(2)first increased and then decreased with the rise in macropore size.Specifically,3DOM Bi_(4)O_(5)Br_(2)-255(macropore diameter ca.170 nm)exhibits the best photocatalytic activity in the static system,which is about 4.5,7.3,and 11.9 times higher than those of bulk Bi_(4)O_(5)Br_(2),Bi_(2)WO_(6),and g-C_(3)N_(4),respectively.Meanwhile,high phenol conversion(75%)is also obtained over 3DOM Bi_(4)O_(5)Br_(2)-255 in the flow system under full spectrum irradiation.Furthermore,3DOM Bi_(4)O_(5)Br_(2)-255 also shows strong mineralization capacity owing to the downward shift of valance band position(0.15 V)as compared with Bi_(4)O_(5)Br_(2).Total organic carbon(TOC)removal rate over 3DOM Bi_(4)O_(5)Br_(2)-255(62%)is much higher than that of Bi_(4)O_(5)Br_(2)(17%).The enhancement in photocatalytic performance of 3DOM Bi_(4)O_(5)Br_(2)-255 is attributable to its better phenol adsorption,O_(2)activation,and charge separation and transfer abilities.This work combines the advantages of 3D structure and surface dangling bonds,providing new possibilities for designing highly efficient photocatalysts for pollutants removal. 展开更多
关键词 three-dimensionally ordered macroporous structure Bi_(4)O_(5)Br_(2) O_(2)activation PHOTOCATALYSIS degradation
原文传递
Three‑Dimensional Ordered Mesoporous Carbon Spheres Modified with Ultrafine Zinc Oxide Nanoparticles for Enhanced Microwave Absorption Properties 被引量:11
11
作者 Yan Song Fuxing Yin +3 位作者 Chengwei Zhang Weibing Guo Liying Han Ye Yuan 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第5期61-76,共16页
Currently,electromagnetic radiation and interference have a significant effect on the operation of electronic devices and human health systems.Thus,developing excellent microwave absorbers have a huge significance in ... Currently,electromagnetic radiation and interference have a significant effect on the operation of electronic devices and human health systems.Thus,developing excellent microwave absorbers have a huge significance in the material research field.Herein,a kind of ultrafine zinc oxide(ZnO)nanoparticles(NPs)supported on three-dimensional(3D)ordered mesoporous carbon spheres(ZnO/OMCS)is prepared from silica inverse opal by using phenolic resol precursor as carbon source.The prepared lightweight ZnO/OMCS nanocomposites exhibit 3D ordered carbon sphere array and highly dispersed ultrafine ZnO NPs on the mesoporous cell walls of carbon spheres.ZnO/OMCS-30 shows microwave absorbing ability with a strong absorption(−39.3 dB at 10.4 GHz with a small thickness of 2 mm)and a broad effective absorption bandwidth(9.1 GHz).The outstanding microwave absorbing ability benefits to the well-dispersed ultrafine ZnO NPs and the 3D ordered mesoporous carbon spheres structure.This work opened up a unique way for developing lightweight and high-efficient carbon-based microwave absorbing materials. 展开更多
关键词 three-dimensional ordered structure Mesoporous carbon spheres Zinc oxide nanoparticles Microwave absorption
下载PDF
Superior performance in visible-light-driven hydrogen evolution reaction of three-dimensionally ordered macroporous SrTiO_(3) decorated with Zn_(x)Cd_(1−x)S 被引量:1
12
作者 Huiying Quan Kejiang Qian +3 位作者 Ying Xuan Lan-Lan Lou Kai Yu Shuangxi Liu 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2021年第6期1561-1571,共11页
It is of broad interest to develop emerging photocatalysts with excellent light-harvesting capacity and high charge carrier separation efficiency for visible light photocatalytic hydrogen evolution reaction.However,ac... It is of broad interest to develop emerging photocatalysts with excellent light-harvesting capacity and high charge carrier separation efficiency for visible light photocatalytic hydrogen evolution reaction.However,achieving satisfying hydrogen evolution efficiency under noble metal-free conditions remains challenging.In this study,we demonstrate the fabrication of three-dimensionally ordered macroporous SrTiO_(3)decorated with Zn_(x)Cd_(1−x)S nanoparticles for hydrogen production under visible light irradiation(λ>420 nm).Synergetic enhancement of photocatalytic activity is achieved by the slow photon effect and improved separation efficiency of photogenerated charge carriers.The obtained composites could afford very high hydrogen production efficiencies up to 19.67 mmol·g^(−1)·h^(−1),with an apparent quantum efficiency of 35.9%at 420 nm,which is 4.2 and 23.9 times higher than those of pure Zn_(0.5)Cd_(0.5)S(4.67 mmol·g^(−1)·h^(−1))and CdS(0.82 mmol·g^(−1)·h^(−1)),respectively.In particular,under Pt-free conditions,an attractive hydrogen production rate(3.23 mmol·g^(−1)·h^(−1))was achieved,providing a low-cost and high-efficiency strategy to produce hydrogen from water splitting.Moreover,the composites showed excellent stability,and no obvious loss in activity was observed after five cycling tests. 展开更多
关键词 three-dimensionally ordered macroporous SrTiO_(3) Zn_(x)Cd_(1−x)S visible light hydrogen production promotion mechanism
原文传递
Preparation of the glucose sensor based on three-dimensional ordered macroporous gold film and room temperature ionic liquid 被引量:3
13
作者 CHEN XiaoJun XUAN Jie +1 位作者 JIANG LiPing ZHU JunJie 《Science China Chemistry》 SCIE EI CAS 2009年第11期1999-2005,共7页
A novel type of glucose sensor was fabricated based on a glucose oxidase(GOD)-N,N-dimethtylformamide(DMF)-[BMIm][BF4] composites modified three-dimensional ordered macroporous(3DOM) gold film electrode.The immobilized... A novel type of glucose sensor was fabricated based on a glucose oxidase(GOD)-N,N-dimethtylformamide(DMF)-[BMIm][BF4] composites modified three-dimensional ordered macroporous(3DOM) gold film electrode.The immobilized GOD exhibits a pair of well-defined reversible peaks in 50 mM pH 7.0 phosphate buffer solutions(PBS),which could be attributed to the redox of flavin adenine dinucleotide(FAD) in GOD.The research results show that ionic liquid([BMIm][BF4]),DMF and 3DOM gold film are crucial for GOD to exhibit a pair of stable and reversible peaks.It is believed that the large active area of 3DOM gold film can increase the amount of immobilized GOD.Simultaneously,the application of IL enhances the stability of GOD and facilitates the electron transfer between GOD and the electrode.The synergetic effect of DMF can help the GOD to maintain its bioactivity better.GOD immobilized on the electrode exhibits the favorable electrocatalytic property to glucose,and the prepared sensor has a linear range from 10 to 125 nM with a detection limit of 3.3 nM at a signal-to-noise ratio of 3σ.The apparent Km(Michaelis-Menten constant) for the enzymatic reaction is 0.018 mM. 展开更多
关键词 IONIC liquid glucose OXIDASE three-dimensionAL ordered macroporous gold film direct ELECTROCHEMISTRY electrochemical catalysis
原文传递
Color tunable upconversion emission in CeO_2:Yb,Er three-dimensional ordered macroporous materials 被引量:1
14
作者 程彦敏 杨正文 +3 位作者 廖佳燕 邱建备 宋志国 杨勇 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第6期599-603,共5页
The three-dimensional ordered macroporous CeO2:Yb,Er materials were prepared, and the influence of doping concentra- tion of Yb3+ or Er3+ ions on upconversion property was investigated. Green and red upconversion e... The three-dimensional ordered macroporous CeO2:Yb,Er materials were prepared, and the influence of doping concentra- tion of Yb3+ or Er3+ ions on upconversion property was investigated. Green and red upconversion emissions were observed under the excitation of 980 nm at room temperature. It was found that the ratio of red to green upconversion emission intensity increased with increasing of concentration of the Yb3+ or Er3+ ions in the three-dimensional ordered macroporous CeO2:Yb,Er materials. When the concentration of Yb3+ was 10 mol%, pure red upconversion emission was obtained. The varied mechanism of ratio of red to green upconversion emission intensity was discussed with the concentration of Yb3+ or Er3+ ions. 展开更多
关键词 three-dimensional ordered macroporous materials CeO2:Yb Er upconversion emission color tunability rare earths
原文传递
Synthesis of 3D ordered macroporous indium tin oxide using polymer colloidal crystal template 被引量:2
15
作者 ZHANG Xue'ao MAN Yahui WANG Jianfang LIU Changli WU Wenjian 《Science China(Technological Sciences)》 SCIE EI CAS 2006年第5期537-546,共10页
Three-dimensional (3D) ordered macroporous indium tin oxide (ITO) is pre- pared using a polymer colloidal crystal template that is formed by self-assembly of the monodisperse poly(methyl methacrylate) (PMMA) microsphe... Three-dimensional (3D) ordered macroporous indium tin oxide (ITO) is pre- pared using a polymer colloidal crystal template that is formed by self-assembly of the monodisperse poly(methyl methacrylate) (PMMA) microspheres. The morphologies and BET surface area of the macroporous material is examined by scanning electron micro- scope, transmission electron microscopy and N2 adsorption/desorption. Results indicate that the macroporous material has highly ordered arrays of the uniform pores replicated from the PMMA colloidal crystal template when the polymer colloidal crystal template is removed by calcinations at 500℃. The pore diameter (about 450 nm) of macroporous ITO slightly shrank to the PMMA microspheres. The BET surface area and pore volume of the macroporous material are 389 m2·g-1 and 0.36 cm3·g-1, respectively. Moreover, the macroporous ITO, containing 5 mol% Sn and after annealing under vacuum, shows the minimum resistivity of ρ = 8.2×10-3 Ω· cm. The conductive mechanism of macroporous ITO is discussed, and it is believed that the oxygen vacancies are the major factor for excellent electrical properties. 展开更多
关键词 TEMPLATE synthesis POLYMER COLLOIDAL crystal INDIUM tin oxide three-dimensional order macroporous material.
原文传递
Immobilization of Glucose Oxidase on Ordered Macroporous Silicas Functionalized with Amino Group 被引量:2
16
作者 Wu,Quanzhou He,Jianfeng +1 位作者 Zhang,Jingjia Ou,Jiming 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2012年第2期283-287,共5页
A novel glucose oxidase immobilized on three-dimensionally ordered macroporous (3DOM) material has been prepared by firstly preparation of hybrid 3DOM SiO2-NH2 materials using colloidal crystal method, and following... A novel glucose oxidase immobilized on three-dimensionally ordered macroporous (3DOM) material has been prepared by firstly preparation of hybrid 3DOM SiO2-NH2 materials using colloidal crystal method, and following covalent immobilization of glucose oxidase on the pore walls of the 3DOM materials. The materials were characterized by SEM, FTIR, DSC and BET techniques. SEM observation shows that the macropores are highly ordered and are interconnected by small windows. FTIR measurement shows that there are amino and organic groups in the pore walls. The surface area of the 3DOM SiO2-NH2 material is about 10.2 m2/g. The loaded amount of enzyme is increased with amino content in the materials. The immobilized enzyme has high activity, thermal stability and can be reused. 展开更多
关键词 three-dimensionally ordered macropore SiO2 glucose oxidase supported catalyst materials science
原文传递
C9PR加氢催化剂孔道要求及其制备的研究进展
17
作者 王彩杰 《现代塑料加工应用》 CAS 北大核心 2024年第2期47-50,共4页
综述了适合于C9石油树脂(C9PR)加氢催化剂孔道结构的要求、孔道结构的制备及调节方法,并提出需加快对C9PR加氢催化剂孔道结构的研究。
关键词 碳九石油树脂 贯通有序大孔催化剂 孔径调节
下载PDF
Pt/Co_3O_4/3DOM Al_2O_3:Highly effective catalysts for toluene combustion 被引量:9
18
作者 杨黄根 邓积光 +3 位作者 刘雨溪 谢少华 徐鹏 戴洪兴 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第6期934-946,共13页
Three-dimensionally ordered macro-/mesoporous alumina(3DOM Al2O3)-supported cobalt oxide and platinum nanocatalysts(xPt/yCo3O4/3DOM Al2O3,Pt mass fraction(x%)= 0-1.4%,Co3O4 mass fraction(y%) = 0-9.2%) were pre... Three-dimensionally ordered macro-/mesoporous alumina(3DOM Al2O3)-supported cobalt oxide and platinum nanocatalysts(xPt/yCo3O4/3DOM Al2O3,Pt mass fraction(x%)= 0-1.4%,Co3O4 mass fraction(y%) = 0-9.2%) were prepared using poly(methyl methacrylate) templating,incipient wetness impregnation and polyvinyl alcohol-protected reduction.The resulting xPt/yCo3O4/3DOM Al2O3 samples displayed a high-quality 3DOM architecture with macropores(180-200 nm in diameter) and mesopores(4-6 nm in diameter) together with surface areas in the range of 94 to 102m^2/g.Using these techniques,Co3O4 nanoparticles(NPs,18.3 nm) were loaded on the 3DOM Al2O3 surface,after which Pt NPs(2.3-2.5 nm) were uniformly dispersed on theyCo3O4/3DOM Al2O3.The1.3Pt/8.9Co3O4/3DOM Al2O3 exhibited the best performance for toluene oxidation,with a T(90%) value(the temperature required to achieve 90%toluene conversion) of 160 ℃ at a space velocity of20000 mL g^(-1) h^(-1).It is concluded that the excellent catalytic performance of the 1.3Pt/8.9Co3O4/3DOM Al2O3 is owing to well-dispersed Pt NPs,the high concentration of adsorbed oxygen species,good low-temperature reducibility,and strong interaction between the Pt and Co3O4 NPs,as well as the unique bimodal porous structure of the support. 展开更多
关键词 three-dimensionally ordered macropore Alumina-supported cobalt oxide catalyst Supported platinum catalyst Toluene combustion
下载PDF
四方排列有序Ag/TiO_2空心微球的制备及光催化性能 被引量:3
19
作者 刘玮洁 孙正昊 +1 位作者 邹博 崔海宁 《功能材料》 EI CAS CSCD 北大核心 2012年第7期915-918,共4页
采用低温垂直沉积法制备了聚苯乙烯(PS)胶体模板,由于低温下粒子热运动受到抑制,排列时发生位错,因此模板中存在大面积四方排列结构。然后采用化学镀法、溶胶-凝胶法在PS微球表面依次沉积银纳米粒子、纳米TiO2,最后高温煅烧除去模板制... 采用低温垂直沉积法制备了聚苯乙烯(PS)胶体模板,由于低温下粒子热运动受到抑制,排列时发生位错,因此模板中存在大面积四方排列结构。然后采用化学镀法、溶胶-凝胶法在PS微球表面依次沉积银纳米粒子、纳米TiO2,最后高温煅烧除去模板制备了四方排列有序Ag/TiO2空心微球。通过扫描电镜(SEM)、X射线衍射(XRD)对样品进行表征。结果表明这种材料很好地保持了模板的四方排列,具有高度有序的纳米结构。选择降解甲基橙溶液来检验样品的光催化性能,并与纳米TiO2薄膜、四方排列TiO2空心微球的光催化性能进行比较,结果表明四方排列Ag/TiO2空心微球具有最佳的光催化性能。这是有序空心纳米结构和银纳米粒子的沉积共同作用的结果。 展开更多
关键词 四方排列 纳米TIO2 光催化 有序结构 大孔材料
下载PDF
三维有序大孔负载Pt-SO_4^(2-)/TiO_2固体超强酸的制备和性能 被引量:2
20
作者 常桥稳 晏彩先 +4 位作者 姜婧 叶青松 余娟 刘伟平 陈家林 《材料导报》 EI CAS CSCD 北大核心 2014年第2期91-95,共5页
以一种直径约170nm的PMMA微球胶体晶体为模板,复制出孔径约为95nm的三维有序大孔SiO2,以这种大孔结构为载体,采用浸渍-焙烧法制备了三维有序大孔负载的Pt-SO42-/TiO2固体超强酸催化剂。探讨了TiO2负载量对三维有序大孔结构的影响。采用... 以一种直径约170nm的PMMA微球胶体晶体为模板,复制出孔径约为95nm的三维有序大孔SiO2,以这种大孔结构为载体,采用浸渍-焙烧法制备了三维有序大孔负载的Pt-SO42-/TiO2固体超强酸催化剂。探讨了TiO2负载量对三维有序大孔结构的影响。采用SEM、XRD、N2吸附-脱附实验对其大孔结构进行了表征。结果表明,适宜的TiO2负载量为30%(质量分数),太低,酸性不强,太高,易产生大孔的堵塞。负载后的大孔孔径约为75nm,呈现一种厚壁的球形大孔结构。与通常的三维有序大孔材料(孔径大于300nm)相比,这种孔径小化的大孔材料具有稳定性高和表面积大的特征。以乙酸和正丁醇的液相酯化反应为探针反应,发现这种大孔固体超强酸催化剂可以明显提高其催化活性。 展开更多
关键词 固体超强酸 三维有序大孔结构 负载 Pt-SO42- TiO2 酯化反应
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部