章福祥
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- 姓名:章福祥
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物理化学
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章福祥,男,汉族,1977年生于江西省崇仁县。1999和2004年分别获南开大学本科、博士学位。2004年7月留校任教,讲授《环境催化》课程,2005年破格晋升为副教授,硕士生导师。于2005,2007年分别访问德国柏林应化所和巴黎第六大学(博士后)。
现正承担国家自然科学基金,霍英东青年基金和企业合作基金等项目,主要参与科技部重大国际合作项目,973项目和国家自然科学基金重点项目等。发表论文40余篇,其中SCI收录论文30篇,获国家专利4项。2005年获天津市自然科学奖二等奖。
目前主要研究兴趣为新结构可见光催化剂、纳米氧化物催化剂、负载型金属催化剂和分子筛等催化材料合成及其在基本精细化工有机物的合成和在空气、水中特殊污染物催化净化等应用研究。如:汽车尾气的NOx气体净化、水中有机物和硝酸盐的催化净化。提出了利用光催化方法控制半导体表面负载金属的尺寸和形貌的原创思路,并首次建立了负载金属尺寸对水中硝酸盐催化转化活性和选择性的构效关系。
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589
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成果数
10
【期刊论文】Control of Morphology of Silver Clusters Coated on Titanium Dioxide during Photocatalysis
章福祥, Fuxiang Zhang, Naijia Guan, Yuzhuo Li, Xiu Zhang, Jixin Chen, and Haisheng Zeng
Langmuir 2003, 19, 8230-8234,-0001,():
-1年11月30日
Supported metal catalysts have been used extensively in many current industrial processes. The morphology of coated metal on a support is usually an important factor affecting the efficiency of the catalyst. In this study, the investigation is focused on a photocatalytic process to coat silver clusters on titania (P-25 TiO2) with an emphasis on the morphology control of coated silver clusters. For the first time, the particle size and the deployment intervals of silver clusters are controlled with an innovative method that involves the in-situ formation of water-insoluble transitory species such as AgBr, AgCl, or Ag2O on the surface of titanium dioxide. Experimental results demonstrated that the transitory particles function as physical spacers, which temporarily occupy some of the active site on the titanium dioxide surface and act as reservoirs for Ag+ ions to keep the local Ag+ concentration on TiO2 extremely low. The silver clusters coated on titania are found to be stable in the spherical silver-3c syn crystalline form indicated by TEM, XRD, and XPS measurements.
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【期刊论文】Simple and low-cost preparation method for highly dispersed Pd/TiO2 catalysts
章福祥, Fuxiang Zhang, Jixin Chen, Xiu Zhang, Wenliang Gao, Ruicai Jin, Naijia Guan
Catalysis Today 93–95 (2004) 645–650,-0001,():
-1年11月30日
tal particles coated on support has been proven to affect the performance of catalysts greatly. In this study, a simple photodeposition process will be introduced to coat palladium onto titanium dioxide with an emphasis on the morphology control and size distribution of palladium particles. The effect of pH on the morphology of palladium particles was systemically investigated. It is found that the deposited palladium particles can be controlled to have narrow particle size distribution and homogeneous dispersion by a simple pH-controlled process during photodeposition. Experimental results demonstrate that the adsorption competition between OH− and PdCl42− or it’s hydrolytic anions can efficiently keep local concentration of palladium ions on titanium dioxide extremely low to control the morphology of deposited palladium particles on titania. The as-prepared Pd/TiO2 particles are found to be crystallitic stable indicated by TEM, XRD and XPS measurements.
Palladium particles, Titania, Coating, Photodeposition, Morphology
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章福祥, Fuxiang Zhang, Jixin Chen, Xiu Zhang, Wenliang Gao, Ruicai Jin, Naijia Guan, and Yuzhuo Li
Langmuir 2004, 20, 9329-9334,-0001,():
-1年11月30日
Solid-supported metal catalysts have been widely used in industrial processes. The morphology of coated metal on the support is usually an important factor affecting the efficiency of the catalyst. In this study, a photocatalytic process is utilized to control the morphology of platinum particles deposited on titania (Degussa P-25). More specifically, the effect of pH on the morphology and the valence state of platinum nanoparticles was systemically investigated. It is found that, via a simple pH-controlled process, various states of platinum (Pt0, PtIIO, or PtIVO2) can be deposited onto the support directly at will. In this paper, the mechanism of morphology control and the key influencing factors at different pH regimes will be discussed. Followed by photodeposition, a H2 thermal treatment process was employed to convert the oxides into metal platinum with narrow size distribution and even coverage on the supporting titania. Various techniques such as transmission electron microscopy, high-resolution transmission electron microscopy, energy-dispersive analysis of X-rays, and X-ray photoelectron spectroscopy were employed to characterize the prepared titania-supported platinum particles.
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章福祥, Fuxiang Zhang, Ruicai Jin, Jixin Chen, Changzhun Shao, Wenliang Gao, Landong Li, Naijia Guan
Journal of Catalysis 232 (2005) 424–431,-0001,():
-1年11月30日
Ag/TiO2 catalyst with fine size and homogeneous dispersion of coated silver clusters was synthesized by a recently developed pHcontrolled photocatalytic process and applied to the photocatalytic reduction of nitrate as an environmentally friendly and low-cost catalyst with formic acid as a hole scavenger. Compared with conventional preparation routes, the as-prepared Ag/TiO2 catalyst in this study shows better catalytic performance: a nitrate conversion of 98% and selectivity for nitrogen of ca. 100%, which can be achieved after 30 min of irradiation. The average activity was calculated to be ca. 24 mmolNO3− g−1 Ag min−1, which is much higher than that of most of Pd–Cubased nitrate hydrogenation systems in terms of metal usage, demonstrating its application potential. A similar photocatalytic efficiency and selectivity for nitrogen were also observed for nitrite photocatalytic reduction on this catalyst. The effects of Ag content, hole scavengers, concentration of formic acid, and other anions present in drinking water, such as SO4 2−, CO3 2−, and HCO3−, were systematically investigated.
Silver clusters, Titania, Photocatalysis, Nitrate, Nitrite, Formic acid, Drinking water
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【期刊论文】Direct synthesis of zeolite coatings on cordierite supports by in situ hydrothermal method
章福祥, Landong Li, Bin Xue, Jixin Chen, Naijia Guan, Fuxiang Zhang, Dexin Liu, Hongqing Feng
Applied Catalysis A: General 292 (2005) 312–321,-0001,():
-1年11月30日
A simple and green in situ hydrothermal method, free of organic templates or zeolite seeds, was examined and introduced by depositing several typical microporous aluminosilicate zeolites (Linde A, Linde Y, mordenite and ZSM-5) on cordierite supports. Such preparative factors as crystallization time, crystallization temperature and basic strength were systematically investigated to discuss their effect on the growth of zeolites on cordierite supports. The as-prepared zeolite/cordierite samples were characterized by various techniques and a supposed in situ growth mechanism of zeolites on supports was given. The aluminium atoms on cordierite supports were activated by OH- and these activated atoms subsequently built a zeolite framework together with the silicon atoms and aluminium atoms of the synthesis gel. Based on this, the in situ deposition of zeolites can be easily extended to other aluminium-containing supports.With respect to pure zeolite powders, the in situ coated zeolites on supports exhibited much better stability and accessibility, which were thought essential for industrial applications. Copper ion-exchanged ZSM-5/cordierite was studied as catalyst for the direct decomposition of NO and selective catalytic reduction of NO by propane in excess oxygen. Cu-ZSM-5/cordierite was found to exhibit an obviously enhanced turnover frequency compared to Cu-ZSM-5 powders, which made it a potential deNOx catalyst for future applications.
Zeolite coatings, In situ synthesis, Cordierite, Stability, Accessibility, TOF
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【期刊论文】NO SCR with propane and propene on Co-based alumina catalysts prepared by co-precipitation
章福祥, Fuxiang Zhang, Shujuan Zhang, , Naijia Guan, Ellen Schreier, Manfred Richter, Reinhard Eckelt, Rolf Fricke
Applied Catalysis B: Environmental 73 (2007) 209–219,-0001,():
-1年11月30日
Homogeneous dispersions and small size of deposited high-content cobalt on alumina were achieved by the co-precipitation method and were well maintained on the cobalt-based binary alumina catalysts with Zn, Ag, Fe, Cu or Ni as modifiers. The component and concentration of deposited cobalt species were characterized by UV–vis, EDX and XPS spectra and found to be greatly related to the Co loading, calcination temperatures and the type of additive metals. The optimal Co loading of 8 wt% and calcination temperatures of 800℃ were demonstrated. With respect to the single cobalt-based alumina catalyst, the surface concentration of Co2+ on the binary catalysts with addition of Fe, Cu, Ag or Ni was all reduced and accompanying with part conversion of Co2+ to Co3O4 on the Fe and Ni-modified catalysts. A slight enhanced surface Co2+ concentration was only achieved on the Zn-promoted catalyst. It was also demonstrated that for the case of Cu and Fe the additive metals themselves participated in the activation of propene. The octahedral and tetrahedral Co2+ ions were suggested as the common active sites. A maximum deNOx activity of 96% was observed on the 8Co4ZnA800 catalyst at the reaction temperatures of 450℃, and the catalytic performance on the cobalt-based binary alumina catalysts can be described as fellows: CoZn > CoAg, CoNi > Co Cu > CoFe. Based on the in situ DRIFT spectra, different reaction intermediates R–ONO and –NCO besides –NO2 were formed on the 8Co4ZnA800 and 8Co4FeA800 samples, respectively, demonstrating their dissimilar reaction mechanisms.
Co-precipitation method, High cobalt content, Homogeneous dispersion, NO SCR
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章福祥, Xinxin Guan, Na Li, Guangjun Wu, Jixin Chen, Fuxiang Zhang, Naijia Guan
Journal of Molecular Catalysis A: Chemical 248 (2006) 220–225,-0001,():
-1年11月30日
The modification of HZSM-5 zeolite was carried out by nitridation of commercial HZSM-5 zeolites with flowing pure ammonia at high temperature. The modified HZSM-5 zeolites maintained high crystallinity and high specific surface areas of precursors testified by XRD, BET and SEM analysis. Compared with parent HZSM-5, the surface strong acid sites of modified HZSM-5 zeolites decreased severely as characterized by means of NH3-TPD analysis and pyridine-IR spectroscopy shows that nitridation mainly occurred in Br
Nitridation, HZSM-5 zeolite, Modification, Para-selectivity, Ethylation of ethylbenzene with ethanol
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【期刊论文】Synthesis of Anatase TiO2 Nanoparticles with β–Cyclodextrin as a Supramolecular Shell
章福祥, Landong Li, Xiaohong Sun, Yali Yang, Naijia Guan, and Fuxiang Zhang
Chem. Asian J. 2006, 1, 664 – 668,-0001,():
-1年11月30日
We report a novel, green hydrothermal- synthesis route to well-dispersed anatase TiO2 nanoparticles with particle sizes of 9–16 nm in the presence of β-CD (β-cyclodextrin). During the synthesis process, the CD-containing synthesis mixture assembled in both longitudinal and latitudinal directions. Driven by the interaction between molecules, the β-CDs assembled in the longitudinal direction to form long-chain compounds, whereas in the latitudinal direction, they tended to form regular aggregates through coordination with the Ti species from the hydrolysis of tetrabutyl titanate. In view of the effect of the coordination and the steric hindrance of β-CDs as a supramolecular shell, homogeneous nuclei and slow growth of TiO2 crystals during the synthesis process was observed, which was responsible for the formation of uniform TiO2 nanoparticles. The low β-CD dosage and the high product yield (>90%) demonstrated well the potential of this synthesis route in the large-scale industrial production of anatase nanoparticles.
anatase, cyclodextrins, self-assembly, supramolecular shells, titanium
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章福祥, Fuxiang Zhang, Yong Pi, Jie Cui, Yali Yang, Xiu Zhang, and Naijia Guan
J. Phys. Chem. C 2007, 111, 3756-3761,-0001,():
-1年11月30日
Photocatalytic reduction of nitrite ions on silver-doped titania catalysts prepared by photodeposition and chemical reduction methods was investigated. With respect to the Ag/TiO2 (C) catalyst prepared by the conventional chemical reduction method, the photoinduced synthesized Ag/TiO2 (P) samples showed a more homogeneous silver morphology and narrow size distribution. For the first time, selective conversion of nitrite ions to nitrogen instead of ammonia was achieved on the Ag/TiO2 (P) catalysts. A great influence of hole scavengers on the catalytic activity was observed and can be described as follows: H2C2O4 > HCOONa > C2H3OOH > C2H5OH > C2H3OONa > Na2C2O4. The optimal average activity of approximately 19 mmolN.gAg-1.min-1 was achieved on the 1 wt % Ag/TiO2 (P) sample under the modification of 0.04 mol/L oxalic acid, which was greatly higher than that on most of the previously supported noble metal catalysts (1-3 mmolN.gmetal -1.min-1) in terms of metal usage. It is interesting that slight influences of other anions such as SO42-, CO32-, or HCO3 - coexisting in drinking water were observed, which is different from previous works. Meanwhile, the effect of silver morphology as well as the photocatalytic mechanism of nitrite was discussed.
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【期刊论文】Facile Postsynthesis of Visible-Light-Sensitive Titanium Dioxide/Mesoporous SBA-15
章福祥, Zuyuan Wang, Fuxiang Zhang, Yali Yang, Bin Xue, Jie Cui, and Naijia Guan
Chem. Mater. 2007, 19, 3286-3293,-0001,():
-1年11月30日
Visible-light-sensitive titanium dioxide/mesoporous SBA-15 (TiO2/SBA-15) composites were synthesized through a postsynthetic approach with the assistance of ethylenediamine. The as-prepared nanocomposites were characterized by XRD, nitrogen adsorption, SEM, HRTEM/EDS, FT-IR, DR UVvis, and XPS. TiO2 nanoparticles are homogenously dispersed on the silica SBA-15. XPS analyses indicate that the oxygen atoms of TiO2 were partially substituted by nitrogen atoms, resulting in good response to the visible-light absorption. Ethylenediamine plays a double role: (1) etching the surface of silica SBA-15 and directing its regeneration and (2) introducing nitrogen atoms to the lattice of TiO2. The excellent photocatalytic activity of the composites is evaluated via the photodecomposition of phenol in the liquid phase under visible- and ultraviolet-light illumination. The conversion of phenol varies with the content of TiO2 in the composites, and the optimal value is up to 46.2% under illumination in the visible region.
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