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Theoretical Study of Dehydrogenation Reaction Mechanism on Cu10/TiO2,Au10/TiO2,Au8Cu2/TiO2,or Cu1/Au8Cu2/TiO2Surfaces 认领 引用
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作者 Hongwei Li Ruimin Wang +2 位作者 Caifang Han Bo Ren Hongjun Fan 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第2期225-232,I0069-I0071,I0170,共8页
Comprehensive analysis of the connection be-tween surface metal species and the mechanism of hydrogen(H2)generation on TiO2provides important new information for the develop-ment of more effective catalysts for ... Comprehensive analysis of the connection be-tween surface metal species and the mechanism of hydrogen(H2)generation on TiO2provides important new information for the develop-ment of more effective catalysts for H2 produc-tion.We have systematically investigated the mechanism of catalytic H2 generation on the Cu10/TiO2,Au10/TiO2,Au8Cu2/TiO2and Cu1/Au8Cu2/TiO2surfaces using density func-tional theory.Our results demonstrate an O-Hδ+···Hδ−-M type transition state for H2 production,and the Au8Cu2(0.54 eV)bimetal-lic cluster catalyst exhibits more activity in comparison to the Cu10(0.63 eV)and Au10(0.88 eV)cluster catalysts on the TiO2surface.On the Cu1/Au8Cu2/TiO2surface,we found that Au8Cu2clusters act as electron donors,while Cu single atom acts as an electron acceptor.Therefore,the Au8Cu2bimetallic catalyst has a low energy barrier(0.58 eV)in the reductive reaction of H2 production in water,but Cu single atom as the catalytic center has a higher en-ergy barrier(1.49 eV).This implies that bimetallic catalysts may be able to catalyze the wa-ter dehydrogenation reaction more successfully,which would be important knowledge for comprehending and refining the photocatalytic H2 generation process. 展开更多
关键词 TiO2surface Metal cluster Dehydrogenation Cu Au Bimetallic catalyst Den-sity functional theory
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Au负载量对TiO2/Au光阳极光吸收能力的影响研究 认领 引用
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作者 聂宗昊 闫伯涵 +1 位作者 祝孝栋 李秀玉 《应用物理》 2026年第5期456-464,共9页
为了研究Au负载量对TiO2/Au光阳极的光吸收能力的影响,本文采用水热法和柠檬酸钠还原法制备了TiO2/Au材料,通过刮涂法制备光阳极。利用紫外–可见吸收、X射线衍射(XRD)、透射电子显微镜(TEM)等手段对不同Au负载量的TiO2/Au材料和TiO2/A... 为了研究Au负载量对TiO2/Au光阳极的光吸收能力的影响,本文采用水热法和柠檬酸钠还原法制备了TiO2/Au材料,通过刮涂法制备光阳极。利用紫外–可见吸收、X射线衍射(XRD)、透射电子显微镜(TEM)等手段对不同Au负载量的TiO2/Au材料和TiO2/Au光阳极进行表征分析。结果表明,Au负载量在1.0 wt%时,TiO2/Au光阳极的光吸收能力最佳;低于1.0 wt%时,Au负载量提高,TiO2/Au光阳极的光吸收能力也随之提高;高于1.0 wt%时,Au负载量提高,TiO2/Au光阳极的光吸收能力随之降低。 展开更多
关键词 光阳极 TiO2 Au纳米颗粒 N719染料
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Novel promoting effects of cerium on the activities of NO_x reduction by NH_3 over TiO_2-SiO_2-WO_3 monolith catalysts 认领 引用 被引量：15
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作者 房志涛 林涛 +3 位作者 徐海迪 吴干学 孙萌萌 陈耀强 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第10期952-959,共8页
A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic re... A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic reduction（SCR） performance and SO2-resistant ability of TiO2-SiO2-WO3 were greatly enhanced by the introduction of cerium. The catalyst containing 10% CeO2 showed the highest NO conversion in a wide temperature range and good N2 selectivity with broad operation temperature window at the gas hourly space velocity（GHSV） of 30000 h–1, which was a very promising catalyst for NOx abatement from diesel engine exhaust. The catalysts were characterized by X-ray diffraction（XRD）, scanning electron microscopy with energy dispersive X-ray spectroscopy（SEM-EDS）, N2 adsorption-desorption（BET） and X-ray photoelectron spectroscopy（XPS）. The characterization results showed that the bigger pore radius, higher surface atomic concentration and dispersion of Ce and the abundant adsorbed oxygen on the surface of catalyst contributed to the best NH3-SCR performance of CeO2/TiO2-SiO2-WO3 catalyst containing 10% CeO2. 展开更多
关键词 NH3-SCR NO cerium CeO2/TiO2-SiO2-WO3 monolith catalyst rare earths
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Atmospheric-Pressure DBD Cold Plasma for Preparation of High Active Au/P25 Catalysts for Low-Temperature CO Oxidation 认领 引用 被引量：7
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作者 底兰波 詹志彬 +2 位作者 张秀玲 亓滨 徐伟杰 《Plasma Science and Technology》 SCIE EI CAS CSCD 2016年第5期544-548,共5页
Cold plasma generated by dielectric barrier discharge （DBD） at atmospheric pressure was adopted for preparation of commercial TiO2 Degussa P25 supported Au catalysts （Au/P25- P） with the assistance of the depositi... Cold plasma generated by dielectric barrier discharge （DBD） at atmospheric pressure was adopted for preparation of commercial TiO2 Degussa P25 supported Au catalysts （Au/P25- P） with the assistance of the deposition-precipitation procedure. The influences of the plasma reduction time and calcination on the performance of the Au/P25-P catalysts were investigated. CO oxidation was performed to investigate the catalytic activity of the Au/P25 catalysts. The results show that DBD cold plasma for the fabrication of Au/P25-P catalysts is a fast process, and Au/P25-P （4 min） exhibited the highest CO oxidation activity due to the complete reduction of Au compounds and less consumption of oxygen vacancies. In order to form more oxygen vacancies active species, Au/P25-P was calcined to obtain Au/P25-PC catalysts. Interestingly, Au/P25- PC exhibited the highest activity for CO oxidation among the Au/P25 samples. The results of transmission electron microscopy （TEM） indicated that the smaller size and high distribution of Au nanoparticles are the mean reasons for a high performance of Au/P25-PC. Atmospheric- pressure DBD cold plasma was proved to be of great efficiency in preparing high performance supported Au catalysts. 展开更多
关键词 atmospheric-pressure cold plasma dielectric barrier discharge （DBD） Au,TiO2 CO oxidation
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Effect of calcination temperature on structure and performance of Ni/TiO_2-SiO_2 catalyst for CO_2 reforming of methane 认领 引用 被引量：6
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作者 Sanbing Zhang Jiankang Wang Xiaolai Wang 《Journal of Natural Gas Chemistry》 2008年第2期179-183,共5页
The influence of calcination temperature on the structure and catalytic behavior of Ni/TiO2-SiO2 catalyst, for CO2 reforming of methane to synthesis gas under atmospheric pressure, was investigated. The results showed... The influence of calcination temperature on the structure and catalytic behavior of Ni/TiO2-SiO2 catalyst, for CO2 reforming of methane to synthesis gas under atmospheric pressure, was investigated. The results showed that the Ni/TiO2-SiO2 catalyst calcined at 700 ℃ had high and stable activity while the catalysts calcined at 550 and 850 ℃ had low and unstable activity. Depending on the calcination temperature, one, two, or three of the following Ni-containing species, NiO, Ni2.44Ti0.72Si0.07O4, and NiTiO3 were identified by combining the temperature programmed reduction （TPR） and X-ray diffraction （XRD） results. Their reducibility decreased in the sequence： NiO〉Ni2.44Ti0.72Si0.07O4〉NiTiO3. It suggests that high and stable activities observed over the Ni/TiO2-SiO2 catalyst calcined at 700 ~C were induced by the formation of Ni2.44Ti0.72Si0.07O4 and smaller NiO species crystallite size. 展开更多
关键词 Ni/TiO2-SiO2 catalyst sol-gel CO2 reforming methane
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Investigation of water adsorption and dissociation on Au_1/CeO_2 single-atom catalysts using density functional theory 认领 引用 被引量：3
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作者 Yan Tang Yang‐Gang Wang +1 位作者 Jin‐Xia Liang Jun Li 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第9期1558-1565,共8页
We examined the water adsorption and dissociation on ceria surfaces as well as ceria‐supported Au single‐atom catalysts using density functional theory calculations.Molecular and dissociative water were observed to ... We examined the water adsorption and dissociation on ceria surfaces as well as ceria‐supported Au single‐atom catalysts using density functional theory calculations.Molecular and dissociative water were observed to coexist on clean CeO2and reduced Au1/CeO2?x surfaces because of the small difference in adsorption energies,whereas the presence of dissociative water was highly favorable on reduced CeO2?x and clean Au1/CeO2surfaces.Positively charged Au single atoms on the ceria surface not only provided activation sites for water adsorption but also facilitated water dissociation by weakening the intramolecular O-H bonds.In contrast,negatively charged Au single atoms were not reactive for water adsorption because of the saturation of Au5d and6s electron shells.This work provides a fundamental understanding of the interaction between water and single‐atom Au catalysts. 展开更多
关键词 Single‐atom catalyst Au single atom Ceria H2O dissociation
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Synergistic catalytic removals of NO,CO and HC over CeO_2 modified Mn-Mo-W-O_x/TiO_2-SiO_2 catalyst 认领 引用 被引量：15
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作者 Qijie Jin Yuesong Shen +3 位作者 Guorong Sui Xingjun Tao Youchun Pan Shemin Zhu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2018年第2期148-155,共8页
A series of Mn-Mo-W-O_x/TiO_2-SiO_2 catalysts was modified with CeO_2 using an extrusion molding method. The catalytic activities of the obtained catalysts were tested for the synergistic catalytic removals of CO, NO ... A series of Mn-Mo-W-O_x/TiO_2-SiO_2 catalysts was modified with CeO_2 using an extrusion molding method. The catalytic activities of the obtained catalysts were tested for the synergistic catalytic removals of CO, NO and C_3H_8. The ratio of catalyst composition on catalytic activities for NH_3-SCR was optimized, which reveals that the molar ratio of Ti/Si was 9：1 and the catalyst containing 1.5 wt% CeO_2 and 12 wt% Mn-Mo-W-O_x exhibits the best catalytic performances. These samples were characterized by XRD, N_2-BET, Py-IR, NH_3-TPD, SEM/element mapping, H_2-TPR and XPS, respectively. Results show that the optimal catalyst exhibits more than 99% NO conversion, 86% CO conversion and 100% C_3H_8 conversion under GHSV of 5000 h^（-1）. In addition, the GHSV has little influence on removal of NO when it is less than 15,000 h^（-1）. Furthermore, the addition of CeO_2 will enhance the surface acidity, increase Mn^（4＋）concentration and inhibit the grain growth, which are favorable for the excellent catalytic performance.Anyway,the 1.5 wt% CeO_2-12 wt% Mn-Mo-W-O_x/TiO_2-SiO_2 possesses outstanding redox properties,abundant acid sites and high Mn^（4＋） concentration, which provide a guarantee for synergistic catalytic removal of CO, NO and HC. 展开更多
关键词 Mn-Mo-W-Ox/TiO2-SiO2 Cerium oxide additive Synergistic catalytic removal Nitrogen oxide Rare earths
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Catalytic decomposition of CH_4 over Ni-Al_2O_3-SiO_2 catalysts:Influence of pretreatment conditions for the production of H_2 认领 引用 被引量：2
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作者 Jangam Ashok Gangadhara Raju +2 位作者 Padigapati Shiva Reddy Machiraju Subrahmanyam Akula Venugopal 《Journal of Natural Gas Chemistry》 2008年第2期113-119,共7页
This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, a... This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, and effect of reductive pretreatment on the decomposition of methane activity is investigated. The physico-chemical characteristics of fresh and deactivated samples were characterized using BET-SA, XRD, TPR, SEM/TEM, CHNS analyses and correlated with the methane decomposition results obtained. The Ni-Al-Si （4 ： 0.5 ： 1.5） catalyst reduced with hydrazine hydrate produced better H2 yields of ca. 1815 mol H2/mol Ni than the catalyst reduced with 5% H2/N2. 展开更多
关键词 in situ reduction Ni-Al2O3-SiO2 catalyst methane decomposition hydrogen production carbon nanofibers
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Selective Hydrogenation of Butyne-1,4-diol to Butane-1,4-diol over Ni/Al_2O_3-SiO_2 Catalysts 认领 引用 被引量：2
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作者 Fang Jie Zhuang Changjian +2 位作者 Meng Jipeng Cheng Lang Lu Jiangyin 《China Petroleum Processing & Petrochemical Technology》 CAS 2018年第4期20-28,共9页
Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by... Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by a series of characterization techniques including BET, XRD, SEM, EDX-mapping, TEM, H_2-TPR, XPS, NH_3-TPD and Py-FTIR. Compared to Ni/Al_2O_3 catalyst, the SiO_2-doped samples exhibited better B_3D conversion. SiO_2 could help to form a strong interaction between NiO with the support, which inhibited Ni agglomeration at high temperature, improved the Ni dispersion, and enhanced the hydrogenation activity. B_1D selectivity was mainly influenced by the quantity of Lewis acid sites in addition to the Ni dispersion. The catalyst with a silica loading of 6.4% demonstrated an excellent selectivity of 75.18%(by 13% higher than the contrastive Ni/Al_2O_3 catalyst), which was attributed to the larger amount of Lewis acid sites and the moderate interaction between NiO with the support, which could facilitate the nickel dispersion on a preferable surface area of 176.3 m^2/g of support. 展开更多
关键词 Ni/Al2O3-SiO2 catalysts butyne-1,4-diol butane-1,4-diol hydrogenation
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Study on Au/Al_2O_3 catalysts for low-temperature CO oxidation in situ FT-IR 认领 引用
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作者 Xuhua Zou Shixue Qi +3 位作者 Jinguang Xu Zhanghuai Suo Lidun An Feng Li 《Journal of Natural Gas Chemistry》 2010年第3期307-312,共6页
Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were exa... Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were examined after separate treatment in CO＋O2 or CO2 ＋O2 .Furthermore,in situ FT-IR studies were performed to investigate the species on the surface when CO or CO＋O2 or CO2 ＋O2 was selected separately as adsorption gas.The results showed that Au/Al2O3 catalyst exhibited very high initial activity,but the catalytic activity was found to decrease gradually during CO oxidation with time on stream.And also,the activity of the catalyst declined after treatment in CO＋O2 or CO2 ＋O2 .The formation and accumulation of carbonate-like species during CO oxidation or treatment in CO＋O2 or CO2 ＋O2 might be mainly responsible for the activity decrease,which was reversible. 展开更多
关键词 supported gold catalyst Au/Al2O3 CO oxidation catalytic activity stability in situ FT-IR
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Comparative study of fluidized-bed and fixed-bed reactor for syngas methanation over Ni-W/TiO_2-SiO_2 catalyst 认领 引用 被引量：9
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作者 Bo Liu Shengfu Ji 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第5期740-746,共7页
In this work,syngas methanation over Ni-W/TiO2-SiO2catalyst was studied in a fluidized-bed reactor(FBR)and its performance was compared with a fixed-bed reactor(FIXBR).The effects of main operating variables including... In this work,syngas methanation over Ni-W/TiO2-SiO2catalyst was studied in a fluidized-bed reactor(FBR)and its performance was compared with a fixed-bed reactor(FIXBR).The effects of main operating variables including feedstock gases space velocity,coke content,bed temperature and sulfur-tolerant stability of 100 h life were investigated.The structure of the catalysts was characterized by XRD,N2adsorptiondesorption and TEM.It is found that under same space velocity from 5000 h 1to 25000 h 1FBR gave a higher CH4yield,lower coke content,and lower bed temperature than those obtained in FIXBR.Ni-W/TiO2-SiO2catalyst possessed excellent sulfur-tolerant stability on the feedstock gases less than 500 ppm H2S in FBR.The carbon deposits formed on the spent catalyst were in the form of carbon fibers in FBR,while in the form of dense accumulation distribution appearance in FIXBR. 展开更多
关键词 syngas methanation Ni-W/TiO2-SiO2catalyst fluidized bed fixed bed
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Au/FeO_x-TiO_2 as an efficient catalyst for the selective hydrogenation of phthalic anhydride to phthalide 认领 引用 被引量：2
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作者 Ying Xin Liu Tie Feng Xing +2 位作者 Yi Ming Luo Xiao Nian Li Wei Yan 《Chinese Chemical Letters》 SCIE CAS 2010年第11期1322-1325,共4页
Au/FeOx-TiO2,prepared by deposition-precipitation method,is an efficient and stable catalyst for the liquid phase selective hydrogenation of phthalic anhydride to phthalide under mild reaction conditions.
关键词 Au/FeOx-TiO2 catalyst Phthalic anhydride Liquid phase hydrogenation Phthalide
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N-羟基邻苯二甲酰亚胺和Au/TiO_2-SiO_2高效催化氧化环己烷研究 认领 引用
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作者 李杰 姚芳 +2 位作者 万超 崔平 许立信 《安徽工业大学学报（自然科学版）》 CAS 2016年第3期235-238,共4页
采用沉积沉淀法制备出Au/TiO_2-SiO_2催化剂,使用X射线衍射(XRD)和透射电子显微镜(TEM)对其进行表征,进一步考察N-羟基邻苯二甲酰亚胺(NHPI)和Au/TiO_2-SiO_2作为催化剂对环己烷氧化性能的影响。结果表明,NHPI与Au/TiO_2-SiO_2质量比为1... 采用沉积沉淀法制备出Au/TiO_2-SiO_2催化剂,使用X射线衍射(XRD)和透射电子显微镜(TEM)对其进行表征,进一步考察N-羟基邻苯二甲酰亚胺(NHPI)和Au/TiO_2-SiO_2作为催化剂对环己烷氧化性能的影响。结果表明,NHPI与Au/TiO_2-SiO_2质量比为1∶1,在150℃,氧气压力1.5 MPa下反应3 h,环己烷的转化率高到38.0%,酮醇选择性为79.4%。 展开更多
关键词 Au/TiO2-SiO2催化剂 N-羟基邻苯二甲酰亚胺(NHPI) 环己烷 催化氧化
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TiO_2纳米管负载Ag、Au、Pt纳米粒子的微波合成与表征 认领 引用 被引量：30
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作者 包华辉 徐铸德 +2 位作者 殷好勇 郑遗凡 陈卫祥 《无机化学学报》 SCIE CAS 北大核心 2005年第3期374-378,共5页
TiO2 nanotubes were prepared under normal pressure at a temperature of 120 ℃. Ag, Au, Pt nanoparticles supported on TiO2 nanotubes were prepared by m icrowave assisted heating polyol process. TEM images showed that m... TiO2 nanotubes were prepared under normal pressure at a temperature of 120 ℃. Ag, Au, Pt nanoparticles supported on TiO2 nanotubes were prepared by m icrowave assisted heating polyol process. TEM images showed that microwave prepa red Ag, Au, Pt nanoparticles supported on TiO2 nanotubes were small and well dis persed on the surface of the TiO2 nanotubes. UV-Vis absorption spectra showed th at the absorbance of Ag/TiO2 nanotubes and Au/TiO2 nanotubes in the visible ligh t range increased greatly compared to the single titania nanotubes. 展开更多
关键词 Au/TiO2 Ag/TiO2 表征 微波合成 TiO2纳米管 UV-Vis 纳米粒子 负载 TEM
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TiO_2-SiO_2双组分膜结构与光催化性能的研究 认领 引用 被引量：25
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作者 何静 江伟辉 +2 位作者 于云 宋力昕 胡行方 《无机材料学报》 SCIE EI CAS 北大核心 2005年第3期713-719,共7页
采用溶胶-凝胶法制备了不同Si/Ti比的TiO2-SiO2双组分膜.用紫外光照射亚甲基蓝的分解实验比较薄膜的光催化性能.通过XRD、FTIR、HRTEM、FE-SEM、AFM以及UV-VS-NIR分光光度计等分析手段对薄膜的结构和光学性能进行了表征.结果表明:适量S... 采用溶胶-凝胶法制备了不同Si/Ti比的TiO2-SiO2双组分膜.用紫外光照射亚甲基蓝的分解实验比较薄膜的光催化性能.通过XRD、FTIR、HRTEM、FE-SEM、AFM以及UV-VS-NIR分光光度计等分析手段对薄膜的结构和光学性能进行了表征.结果表明:适量SiO2的引入,显著提高了TiO2薄膜的光催化活性,Si/Ti比为0.2时薄膜的光催化活性为最佳. SiO2引入TiO2薄膜后,生成了Ti-O-Si玻璃相和无定形SiO2,这两种物相聚集在TiO2 晶界周围,有效地阻止了TiO2的晶粒长大,提高了锐钛矿相向金红石相的转变温度,使复合薄膜经过500℃热处理后,只有锐钛矿相存在,有利于薄膜的光催化活性的提高. 展开更多
关键词 TiO2-SiO2薄膜 双组分 溶胶-凝胶法 光催化性能
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TiO_2-SiO_2复合气凝胶:常压干燥制备及性能表征 认领 引用 被引量：13
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作者 冷小威 刘敬肖 +2 位作者 史非 殷澍 佐藤次雄 《无机化学学报》 SCIE CAS 北大核心 2009年第10期1791-1796,共6页
以廉价的四氯化钛和工业水玻璃为原料,通过溶胶-凝胶法制得TiO2-SiO2复合湿凝胶,用三甲基氯硅烷(TMCS)/乙醇(EtOH)/正己烷(Hexane)混合溶液对湿凝胶进行改性,常压干燥制备了TiO2-SiO2复合气凝胶。利用扫描电子显微镜(SEM)、透射电子显微... 以廉价的四氯化钛和工业水玻璃为原料,通过溶胶-凝胶法制得TiO2-SiO2复合湿凝胶,用三甲基氯硅烷(TMCS)/乙醇(EtOH)/正己烷(Hexane)混合溶液对湿凝胶进行改性,常压干燥制备了TiO2-SiO2复合气凝胶。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、红外光谱(FTIR)、X射线衍射(XRD)及N2吸附/脱附法对复合气凝胶的形貌和性质进行了分析。结果表明,TiO2-SiO2复合气凝胶具有连续多孔结构,150℃干燥后复合气凝胶的比表面积为1 076 m2.g-1,孔体积为4.96 cm3.g-1;经550℃热处理后,复合气凝胶仍然具有高的孔隙率,比表面积为856 m2.g-1,孔体积为3.46 cm3.g-1。吸附和光催化降解罗丹明B的结果表明,复合气凝胶同时具有较好的吸附和光催化性能,其吸附/光催化协同作用活性优于纯SiO2气凝胶和锐钛矿TiO2粉末;且重复利用四次降解率仍然可达到89%。 展开更多
关键词 TiO2-SiO2 气凝胶 常压干燥 吸附 光催化
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Effects of Atmospheres and Precursors on MnO_x/TiO_2 Catalysts for NH_3-SCR at Low Temperature 认领 引用 被引量：17
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作者 方德 HE Feng +2 位作者 谢峻林 FU Zhengbing CHEN Junfu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第5期888-892,共5页
The effects of atmospheres and precursors on MnOx/TiO2 catalysts were studied, which were prepared by the impregnation method and tested for their NOx conversion activity in ammonia selective catalytic reduction （NH3... The effects of atmospheres and precursors on MnOx/TiO2 catalysts were studied, which were prepared by the impregnation method and tested for their NOx conversion activity in ammonia selective catalytic reduction （NH3-SCR） reactions. Results showed that the manganese carbonate （MC） precursor caused mainly Mn2O3, while the manganese nitrate （MN） precursor resulted primarily in MnO2 and the manganese sulfate （MS） precursor was unchanged. The manganese acetate （MA） precursor leaded obtaining a mixture of Mn2O3 and Mn304. NOn conversion decreased in the following order： MA/TiO2 〉 MC/TiO2 〉 MN/TiO2 〉 MS/TiO2 〉 P25, with a calcination temperature of 773 K in air. Catalysts that were prepared by MA and calcined in oxygen performed strong interaction between Ti and Mn, while MnTiO3 was observed. Compared to the catalysts calcined in nitrogen, those calcined in oxygen had larger diameter and smaller surface area and pore. Catalysts that were prepared by MA and calcined in nitrogen tended to gain higher denitration rates than those in air, since they could be prepared with significant specific surface areas. NO., conversion decreased with calcination atmospheres： Nitrogen〉 Air〉 Oxygen. Meanwhile, amorphous Mn2O3 turned into crystalline Mn2O3, when the temperatures increased from 673 to 873 K. 展开更多
关键词 MnOx/TiO2 catalyst precursor atmosphere NH3-SCR
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Improving the denitration performance and K-poisoning resistance of the V_2O_5-WO_3/TiO_2 catalyst by Ce4+ and Zr4+ co-doping 认领 引用 被引量：21
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作者 Jun Cao Xiaojiang Yao +4 位作者 Fumo Yang Li Chen Min Fu Changjin Tang Lin Dong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第1期95-104,共10页
A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐W... A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐WO3/TiO2 catalyst.The physicochemical properties were investigated by using XRD,BET,NH3‐TPD,H2‐TPR,and XPS,and the catalytic performance and K‐poisoning resistance were evaluated via a NH3‐SCR model reaction.Ce^4+and Zr^4+co‐doping were found to enhance the conversion of NOx,and exhibit the best K‐poisoning resistance owing to the largest BET‐specific surface area,pore volume,and total acid site concentration,as well as the minimal effects on the surface acidity and redox ability from K poisoning.The V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst also presents outstanding H2O+SO2 tolerance.Finally,the in situ DRIFTS reveals that the NH3‐SCR reaction over the V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst follows an L‐H mechanism,and that K poisoning does not change the reaction mechanism. 展开更多
关键词 V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst Co‐doping K‐poisoning NH3‐SCR Reaction mechanism
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SO_42-/TiO_2-SiO_2的制备及对甲基橙的光催化降解 认领 引用 被引量：16
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作者 颜秀茹 白天 +2 位作者 韩芳 郭秀盈 王建萍 《无机化学学报》 SCIE CAS 北大核心 2003年第10期1125-1128,共4页
0引言水中难降解有机物的治理已成为当今重要的环境问题,对新型高效水处理剂的需求也愈加迫切.
关键词 SO4^2- TiO2-SiO2 制备 甲基橙 光催化降解 污水处理 催化剂 二氧化钛 二氧化硫
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La/TiO_2-SiO_2薄膜的光催化性能研究 认领 引用 被引量：13
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作者 何静 江伟辉 +2 位作者 于云 宋力昕 胡行方 《无机材料学报》 SCIE EI CAS 北大核心 2006年第1期230-234,共5页
采用溶胶-凝胶法制备了不同掺杂量的La／TiO2-SiO2复合薄膜．通过XRD、 FE-SEM和AFM研究了复合薄膜的微观结构,采用紫外光照射下亚甲基蓝的分解实验比较薄膜的光催化性能．结果表明:La掺杂可显著提高TiO2-SiO2复合薄膜的光催化活性,以5... 采用溶胶-凝胶法制备了不同掺杂量的La／TiO2-SiO2复合薄膜．通过XRD、 FE-SEM和AFM研究了复合薄膜的微观结构,采用紫外光照射下亚甲基蓝的分解实验比较薄膜的光催化性能．结果表明:La掺杂可显著提高TiO2-SiO2复合薄膜的光催化活性,以5％掺杂量为最佳,其光降解率比掺杂前提高了约23％．薄膜活性提高的主要原因是La掺杂后细化了TiO2的晶粒,提高了薄膜的比表面积,使其具有更高的氧化还原电势,La2+取代Ti4+ 进入到TiO2晶格,引起晶格膨胀,这种不同价离子的取代导致TiO2粒子表面电荷分布不平衡,从而提高了光生电子-空穴的分离效率． 展开更多
关键词 TiO2-SiO2薄膜 La掺杂 溶胶-凝胶法 光催化性能
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