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Ultrafine Pt nanoparticles supported on double-shelled C/TiO2 hollow spheres material as highly efficient methanol oxidation catalysts 被引量:5
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作者 Xiaoyu Yue Yuguang Pu +2 位作者 Wen Zhang Ting Zhang Wei Gao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第10期275-282,共8页
Catalyst support is extremely important for future fuel cell devices.In this work,we developed doubleshelled C/TiO2(DSCT)hollow spheres as an excellent catalyst support via a template-directed method.The combination o... Catalyst support is extremely important for future fuel cell devices.In this work,we developed doubleshelled C/TiO2(DSCT)hollow spheres as an excellent catalyst support via a template-directed method.The combination of hollow structure,TiO2 shell and carbon layer results in excellent electron conductivity,electrocatalytic activity,and chemical stability.These uniformed DSCT hollow spheres are used as catalyst support to synthesize Pt/DSCT hollow spheres electrocatalyst.The resulting Pt/DSCT hollow spheres exhibited high catalytic performance with a current density of 462 mA mg^-1 for methanol oxidation reaction,which is 2.52 times higher than that of the commercial Pt/C.Furthermore,the increased tolerance to carbonaceous poisoning with a higher If/Ibratio and a better long-term stability in acid media suggests that the DSCT hollow sphere is a promising C/TiO2-based catalyst support for direct methanol fuel cells applications. 展开更多
关键词 Catalyst support C/tio2 hollow sphere Metal-support interactions Methanol oxidation reaction
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Photocatalytic degradation of L- acid by TiO_2 supported on the activated carbon 被引量:2
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作者 WANG Yu-ping WANG Lian-jun PENG Pan-ying 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第3期562-566,共5页
TiO2 sol was prepared by sol-gel technique with tetrabutyl titanate as precursor. Supported TiO2 catalysts on activated carbon were prepared by soak and sintering method. The aggregation of nano-TiO2 particles can be ... TiO2 sol was prepared by sol-gel technique with tetrabutyl titanate as precursor. Supported TiO2 catalysts on activated carbon were prepared by soak and sintering method. The aggregation of nano-TiO2 particles can be effectively suppressed by added polyethylene glycol (PEG) as a surface modifier. The average particle diameter of TiO2, specific surface area and absorbability of catalyst can be modified. Based on characteristics of the TiO2 photocatalyst with XRD, specific surface area, adsorption valves of methylene blue and the amount of TiO2 supported on the activated carbon, the photocatalytic degradation of L-acid was studied. The effect of the factors, such as pH of the solution, the initial concentration of L-acid on the photocatalytic degradation of L-acid, were studied also. It was found that when the pH of the solution is 1.95, the amount of photocatalyst is 0.5 g, the concentration of the L-acid solution is 1.34×10^3 mol/L and the illumination time is 7 h, the photocatalytic degradation efficiency of L-acid can reach 89,88%, The catalyst was reused 6 times and its degradation efficiency hardly changed. 展开更多
关键词 L-acid activated carbon supported tio2 PHOTODEGRADAtioN
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CO_2 methanation over TiO_2–Al_2O_3 binary oxides supported Ru catalysts 被引量:5
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作者 Jinghua Xu Qingquan Lin +3 位作者 Xiong Su Hongmin Duan Haoran Geng Yanqiang Huang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第1期140-145,共6页
TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO_2–Al_2O_3catalyst in CO_2 methanation reaction was inv... TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO_2–Al_2O_3catalyst in CO_2 methanation reaction was investigated. Compared with Ru/Al_2O_3 catalyst, the Ru/TiO_2–Al_2O_3catalytic system exhibited a much higher activity in CO_2 methanation reaction. The reaction rate over Ru/TiO_2–Al_2O_3 was 0.59 mol CO_2·(g Ru)1·h-1, 3.1 times higher than that on Ru/Al_2O_3[0.19 mol CO_2·(gRu)-1·h-1]. The effect of TiO_2 content and TiO_2–Al_2O_3calcination temperature on catalytic performance was addressed. The corresponding structures of each catalyst were characterized by means of H_2-TPR, XRD, and TEM. Results indicated that the averaged particle size of the Ru on TiO_2–Al_2O_3support is 2.8 nm, smaller than that on Al_2O_3 support of 4.3 nm. Therefore, we conclude that the improved activity over Ru/TiO_2–Al_2O_3catalyst is originated from the smaller particle size of ruthenium resulting from a strong interaction between Ru and the rutile-TiO_2 support, which hindered the aggregation of Ru nanoparticles. 展开更多
关键词 CO2 methanation supported Ru catalyst tio2–Al2O3 binary oxide
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Kinetic Modeling of the Photocatalytic Degradation of Methyl Orange by Supported TiO2 被引量:2
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作者 N. Barka S. Qourzal A. Assabbane Y. Ait-Ichou 《Journal of Environmental Science and Engineering》 2010年第5期1-5,共5页
The photocatalytic degradation of methyl orange (MO) in UV/Supported-TiO2 system was investigated and a kinetic model was presented. The experimental results show that the photocatalytic degradation rate is favored ... The photocatalytic degradation of methyl orange (MO) in UV/Supported-TiO2 system was investigated and a kinetic model was presented. The experimental results show that the photocatalytic degradation rate is favored by high concentration of dye in solution and is enhanced by the solution temperature. A simple kinetic model has been proposed which can describe the discoloration process in an adequate way. The calculated results obtained were in good agreement with experimental data. The model predicts the concentration of MO during the photocatalytic degradation process. 展开更多
关键词 Kinetics modeling PHOTOCATALYSIS methyl orange supported tio2.
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Preparation and Application of Supported Amorphous Alloy Catalyst CoP/TiO_2 被引量:1
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作者 韩长秀 任吉丽 张宝贵 《Transactions of Tianjin University》 EI CAS 2008年第1期73-77,共5页
A new supported amorphous catalyst CoP/TiO2 was prepared by chemical reduction and characterized by ICP, XRD, TEM, BET and DSC. Its application in decomposing PH3 to high purity phosphor and its catalytic activity wer... A new supported amorphous catalyst CoP/TiO2 was prepared by chemical reduction and characterized by ICP, XRD, TEM, BET and DSC. Its application in decomposing PH3 to high purity phosphor and its catalytic activity were studied. The decomposition rate is over 95% at 450 ℃. For comparison, unsupported CoP amorphous catalyst was prepared by the same method. The result suggests that CoP/TiO2 exhibits higher thermal stability and catalytic activity than CoP, which is attributed to the high dispersion of CoP alloy particles on the support-TiO2. 展开更多
关键词 CoP amorphous catalyst CoP/tio2 supported catalyst PHOSPHINE
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Corrigendum to “TiO2 supported cobalt-manganese nano catalysts for light olefins production from syngas” [Journal of Energy Chemistry22(4)(2013) 645–652] 被引量:1
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作者 Mostafa Feyzi Asadollah Hassankhani 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第12期275-275,共1页
关键词 tio2 supported cobalt-manganese nano catalysts for light olefins production from syngas Corrigendum to Journal of Energy Chemistry22
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Support Effects on Thiophene Hydrodesulfurization over Co-Mo-Ni/Al_2O_3 and Co-Mo-Ni/TiO_2-Al_2O_3 Catalysts 被引量:7
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作者 刘超 周志明 +2 位作者 黄永利 程振民 袁渭康 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第4期383-391,共9页
A carbon-based sulfonated catalyst was prepared by direct sulfonation and carbonization (in moderate conditions:200 &#176;C, 12 h) of red liquor solids, a by-product of paper-making process. The prepared sulfonate... A carbon-based sulfonated catalyst was prepared by direct sulfonation and carbonization (in moderate conditions:200 &#176;C, 12 h) of red liquor solids, a by-product of paper-making process. The prepared sulfonated cata-lyst (SC) had aromatic structure, composed of carbon enriched inner core, and oxygen-containing (SO3H, COOH, OH) groups enriched surface. The SO3H, COOH, OH groups amounted to 0.74 mmol·g^-1, 0.78 mmol·g^-1, 2.18 mmol·g^-1, respectively. The fresh SC showed much higher catalytic activity than that of the traditional solid acid catalysts (strong-acid 732 cation exchange resin, hydrogen type zeolite socony mobile-five (HZSM-5), sulfated zir-conia) in esterification of oleic acid. SC was deactivated during the reactions, through the mechanisms of leaching of sulfonated species and formation of sulfonate esters. Two regeneration methods were developed, and the catalytic activity can be mostly regenerated by regeneration Method 1 and be fully regenerated by regeneration Method 2, respectively. 展开更多
关键词 HYDRODESULFURIZAtioN support hierarchically macro-/mesoporous structure AL2O3 tio2-Al2O3
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TiO_2负载非晶态合金NiB催化剂的制备、表征及HDS动力学研究 被引量:18
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作者 程庆彦 李伟 +2 位作者 吴隽 关乃佳 陶克毅 《燃料化学学报》 EI CAS CSCD 北大核心 2000年第3期249-252,共4页
用等体积浸渍 -还原法制备了负载型的NiB/TiO2 (B/Ni=5∶1摩尔比 )非晶态合金 ,并在相同条件下制备了NiB/Al2 O3 (B/Ni=5∶1摩尔比 )与之对照。用XRD、SEM和TEM等表征方法比较了样品的非晶性质。在脉冲微反 -色谱装置上以噻吩的HDS反应... 用等体积浸渍 -还原法制备了负载型的NiB/TiO2 (B/Ni=5∶1摩尔比 )非晶态合金 ,并在相同条件下制备了NiB/Al2 O3 (B/Ni=5∶1摩尔比 )与之对照。用XRD、SEM和TEM等表征方法比较了样品的非晶性质。在脉冲微反 -色谱装置上以噻吩的HDS反应为探针测定了NiB/TiO2 、NiB/Al2 O3 的反应活性 ,进行了动力学研究。结果证明 ,NiB/TiO2 的低温活性远高于NiB/Al2 O3 ,其原因是它的活化能远远小于后者。 展开更多
关键词 负载型 HDS 非晶态合金 二氧化钛 催化剂 硼化镍
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负载型TiO_2固定相光催化氧化法降解水中呋码唑酮 被引量:25
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作者 包南 王吉顺 +1 位作者 邓丛蕊 陈艳晶 《中国环境科学》 EI CAS CSSCI CSCD 北大核心 1998年第5期458-462,共5页
以高压汞灯为光源、负载在海砂上的TiO2为催化剂,采用敞口固定床型光催化反应器对水中难降解的呋码唑酮(FTD)进行了固定相光催化氧化实验。结果表明,反应速率可用LangmuirHinshelwood方程描述,与光分... 以高压汞灯为光源、负载在海砂上的TiO2为催化剂,采用敞口固定床型光催化反应器对水中难降解的呋码唑酮(FTD)进行了固定相光催化氧化实验。结果表明,反应速率可用LangmuirHinshelwood方程描述,与光分解相比,光催化氧化的突出优点是矿化程度高,相同光辐射条件下反应100min,0.10mmol/L的FTD水溶液经光催化氧化后TOC的去除率为89.1%,而经光分解后TOC的去除率仅为28.8%;在反应体系中投加少量臭氧或过氧化氢可以显著提高FTD的氧化效率,说明光催化氧化可以兼容O3/UV、H2O2/UV等光激发氧化工艺。制得的负载型TiO2具有较高的机械强度和化学稳定性,可重复利用。探讨了充氧、FTD浓度及pH值等对光催化氧化过程的影响。 展开更多
关键词 光催化 氧化 呋码唑酮 降解 制药 废水处理 催化
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负载型TiO_2-聚丙烯疏水复合膜的制备与表征 被引量:4
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作者 钟顺和 李传峰 +1 位作者 孙宏伟 肖秀芬 《膜科学与技术》 CAS CSCD 北大核心 2002年第4期21-25,共5页
采用热致相分离 (TIPS)技术制备浸涂型和反应型硅藻土 -聚丙烯疏水复合膜 ,用SEM、氮吸附、红外光谱和气体渗透性能测试装置等方法表征不同的制膜方法、浸膜液浓度及冷却方式等因素对膜形态、结构和气体渗透性能的影响 .结果表明 :浸涂... 采用热致相分离 (TIPS)技术制备浸涂型和反应型硅藻土 -聚丙烯疏水复合膜 ,用SEM、氮吸附、红外光谱和气体渗透性能测试装置等方法表征不同的制膜方法、浸膜液浓度及冷却方式等因素对膜形态、结构和气体渗透性能的影响 .结果表明 :浸涂型聚丙烯膜球形颗粒和孔径尺寸均小于反应型聚丙烯膜 ;TiO2 -聚丙烯膜与硅藻土陶瓷支承体是通过Si—O—Ti—O—C键的价联方式形成键联型复合膜层 ;在膜内 ,气体渗透由Knudsen扩散控制 ,H2 O与N2 的分离因子分别为 2 .4 6和 2 .2 2 . 展开更多
关键词 负载型 热致相分离 tio2-聚丙烯膜 负载型疏水复合膜 制备 表征
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负载TiO_2催化降解乙萘酚 被引量:1
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作者 丁海燕 王玉萍 +1 位作者 谢云 彭盘英 《南京师范大学学报(工程技术版)》 CAS 2003年第2期5-7,45,共4页
采用负载于活性炭载体上的TiO2 为催化剂 ,研究了在 2 5 0W高压汞灯照射下溶液中乙萘酚的光催化降解方法 ,探讨了不同负载次数、不同初始浓度、不同pH和光照时间对乙萘酚光催化降解效果的影响 .
关键词 负载tio2催化剂 光催化氧化 活性炭 乙萘酚
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溶胶-凝胶法制备负载型TiO_2膜的研究 被引量:3
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作者 郭清萍 钟顺和 《化学研究与应用》 CAS CSCD 1997年第3期235-239,共5页
本研究采用溶胶-凝胶(Sol-Gel)法制备了负载型TiO2膜,并采用SEM、压汞等实验手段对Ti(OH)4溶胶和TiO2膜进行了表征。实验表明:Ti(OH)4溶胶制备过程中H2O/Ti4+、C2H5OH/Ti4+的... 本研究采用溶胶-凝胶(Sol-Gel)法制备了负载型TiO2膜,并采用SEM、压汞等实验手段对Ti(OH)4溶胶和TiO2膜进行了表征。实验表明:Ti(OH)4溶胶制备过程中H2O/Ti4+、C2H5OH/Ti4+的比值,溶胶在支承管上浸涂的时间、次数以及凝胶煅烧升温速度和煅烧温度均是制备负载型TiO2膜的重要因素。最终制得一种无裂纹、20μm厚、孔径分布在50~300nm之间的负载型TiO2膜。 展开更多
关键词 负载型 二氧化钛膜 膜催化剂 溶胶-凝胶法
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玻璃纤维支撑TiO_2对有机污染物的光催化降解 被引量:2
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作者 胡安正 唐超群 《材料开发与应用》 CAS 2003年第4期36-37,41,共3页
介绍了纳米TiO2 粉体的制备方法 ,通过对不同浓度、不同光照条件下的悬浮状和支撑状TiO2 光催化降解有机污染物 (以苯甲酰胺为例 )的试验结果分析 ,发现包覆在玻璃纤维上的TiO2
关键词 悬浮状tio2 支撑状tio2 光催化降解 有机污染物
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TiO_2光催化剂固定化技术 被引量:13
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作者 黄艳娥 《河北理工学院学报》 CAS 2001年第2期74-77,共4页
介绍了 Ti O2 光催化剂固定化技术中 ,载体的种类、性能及固载方法 ,分析了固载过程中各种因素对 Ti O2 光催化活性的影响 。
关键词 纳米级 二氧化钛 固定化 载体 光催化反应器 光催化剂
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负载型 TiO_2-聚丙烯微孔复合膜的制备及性能 被引量:2
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作者 郭清萍 钟顺和 《太原工业大学学报》 1997年第3期83-86,共4页
用熔融浸涂法制备了负载型TiO2-聚丙烯复合膜,采用SEM、压汞、透气性实验手段对其孔径分布、形貌、扩散性能进行了表征。实验结果表明,复合膜表层聚丙烯膜厚为30μm、孔径分布在4~150nm之间时,对CO,H2,N2... 用熔融浸涂法制备了负载型TiO2-聚丙烯复合膜,采用SEM、压汞、透气性实验手段对其孔径分布、形貌、扩散性能进行了表征。实验结果表明,复合膜表层聚丙烯膜厚为30μm、孔径分布在4~150nm之间时,对CO,H2,N2有较好的渗透性能。 展开更多
关键词 熔融浸涂法 负载型 聚丙烯膜 二氧化钛
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Methanol Adsorption on TiO2 Film Studied by Sum Frequency Generation Vibrational Spectroscopy
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作者 冯冉冉 刘安安 +3 位作者 刘烁 施骄健 刘怡 任泽峰 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2015年第1期11-16,I0001,共7页
A broadband infrared surface sum frequency generation vibrational spectroscopy (SFG-VS) and an in situ UV excitation setup devoted to studying surface photocatalysis have been constructed. With a home-made compact h... A broadband infrared surface sum frequency generation vibrational spectroscopy (SFG-VS) and an in situ UV excitation setup devoted to studying surface photocatalysis have been constructed. With a home-made compact high vacuum cell, organic contaminants on TiO2 thin film surface prepared by RF magnetron sputtering were in situ removed under 266 nm irradiation in 10 kPa 02 atmosphere. We obtained the methanol spectrum in the CH3 stretching vibration region on TiO2 surface with changing the methanol pressure at room temperature. Features of both molecular and dissociative methanol, methoxy, adsorbed on this surface were resolved. The CH3 symmetric stretching vibration frequency and Fermi resonance of molecular methanol is red-shifted by about 6-8 cm-1 from low to high coverage. Moreover, the recombination of dissociative methanol and H on Surfaces in vacuum was also observed. Our results suggest two equilibria exist: between molecular methanol in the gas phase and that on surfaces, and between molecular methanol and dissociative methanol on surfaces. 展开更多
关键词 Surface sum frequency generation vibrational spectroscopy Surface photo-catalysis tio2
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Cd S/TiO2/ACFs光催化处理染料废水的试验研究 被引量:3
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作者 王斯琪 赵小菲 《供水技术》 2019年第1期14-16,共3页
采用负载型CdS/TiO2/ACFs复合半导体材料对孔雀石绿染料废水进行光催化处理,分别考察了pH、反应时间、催化剂投加量等因素对处理效果的影响。结果表明:负载型CdS/TiO2/ACFs复合半导体对色度为250倍、COD为444mg/L的孔雀石绿染料废水,色... 采用负载型CdS/TiO2/ACFs复合半导体材料对孔雀石绿染料废水进行光催化处理,分别考察了pH、反应时间、催化剂投加量等因素对处理效果的影响。结果表明:负载型CdS/TiO2/ACFs复合半导体对色度为250倍、COD为444mg/L的孔雀石绿染料废水,色度、COD去除率分别为97%和88%。 展开更多
关键词 负载型CdS/tio2/ACFs 复合半导体材料 光催化 孔雀石绿 染料废水
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双金属氧化物TiO_2基催化剂的氧化还原性能
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作者 张英华 刘振民 +2 位作者 卢海强 刘建红 王远洋 《工业催化》 CAS 2018年第2期39-47,共9页
以金属硝酸盐为前驱物,乙二胺四乙酸为助剂,采用正交实验设计和浸渍法制备Cu-Ni、Cu-Fe和Ni-Fe系列TiO_2基双金属氧化物催化剂,通过XRD和H_2-TPR进行表征,评价其氧化还原性能。结果表明,活性组分为Cu和Fe、物质的量比为0.2∶0.2、pH为8.... 以金属硝酸盐为前驱物,乙二胺四乙酸为助剂,采用正交实验设计和浸渍法制备Cu-Ni、Cu-Fe和Ni-Fe系列TiO_2基双金属氧化物催化剂,通过XRD和H_2-TPR进行表征,评价其氧化还原性能。结果表明,活性组分为Cu和Fe、物质的量比为0.2∶0.2、pH为8.0和400℃焙烧的5#催化剂具有优良的氧化还原性能,起始还原温度148℃条件下,耗氢量达80.72 mmol·g-1。活性组分、物质的量比、pH值和焙烧温度等催化剂制备参数影响氧化还原反应的难易(起始还原温度)和强弱(耗氢量),Cu和Fe物质的量比为0.2∶0.2的催化剂由于协同效应具有最低的起始还原温度和很高的耗氢量。较低物质的量比含Ni活性组分的催化剂由于形成复合金属氧化物固溶体而难以在较低温度被还原,中性或碱性条件下通过氢氧化物脱水生成金属氧化物有助于提高催化剂的耗氢量,400℃足以形成适宜的晶型以提高催化剂氧化还原性能。 展开更多
关键词 催化剂工程 正交实验设计 浸渍法 双金属氧化物tio2基催化剂 氧化还原
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纳米TiO_2在水处理中的问题及解决方法 被引量:10
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作者 黄艳娥 《河北理工学院学报》 2000年第4期107-115,共9页
介绍了纳米 Ti O2 光催化剂在水处理中催化作用的原理 ,指出了该催化剂在水处理中面临的问题 。
关键词 光催化剂 纳米级 二氧化钛 水处理 电子/空穴对 支载固定 废水处理
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Degradation of Antibiotics in Aqueous Solution by Photocatalytic Process: Comparing the Efficiency in the Use of ZnO or TiO2
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作者 Barbara Ambrosetti Luigi Campanella Raffaella Palmisano 《Journal of Environmental Science and Engineering(A)》 2015年第6期273-281,共9页
The study examined the photodegradative efficiency of ZnO and TiO2 in degradation of antibiotics in aqueous matrices. Among several types of antibiotics, four antibiotics were chosen to feature the major classes of th... The study examined the photodegradative efficiency of ZnO and TiO2 in degradation of antibiotics in aqueous matrices. Among several types of antibiotics, four antibiotics were chosen to feature the major classes of these compounds: amoxicillin, erythromycin, streptomycin and ciprofloxacin. Degradation of antibiotic solutions was carried out mainly under UV-light irradiation in a set time with the presence of small quantity of zinc oxide or titanium dioxide. Solutions were analyzed with HPLC chromatography and degradation percentages were calculated from ratio between pick area associated to no degraded drug solution and degraded drug solution's pick area. Meanwhile, toxicity of antibiotics and degrading compounds were investigated using a biosensor system, consisting of Clark's electrode associated with a portion of agar medium culture containing Saccharomyces Cerevisiae yeast cells. This way, it was possible to define the oxygen that was consumed by yeast cells. Toxicity associated to antibiotics and degrading products are related to decrease of oxygen concentration in solution. It is clear that zinc oxide is slower than titanium dioxide to degrade antibiotics, but zinc oxide shows better photodegradation efficiency than titanium dioxide in spite of its small specific superficial area. 展开更多
关键词 ANTIBIOTICS DEGRADAtioN photo-catalysis ZNO tio2 toxicity.
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