Physicochemical properties of TiO2SiO2 unmodified and modified with H2SO4 and activity for acid catalysis

Q4 Chemical Engineering

分子催化 Pub Date : 1994-10-13 DOI:10.1016/0304-5102(94)00117-0

Jong Rack Sohn , Hyang Ja Jang , Man Young Park , Eun Hee Park , Sang Eun Park

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引用次数: 25

Abstract

A series of TiO₂SiO₂ catalysts were prepared by coprecipitation from the mixed solution of titanium tetrachloride and sodium silicate. Some of the sample were modified with 0.5 M H₂SO₄ and used as modified catalysts. The addition of TiO₂ to SiO₂ caused the increase of acidity and acid strength, and the shifts of OH and SiO stretching bands of silanol group to lower frequencies in proportion to the TiO₂ content. Catalytic activities for 2-propanol dehydration and cumene dealkylation increased in relation to the increase of acidity and the band shifts to lower frequencies. The catalytic activities of modified catalysts were higher than those of unmodified catalysts, and the effect of modification on catalytic activity was higher for 2-propanol dehydration than for cumene dealkylation. The effect of modification on catalytic activity increased with increasing TiO₂ content of the catalysts. Actually, 92-TiO₂SiO₂/SO²⁻₄ had the highest increment in catalytic activity and 10-TiO₂SiO₂/SO²⁻₄ had the lowest increment for the 2-propanol dehydration.

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TiO2SiO2未经H2SO4修饰和经H2SO4修饰后的理化性质及酸催化活性

以四氯化钛与水玻璃的混合溶液为原料，采用共沉淀法制备了一系列TiO2SiO2催化剂。用0.5 M H2SO4对部分样品进行改性，作为改性催化剂。SiO2中加入TiO2后，其酸性和酸强度增加，硅醇基OH和SiO拉伸带随TiO2含量的增加而向较低频率偏移。2-丙醇脱水和异丙烯脱烷基的催化活性随酸度的增加而增加，且能带向低频移动。改性催化剂的催化活性高于未改性催化剂，改性对2-丙醇脱水催化活性的影响大于对异丙烯脱烷基催化活性的影响。改性对催化剂活性的影响随着TiO2含量的增加而增强。实际上，92-TiO2SiO2/SO2−4对2-丙醇脱水的催化活性增量最大，10-TiO2SiO2/SO2−4的催化活性增量最小。

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来源期刊

分子催化 Chemical Engineering-Catalysis

CiteScore

1.50

自引率

0.00%

发文量

2959

期刊介绍： Journal of Molecular Catalysis (China) is a bimonthly journal, founded in 1987. It is a bimonthly journal, founded in 1987, sponsored by Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, under the supervision of Chinese Academy of Sciences, and published by Science Publishing House, which is a scholarly journal openly circulated both at home and abroad. The journal mainly reports the latest progress and research results on molecular catalysis. It contains academic papers, research briefs, research reports and progress reviews. The content focuses on coordination catalysis, enzyme catalysis, light-ribbed catalysis, stereochemistry in catalysis, catalytic reaction mechanism and kinetics, the study of catalyst surface states and the application of quantum chemistry in catalysis. We also provide contributions on the activation, deactivation and regeneration of homogeneous catalysts, solidified homogeneous catalysts and solidified enzyme catalysts in industrial catalytic processes, as well as on the optimisation and characterisation of catalysts for new catalytic processes. The main target readers are scientists and postgraduates working in catalysis in research institutes, industrial and mining enterprises, as well as teachers and students of chemistry and chemical engineering departments in colleges and universities. Contributions from related professionals are welcome.