Modification of Hydrogen Zeolite with CeO₂ and its Catalysis Application for Preparing Aspirin

Abstract:

Hydrogen zeolite was modified with CeO₂ by impregnation - filtration - heat treatment. Hydrogen-zeolite samples before and after modification were characterized by XRD and SEM. The catalytic efficiency of modified hydrogen-zeolite was investigated. Such modification conditions were explored: as the CeO₂ percentage, calcination temperature, calcination time, impregnation temperature. The results show that the optimal CeO₂ percentage is 0.5%, calcination temperature is 600°C, calcination time is 2h, impregnation temperature is 75°C. The aspirin yield reaches 78.3% under the optimal conditions, compared with that (64.8%) catalyzed by sulfuric acid and that (70.4%) catalyzed by unmodified zeolite. XRD, SEM characterizations show that Ce ions can be doped into the zeolite framework. And the modification makes the zeolite particle size become smaller, which is reduced to 50.5nm from 56.76nm. A high efficient and eco-enviromently catalyst was got by modification.

• Periodical: Materials Science Forum (Volumes 809-810)
• Pages: 884-889
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.809-810.884
• Online since: December 2014
• Authors: Zhen Tan, Hui Ying Chen*, Bi Hao Lan, Xiang Wen Tong, Xiao Mei Ba
• Keywords: Aspirin Catalysis, CeO₂, Hydrogen Zeolite, Modification

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