Influence of Support Properties on the Activity of Basic Catalysts for Aldol Condensation of Formaldehyde and Methyl Acetate in a Continuous-Flow Reactor

Yanan Wang; Huanhui Chen; Guoqing Zhao; Min Liu; Xuewei Lang; Zhirong Zhu

doi:10.1556/jfc-d-14-00035

Journal of Flow Chemistry

Volume/Issue:: Volume 5: Issue 2

Influence of Support Properties on the Activity of Basic Catalysts for Aldol Condensation of Formaldehyde and Methyl Acetate in a Continuous-Flow Reactor

Authors:

Yanan Wang

Yanan Wang Tongji University, 1239 Siping Road, Shanghai 200092, China

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Huanhui Chen

Huanhui Chen Tongji University, 1239 Siping Road, Shanghai 200092, China

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Guoqing Zhao

Guoqing Zhao Tongji University, 1239 Siping Road, Shanghai 200092, China

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Min Liu

Min Liu Tongji University, 1239 Siping Road, Shanghai 200092, China

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Xuewei Lang

Xuewei Lang Tongji University, 1239 Siping Road, Shanghai 200092, China

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, and

Zhirong Zhu

Zhirong Zhu Tongji University, 1239 Siping Road, Shanghai 200092, China

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Pages:: 87–94

Online Publication Date:: Jun 2015

Publication Date:: 01 Jun 2015

Article Category:: Research Article

DOI:: https://doi.org/10.1556/jfc-d-14-00035

Keywords:: aldol condensation; heterogeneous catalysis; methyl acrylate; continuous-flow reaction; reactant diffusion

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The aldol condensation of methyl acetate with formaldehyde to form methyl acrylate was studied in a continuous-flow reactor using a series of supported cesium basic catalysts with commercially available materials (ZSM-5, SiO₂, and γ-Al₂O₃) as carriers prepared by vacuum impregnation. The catalysts were characterized by N₂ adsorption-desorption, Fourier transform-infrared (FT-IR), X-ray diffraction (XRD), and temperature-programmed desorption of ammonia and carbon dioxide (NH₃/CO₂-TPD). The obtained results indicated that the selectivity of methyl acrylate was mainly influenced by the properties of supports. The formation of acetone is approximately proportional to the acidity of supports. The basicity of the catalysts was favorable to the formation of methyl acrylate according to the results of CO₂-TPD. The hydrolysis of methyl acetate was inhibited over Cs-HT-SiO₂ prepared by SiO₂ after hydrothermal treatment. Furthermore, SiO₂ with the large mesoporous volume is superior to other supports, which shows the best catalytic activity for the aldol condensation reaction. On the other hand, the catalytic performance of zeolite basic catalysts was strongly influenced by the effect of reactant diffusion. Internal diffusion resulted in the increase of conversion of methyl acetate with increasing specific surface area, while the conversion of methyl acetate decreased with increasing the weight hourly space velocity (WHSV) due to the external diffusion.

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Journal of Flow Chemistry A Journal of the Flow Chemistry Society

Print ISSN:: 2062-249X

Online ISSN:: 2063-0212

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Journal of Flow Chemistry
Language	English
Size	A4
Year of Foundation	2011
Volumes per Year	1
Issues per Year	4
Founder	Áramlásos Kémiai Tudományos Társaság
Founder's Address	H-1031 Budapest, Hungary Záhony utca 7.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	2062-249X (Print)
ISSN	2063-0212 (Online)