Effects of crystallization time on the catalysis of Cs-La/SBA-15 for aldol condensation of methyl propionate and formaldehyde

doi:10.7523/j.issn.2095-6134.2016.06.004

Abstract

Abstract:

Aldol condensation of methyl propionate (MP) and formaldehyde (FA) is a green and sustainable route to synthesize methyl methacrylate (MMA). The key to the route is to develop effective catalysts, and the supports of catalysts play an important role in the catalytic performance. SBA-15 with different crystallization time was synthesized by the hydrothermal method and the Cs-La/SBA-15 catalysts were prepared by wetness impregnation method. The catalysts were characterized by XRD, SEM, IR, BET, TPD, etc. The effect of crystallization time of SBA-15 on the catalytic performance of Cs-La/SBA-15 for aldol condensation was studied. The results showed that regular mesoporous materials with 2D-hexogonal rod-like structure were obtained when the crystallization time was more than 24 h. The Cs-La/24SBA-15 (with SBA-15 crystallized 24 h) exhibited higher catalytic activity than the other catalysts because of the higher density of medium base sites as well as the great surface area of SBA-15 (around 1 000 m²/g) and uniform pore size (6 nm). When the MP/FA=1/1, the conversion of MP is 30.9% and the selectivity of MMA reachs 90.3%.

Key words: crystallization time, catalysts, aldol condensation

CLC Number:

TQ225.24

WANG Yanan, YAN Ruiyi, LI Zengxi. Effects of crystallization time on the catalysis of Cs-La/SBA-15 for aldol condensation of methyl propionate and formaldehyde[J]. , 2016, 33(6): 741-747.

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