Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (11): 1762-1769.DOI: 10.1016/S1872-2067(18)63145-6

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HZSM-35 zeolite catalyzed aldol condensation reaction to prepare acrylic acid and its ester:Effect of its acidic property

Zhanling Maa,b,c, Xiangang Maa, Youming Nia, Hongchao Liua, Wenliang Zhua, Xinwen Guob, Zhongmin Liua   

  1. a National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b State Key Laboratory of Fine Chemicals, PSU-DUT Joint center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-06-21 Revised:2018-07-16 Online:2018-11-18 Published:2018-09-01
  • Contact: 10.1016/S1872-2067(18)63145-6

Abstract:

Acrylic acid (AA) and its ester, methyl acrylate (MA), were produced by a green one-step aldol condensation reaction of dimethoxymethane and methyl acetate. The reaction was conducted over ZSM-35 zeolites with different concentrations of Brönsted acid, which were prepared by the sodium ion-exchange process with H-form zeolite. The acidic property of HZSM-35 was studied in detail through infrared experiments. About 51% of all bridging OH groups were distributed in cages, while 23% and 26%, respectively, were distributed in 10-and 8-ring channels. The catalytic performance was enhanced by a high concentration of Brönsted acid, indicating that Brönsted acid is an active site for the aldol condensation reaction. The ZSM-35 zeolite possessing a concentration of Brönsted acid as high as 0.049 mmol/g demonstrated excellent performance with a MA+AA selectivity of up to 73%.

Key words: Aldol condensation, Methyl acetate, ZSM-35 zeolite, Brönsted acid, Acrylic acid