CIESC Journal ›› 2018, Vol. 69 ›› Issue (7): 3001-3008.doi: 10.11949/j.issn.0438-1157.20171632

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Effect of ultrasonic alkali treatment on structural, acidic properties and performance of MOR catalyst

HAN Haibo1,2, WANG Youhe1, LI Kang2, LIU Danhe2, HAO Daijun2, YAN Zifeng1   

  1. 1 State Key Laboratory for Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, China;
    2 Luoyang R & D Center of Technology of Sinopec Engineering(Group) CO., LTD., Luoyang 471003, Henan, China
  • Received:2017-12-12 Revised:2018-01-31 Online:2018-07-05 Published:2018-03-15
  • Supported by:

    supported by the National Natural Science Foundation of China(21776311) and the Fundamental Research Funds for the Central Universities (15CX05030A).

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Abstract:

MOR catalyst commonly suffers the poor stability in the catalytic synthesis of methyl acetate. It's difficulty to introduce the hierarchical pores by traditional alkali treatment. To overcome this drawback, an ultrasonic alkali treatment was utilized to generate hierarchical MOR via desilication. Multiple analyzing methods, such as XRD, SEM, TEM, pyridine IR and N2 adsorption-desorption, were used to characterize the catalyst structure and the influence of ultrasonic treatment under different alkali concentration on the MOR framework. Acidity, pore structure and catalytic properties were investigated. The results showed that a proper ultrasonic alkali treatment could significantly improve the number of acidic sites, mesopore volume, surface area, pore size distribution, catalytic activity and stability. The DME conversion increased from 35.3% to 44.8%, and the catalyst lifetime was greatly prolonged. However, an excessive alkali concentration seriously destroyed the MOR framework, leading to a rapid decrease on catalyst activity and stability.

Key words: ultrasonic, alkali treatment, DME carbonylation, hierarchical MOR

CLC Number: 

  • O643

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