Citation: XIE Wen-jie, WANG Huan, QIN Yu-cai, ZHAI Peng, SONG Li-juan. Determination of mass transfer behavior of typical products of MTO (methanol to olefins) reactions over HZSM-5 zeolite[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(6): 713-722. shu

Determination of mass transfer behavior of typical products of MTO (methanol to olefins) reactions over HZSM-5 zeolite

XIE Wen-jie ¹ ,
WANG Huan ^1,2 ,
QIN Yu-cai ^1,, ,
ZHAI Peng ¹ ,
SONG Li-juan ^1,2,,

1.
Key Laboratory of Petrochemical Catalytic Science and Technology, Liaoning ShiHua University, Fushun 113001, China
2.
College of Chemistry and Chemical Engineering, China University of Petroleum(East China), Qingdao 266555, China

Corresponding author: QIN Yu-cai, qycgryx@163.com SONG Li-juan, lsong56@263.net
Received Date: 13 February 2020
Revised Date: 31 March 2020

Fund Project: Scientific Research Project of Education Department of Liaoning Province L2019035the National Natural Science Foundation of China U1662135China National Petroleum Corporation KYWX-18-011the National Natural Science Foundation of China 21902068The project was supported by the National Natural Science Foundation of China(21902068, U1662135), Scientific Research Project of Education Department of Liaoning Province(L2019035) and China National Petroleum Corporation(KYWX-18-011)

Figures(9)

Methanol conversion to olefins (MTO) catalyzed by zeolite catalysts is a typical diffusion dominated reaction process. In this paper, the diffusion behavior of several typical product molecules (ethylene/ethane, propylene/propane, benzene) on a HZSM-5 zeolite was systematically studied by using Frequency Response method. The results show that the mass transfer regularity of the product molecules have been successfully determined by the Frequency Response method. It is confirmed that the diffusion rates of C2 and C3 hydrocarbon molecules within the HZSM -5 micropores are similar, but the effects of the surface resistance are different. So, the C2 molecules can freely go in and out of the channels of the HZSM-5 zeolite, while the diffusion of C3 molecules is significantly affected by the channel diffusion limitation. In addition, the diffusion rate of benzene molecules is observably lower than that of C2 and C3 molecules, and the resistant effects of benzene molecules caused by the zeolite crystal surface are not serious. The conclusions obtained in this study can be used to explain the product selectivity of MTO reaction over HZSM-5 zeolites and the coking mechanism of the catalyst, and provide the mass transfer theoretical guidance for the preparation of the MTO catalysts with excellent performance.
- HZSM-5,
- methanol conversion,
- mass transfer behavior,
- frequency response method,
- surface barrier
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