Citation: HUANG Hui-wen, ZHANG Min-xiu, Chen CHEN, LI Chun-yi, CUI Qiu-kai. Catalytic performance of cerium modified Silicalite-1 molecular sieves in the conversion of methanol to propene[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(12): 1485-1493. shu

Catalytic performance of cerium modified Silicalite-1 molecular sieves in the conversion of methanol to propene

1.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum(East China), Qingdao 266580, China
2.
Dagang Petrochemical Company, Petro China Corporation, Tianjin 300280, China

Corresponding author: LI Chun-yi, chuyli@upc.edu.cn
Received Date: 16 August 2016
Revised Date: 20 September 2016

Figures(6)

A series of cerium modified Silicalite-1 molecular sieves were prepared by incipient wetness impregnation and used as the catalysts in the conversion of methanol to propene (MTP). The cerium modified Silicalite-1 catalysts were characterized by X-ray diffraction (XRD), N₂ sorption, pyridine adsorption Fourier transform infrared spectroscopy (Py-FTIR) and temperature-programmed desorption of NH₃ (NH₃-TPD); their catalytic performance in MTP was evaluated in a continuous flow fixed-bed micro-reactor at atmospheric pressure and 450℃, with a methanol weight hourly space velocity (WHSV) of 9.6 h^-1. The results showed that Silicalite-1 exhibits superior catalytic performance in MTP in terms of catalytic stability and selectivity to propene, in comparison with the HZSM-5 zeolite with a SiO₂/Al₂O₃ molar ratio of 200. The introduction of Ce can effectively adjust the acid properties and pore structure of Silicalite-1; modification with an appropriate concentration of Ce can reduce the amount of strong acid sites and then enhance the catalytic performance of Silicalite-1 in MTP. Over the cerium modified Silicalite-1 with a CeO₂ content of 5.0%, the selectivity to propene is increased from 31.9% to 38.2% and the catalytic lifetime is extended from 51 to 72 h, in comparison with those over the parent Silicalite-1.
- methanol,
- propene,
- Silicalite-1,
- cerium,
- acidity
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