Journal
CHINESE JOURNAL OF CATALYSIS
Volume 42, Issue 12, Pages 2197-2205Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(20)63770-6
Keywords
Pore-mouth catalysis; Shape-selective catalysis; Bifunction; Syngas; Gasoline
Funding
- National Key Research and Development Program of Ministry of Science and Technology [2020YFB0606401, 2019YFE0104400]
- National Natural Science Foundation of China [91945301, 22072120, 21972116, 22008203]
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Recent studies have shown that bifunctional catalysts composed of metal oxide and zeolites can convert syngas into high-quality gasoline directly. SAPO-11 catalyst favors the formation of iso-paraffins through a pore-mouth catalysis mechanism.
Recent studies confirm that the emerging bifunctional catalysts consisting of metal oxide and zeolites can directly convert syngas into high-quality gasoline, however, the formation mechanism of iso-paraffins and the difference with the conventional FT/zeolite catalyst have not been investigated. Herein, three one-dimensional SAPO zeolites with diverse micropore sizes were synthesized and assembled with ZnAlOx with spinel structure. It was found that ZnAlOx/SAPO-41 and ZnAlOx/SAPO-11 with medium micropore sizes favored the formation of C-5-C-11 hydrocarbons with a high content of iso-paraffins. The characterizations pointed out that the formation of iso-paraffins over SAPO-11 followed a pore-mouth catalysis mechanism, which means the isomerization of linear hydrocarbons can only take place near the pore mouth region of zeolites. This mechanism only allows the formation of mono-branched iso-paraffins in the C-5-C-11 range, which are less prone to be cracked than their di-branched isomers. A careful comparative analysis between ZnAlOx/SAPO-11 and Co/H-meso-ZSM-5 was also made in terms of product distribution, activity, and stability. (c) 2021, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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