期刊
ACS CATALYSIS
卷 10, 期 21, 页码 12370-12375出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c03257
关键词
syngas conversion; light olefins; SAPO-18; OX-ZEO; bifunctional catalysts
资金
- Ministry of Science and Technology of China [2017YFB0602201]
- Chinese Academy of Sciences [XDA21020400]
- National Natural Science Foundation of China [91645204, 91945302]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2019184]
The metal oxide-zeolite (OX-ZEO) bifunctional catalyst concept has aroused wide interest recently for direct syngas conversion. However, the mechanism of product selectivity control is far from being understood. Herein, we studied the role of acidity on the product selectivity by taking SAPO-18 as an example and physically mixing it with ZnCrOx because its Si/Al ratio can be varied in a relatively wide range. The results demonstrate a strong dependence of the product selectivity on the Si/Al ratio. Light olefin selectivity reaches as high as 81.6% with CO conversion 35.5% at Si/Al ratio = 0.011. A higher Si/Al ratio gives a stronger acid strength and higher acid density, which leads to a reduced ratio of olefins/paraffins (O/P) and an increased C-3/C-2 ratio in the products. This could be attributed to the enhanced secondary reactions of ethylene under a H-2-rich atmosphere of syngas conversion. Therefore, it is essential to control the acid strength and density of SAPO-18 in order to achieve selective synthesis of light olefins.
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