Citation: WANG Sheng, HUANG Zhen, FANG Yue, QIN Feng, XU Hua-long, SHEN Wei. Direct synthesis of isoalkanes from syngas over ZnCrO_x/HZSM-5 catalyst[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(10): 1218-1224. shu

Direct synthesis of isoalkanes from syngas over ZnCrO_x/HZSM-5 catalyst

Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433, China

Corresponding author: SHEN Wei, wshen@fudan.edu.cn
Received Date: 2 April 2018
Revised Date: 6 July 2018

Fund Project: the Shanghai Science and Technology Committee 14DZ2273900the Ministry of Science and Technology of China 91645201the National Science and Technology Key Project of China 2017YFB0602204The project was supported by the National Science and Technology Key Project of China (2017YFB0602204), the Ministry of Science and Technology of China (91645201) and the Shanghai Science and Technology Committee (14DZ2273900)

Figures(6)

ZnCrO_x composite oxide and HZSM-5 zeolite were prepared by using the coprecipitation and hydrothermal methods, respectively; after that, a bi-functional ZnCrO_x/HZSM-5 catalyst was obtained through physical mixing of ZnCrO_x with HZSM-5 and used in the direct synthesis of isoalkanes from syngas. The ZnCrO_x/HZSM-5 catalyst was characterized by XRD, TEM, N₂ sorption, and NH₃-TPD and the effects of Si/Al ratio in HZSM-5 and the mass ratio of ZnCrO_x to HZSM-5 (OX/ZEO mass ratio) on the catalytic performance of ZnCrO_x/HZSM-5 in syngas conversion were investigated. The results indicated that with the increase of Si/Al ratio in HZSM-5, the catalyst acid density is decreased, resulting in a lower CO conversion but higher selectivity to C₅₊ products and higher isoparaffin fraction. Moreover, the selectivity to C₅₊ products is significantly increased by increasing the proportion of ZnCrO_x components in the bifunctional catalyst without losing CO conversion. For the syngas conversion over ZnCrO_x/HZSM-5 catalyst under the conditions of 400 ℃, 2.0 MPa, gas hourly space velocity (GHSV) of 3600 mL/(h·g_cat), the conversion of syngas reaches 35%, with a selectivity of 44% to C₅₊ products and an isopentane fraction up to 65% in the C₅₊ products.
- bifunctional catalyst,
- syngas,
- acid-catalyzed,
- isopentane
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Direct synthesis of isoalkanes from syngas over ZnCrOx/HZSM-5 catalyst

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通讯作者: 陈斌, bchen63@163.com

Direct synthesis of isoalkanes from syngas over ZnCrO_x/HZSM-5 catalyst