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

Direct synthesis of isoalkanes from syngas over ZnCrOx/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)

  • ZnCrOx composite oxide and HZSM-5 zeolite were prepared by using the coprecipitation and hydrothermal methods, respectively; after that, a bi-functional ZnCrOx/HZSM-5 catalyst was obtained through physical mixing of ZnCrOx with HZSM-5 and used in the direct synthesis of isoalkanes from syngas. The ZnCrOx/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 ZnCrOx to HZSM-5 (OX/ZEO mass ratio) on the catalytic performance of ZnCrOx/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 ZnCrOx components in the bifunctional catalyst without losing CO conversion. For the syngas conversion over ZnCrOx/HZSM-5 catalyst under the conditions of 400 ℃, 2.0 MPa, gas hourly space velocity (GHSV) of 3600 mL/(h·gcat), 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.
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