Direct synthesis of isoalkanes from syngas over ZnCrO<sub><i>x</i></sub>/HZSM-5 catalyst

WANG Sheng; HUANG Zhen; FANG Yue; QIN Feng; XU Hua-long; SHEN Wei

Volume 46 Issue 10

Oct. 2018

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Article Navigation > Journal of Fuel Chemistry and Technology > 2018 > 46(10): 1218-1224

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.

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.

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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

Funds:

the National Science and Technology Key Project of China 2017YFB0602204

the Ministry of Science and Technology of China 91645201

the Shanghai Science and Technology Committee 14DZ2273900

More Information

Corresponding author: SHEN Wei, E-mail:wshen@fudan.edu.cn
Received Date: 2018-04-02
Rev Recd Date: 2018-07-06

Available Online: 2021-01-23

Publish Date: 2018-10-10

Abstract

Abstract

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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References(13)

References

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