Effect of Si/Al ratio of HZSM-5 zeolites on catalytic upgrading of coal pyrolysis volatiles

WANG De-liang; CHEN Zhao-hui; YU Jian; GAO Shi-qiu

doi:10.1016/S1872-5813(21)60030-0

Volume 49 Issue 5

May 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(5): 634-640

WANG De-liang, CHEN Zhao-hui, YU Jian, GAO Shi-qiu. Effect of Si/Al ratio of HZSM-5 zeolites on catalytic upgrading of coal pyrolysis volatiles[J]. Journal of Fuel Chemistry and Technology, 2021, 49(5): 634-640. doi: 10.1016/S1872-5813(21)60030-0

Citation:

WANG De-liang, CHEN Zhao-hui, YU Jian, GAO Shi-qiu. Effect of Si/Al ratio of HZSM-5 zeolites on catalytic upgrading of coal pyrolysis volatiles[J]. Journal of Fuel Chemistry and Technology, 2021, 49(5): 634-640. doi: 10.1016/S1872-5813(21)60030-0

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Effect of Si/Al ratio of HZSM-5 zeolites on catalytic upgrading of coal pyrolysis volatiles

doi: 10.1016/S1872-5813(21)60030-0

WANG De-liang^{1, 2
,},
CHEN Zhao-hui¹,
YU Jian¹,
GAO Shi-qiu^{1
,
,}

1.
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
2.
Sinopec Economics & Development Research Institute Company Limited, Beijing 100029, China

Funds: The project was supported by the National Key Research and Development Program of China (2016YFB0600304) and the National Natural Science Foundation of China (21878310)

Received Date: 2020-12-22
Rev Recd Date: 2021-01-14

Available Online: 2021-03-30

Publish Date: 2021-05-28

Abstract

Abstract

The effects of SiO₂/Al₂O₃ ratio of HZSM-5 on the tar quality and coke formation during catalytic upgrading of coal pyrolysis volatiles were investigated. The results showed that the carbon deposition amount decreased with the increase of the SiO₂/Al₂O₃ ratio of HZSM-5 due to the decrease of strong and weak acid amount. When the SiO₂/Al₂O₃ ratio increased from 23 to 310, the carbon deposition amount decreased from 120.1 mg/g-catalyst to 23.9 mg/g-catalyst. Moreover, the higher ratio of strong and weak acid amount led to lighter fraction in tar. With the decrease of SiO₂/Al₂O₃ ratio, the acid strength was enhanced so that the aromatics content in the tars decreased, indicating that the stronger acidic sites promoted the dehydrogenation, cyclization and aromatization reactions of volatiles, thus leading to higher yield of aromatics during catalytic coal pyrolysis.
- zeolite,
- acidity,
- coal pyrolysis,
- catalytic upgrading,
- coke deposition

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References(22)

References

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