Volume 51 Issue 8
Aug.  2023
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CAI Wei, HUANG Ming, ZHU Liang, ZHENG Yu-bo, CAI Bo, MA Zhong-qing. Enhancement of the production of light aromatics from poplar wood by combined approach of wet torrefaction pretreatment and catalytic fast pyrolysis using metal modified hierarchical zeolite[J]. Journal of Fuel Chemistry and Technology, 2023, 51(8): 1126-1136. doi: 10.19906/j.cnki.JFCT.2023004
Citation: CAI Wei, HUANG Ming, ZHU Liang, ZHENG Yu-bo, CAI Bo, MA Zhong-qing. Enhancement of the production of light aromatics from poplar wood by combined approach of wet torrefaction pretreatment and catalytic fast pyrolysis using metal modified hierarchical zeolite[J]. Journal of Fuel Chemistry and Technology, 2023, 51(8): 1126-1136. doi: 10.19906/j.cnki.JFCT.2023004

Enhancement of the production of light aromatics from poplar wood by combined approach of wet torrefaction pretreatment and catalytic fast pyrolysis using metal modified hierarchical zeolite

doi: 10.19906/j.cnki.JFCT.2023004
Funds:  The project was supported by the Key R & D Program of Zhejiang Province (2022C03092), Natural Science Foundation of Zhejiang Province (LY21E060001), the Fundamental Research Funds for the Provincial Universities of Zhejiang (2020YQ006), the Youth Talent Support Program by National Forestry and Grassland Administration (2019132617), the Open Foundation from the State Key Laboratory of Clean Energy Utilization (ZJU-CEU2020021)
  • Received Date: 2022-11-17
  • Accepted Date: 2022-12-30
  • Rev Recd Date: 2022-12-29
  • Available Online: 2023-01-10
  • Publish Date: 2023-08-01
  • Light aromatics are extremely important building blocks in the chemical industry which can be produced from the catalytic fast pyrolysis (CFP) of biomass. In this work, wet torrefaction pretreatment (WTP) was employed to improve the quality of poplar wood (PW) in terms of the synergetic deoxygenation and demineralization. Then, metal-modified hierarchical HZSM-5 was prepared by the combined approach of NaOH desilication pretreatment and metal (Zn, Ga, and Fe) modification. At last, the CFP of torrefied PW was carried out by using the metal-modified hierarchical HZSM-5 as catalyst to produce light aromatics. Results showed that the deoxygenation and demineralization rates gradually increased with the increase of WTP temperature from 180 to 260 ℃, the maximum removal rates of oxygen, K, Mg, Ca, and Na were 47.96%, 90.99%, 86.65%, 66.09%, and 36.29%, respectively. NaOH desilication pretreatment and metal modification on HZSM-5 promoted the formation of light aromatics. The Zn-modified hierarchical HZSM-5 presented the highest yield of light aromatics. The yield of aromatics increased first with the raise of catalyst-to-torrefied PW ratio from 1:1 to 1∶3, then decreased slightly at the highest catalyst-to-torrefied PW ratio of 1∶5. At last, the operation parameter of WTP and CFP was optimized which the maximum yield of light aromatics was 7.83 × 107 p.a./mg at WTP temperature of 220 ℃, catalyst-to-biomass ratio of 3∶1, and CFP temperature of 850 ℃.
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