Study on catalytic conversion of biomass pyrolysis volatiles over composite catalysts of activated carbon and HY zeolite

XU Ji; WU Bowen; HAN Zhen; HU Haoquan; JIN Lijun

doi:10.1016/S1872-5813(24)60447-0

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XU Ji, WU Bowen, HAN Zhen, HU Haoquan, JIN Lijun. Study on catalytic conversion of biomass pyrolysis volatiles over composite catalysts of activated carbon and HY zeolite[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(24)60447-0

Citation:

XU Ji, WU Bowen, HAN Zhen, HU Haoquan, JIN Lijun. Study on catalytic conversion of biomass pyrolysis volatiles over composite catalysts of activated carbon and HY zeolite[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(24)60447-0

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Study on catalytic conversion of biomass pyrolysis volatiles over composite catalysts of activated carbon and HY zeolite

doi: 10.1016/S1872-5813(24)60447-0

State Key Laboratory of Fine Chemicals, Institute of Coal Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

Funds: The project was supported by the National Natural Science Foundation of China (22178051) and the Fundamental Research Funds for the Central Universities (DUT21TD103).

Received Date: 2024-02-18
Accepted Date: 2024-03-28
Rev Recd Date: 2024-03-28

Available Online: 2024-04-29

Abstract

Abstract

Biomass pyrolysis tar has complex compositions and high oxygen content, which restricts its high-value utilization. In this paper, commercial activated carbon (AC) and HY zeolite were used as composite catalysts to study the effect on the pyrolysis volatiles from rice straw and poplar sawdust by changing the mixing models of two catalysts. The results showed that the loading models of AC and HY zeolite obviously affected the products distribution from biomass pyrolysis and tar components. The lowest yield of bio-oil was obtained when HY zeolite and AC were mechanically mixed at a mass ratio of 1/1 (YACM). The layered model with upper AC and lower HY zeolite (ACTYL) and YACM are beneficial to the deoxidation and aromatic hydrocarbon generation of bio-oil. Under YACM, the aromatics content in rice straw and poplar sawdust pyrolytic tar can be increased from 13.8% and 8.0% without catalyst to 56.4% and 53.1%, respectively. However, the layered loading with upper HY zeolite and lower AC (YTACL) is favorable for the formation of phenolic compounds. The selectivity to monocyclic aromatic hydrocarbons follows the order of YTACL> ACTYL>YACM, and the selectivity to bicyclic aromatic hydrocarbons is in the order of YACM> ACTYL>YTACL. AC catalyst possesses smaller pore size and fewer acidity compared with HY zeolite. The active sites of AC are conducive to the rearrangement of furan compounds to generate cyclopentanone, 2-cyclopentenone and methyl-cyclopentenone, and further rearrangement to form phenol. Therefore, the loading model of YTACL exhibits a promotion effect on the formation of phenol, cresol, toluene, ethylbenzene and p-xylene. The strong acidic sites of HY zeolite are favorable for the aromatization, so the loading model of ACTYL has good selectivity to the formation of naphthalene, methylnaphthalene, anthracene and pyrene. This work will provide a guide for the products regulation from biomass pyrolysis and enriching the aromatics and phenols in bio-oil.
- biomass,
- pyrolytic volatiles,
- catalytic upgrading,
- activated carbon,
- HY zeolite

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References(34)

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