Regulation mechanism for fast pyrolysis of starch and cellulose-rich cassava residue over niobium phosphate and modified zeolites

Chengyu Li, Jun Zhang, Rui Shan, Haoran Yuan and Yong Chen

Renewable Energy, 2025, vol. 247, issue C

Abstract: In the present study, the selective pyrolysis of cassava residue into levoglucosan and aromatics catalyzed by niobium phosphate and modified ZSM-5 was systematically investigated with detailed reaction mechanism and kinetic analysis. The NbP catalyst could achieve up to 53.6 % relative content and 16.7 wt% yield of levoglucosan from catalytic pyrolysis of cassava residue at 450 °C. On the other hand, the introduction of ZSM-5 zeolite achieved sufficient incorporation with niobium phosphate and dramatically improved the selectivity towards aromatics owing to the presence of much more micropores and acid sites, and the activation energy of pyrolysis was significantly reduced. Remarkably, the niobium phosphate-modified ZSM-5 gave aromatics selectivity of 91.6 % at 650 °C, where the main aromatics yield achieved 12.3 wt%. Based on the evolution of levoglucosan, furfural, furan, levoglucosanone, benzofuran, and acyclic intermediates, the plausible pyrolytic conversion pathways for starch and cellulose from cassava residue were proposed.

Keywords: Niobium phosphate; ZSM-5; Cassava residue; Catalytic pyrolysis; Levoglucosan; Starch (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:247:y:2025:i:c:s0960148125006688

DOI: 10.1016/j.renene.2025.123006

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