Journal
FUEL PROCESSING TECHNOLOGY
Volume 230, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.fuproc.2022.107201
Keywords
Lignin; Catalytic fast pyrolysis; HZSM-5 zeolite; Transition metal modification; Monocyclic aromatic hydrocarbons
Funding
- National Key Research and Development Plan of China [2018YFE0125200]
- National Natural Science Foundation of China [21978225, 51861145102, 51906076]
- Guangdong Provincial Science and Technology Project [2019A050510031]
- Science and Technology Program of Shenzhen [JCYJ20180302153928437, JCYJ20190808150418994]
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development [E039kf0401]
- Fundamental Research Fund for the Central Universities [2042021kf0209, 2042021kf0027]
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This study investigated the feasibility of using metal-modified HZSM-5 zeolite as catalysts for monocyclic aromatic hydrocarbons production in lignin catalytic pyrolysis. The 1%Co-HZ catalyst showed excellent performance and resistance to carbon deposition.
This work aimed to investigate the feasibility of using metal-modified (Fe, Co, Ni, Cu, Zn, Ga) HZSM-5 zeolite as catalysts for high-value monocyclic aromatic hydrocarbons production via lignin catalytic pyrolysis in a two-stage fixed bed reactor. The structure-performance relationship of the catalysts was revealed based on the cat-alytic reaction testing results along with the acidity and textural properties obtained via systematic physico-chemical characterization techniques, thus guiding the selection of the best modification metal and the optimal loading amount. As demonstrated, the 1 wt% Co modified HZSM-5 (1%Co-HZ) exhibited relatively slight coverage effect on the active sites, while increased the mesoporous surface area and average pore size of the parent HZSM-5 zeolite. Consequently, enhanced mass-transfer efficiency was attained by the 1%Co-HZ catalyst, which achieved the highest monocyclic aromatic hydrocarbons content (29.3%) among all the investigated metal-modified HZSM-5 catalysts. In addition, the Co modified sample showed better resistance to carbon deposition than that of the unmodified one. Overall, 1%Co-HZ can be used as an effective catalyst for monocyclic aromatic hydrocarbons production in lignin catalytic pyrolysis.
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