Journal
BIORESOURCE TECHNOLOGY
Volume 261, Issue -, Pages 86-92Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.03.138
Keywords
Hemicellulose; LLDPE; Catalytic fast co-pyrolysis; Dual-catalyst bed; Upgraded bio-oil production
Funding
- National Natural Science Foundation of China [21766019]
- Key Research and Development Program of Jiangxi Province, China [20171BBF60023]
- Minnesota Environment and Natural Resources Trust Fund
- University of Minnesota Center for Biorefining
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The high concentration of oxygenated compounds in pyrolytic products prohibits the conversion of hemicellulose to important biofuels and chemicals via fast pyrolysis. Herein a dual-catalyst bed of CaO and HZSM-5 was developed to convert acids in the pyrolytic products of xylan to valuable hydrocarbons. Meanwhile, LLDPE was co-pyrolyzed with xylan to supplement hydrogen during the catalysis of HZSM-5. The results showed that CaO could effectively transform acids into ketones. A minimum yield of acids (2.74%) and a maximum yield of ketones (42.93%) were obtained at a catalyst to feedstock ratio of 2:1. The dual-catalyst bed dramatically increased the yield of aromatics. Moreover, hydrogen-rich fragments derived from LLDPE promoted the Diels-Alder reactions of furans and participated in the hydrocarbon pool reactions of non-furanic compounds. As a result, a higher yield of hydrocarbons was achieved. This study provides a fundamental for recovering energy and chemicals from pyrolysis of hemicellulose.
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