Improving hydrocarbon yield from catalytic fast co-pyrolysis of hemicellulose and plastic in the dual-catalyst bed of CaO and HZSM-5

Kuan Ding, Zhaoping Zhong, Jia Wang, Bo Zhang, Liangliang Fan, Shiyu Liu, Yunpu Wang, Yuhuan Liu, Daoxu Zhong, Paul Chen, Roger Ruan

Research output: Contribution to journalArticlepeer-review

101 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)86-92
Number of pages7
JournalBioresource Technology
Volume261
DOIs
StatePublished - Aug 2018

Bibliographical note

Funding Information:
This research is supported by in part by the National Natural Science Foundation of China ( 21766019 ), the Key Research and Development Program of Jiangxi Province ( 20171BBF60023 ), China, the Minnesota Environment and Natural Resources Trust Fund as recommended by the Legislative‐Citizen Commission on Minnesota Resources (LCCMR), and the University of Minnesota Center for Biorefining.

Publisher Copyright:
© 2018 Elsevier Ltd

Keywords

  • Catalytic fast co-pyrolysis
  • Dual-catalyst bed
  • Hemicellulose
  • LLDPE
  • Upgraded bio-oil production

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