Catalytic fast pyrolysis of bamboo sawdust via a two-step bench scale bubbling fluidized bed/fixed bed reactor: Study on synergistic effect of alkali metal oxides and HZSM-5

Jia Wang, Zhaoping Zhong, Kuan Ding, Aidong Deng, Naijia Hao, Xianzhi Meng, Haoxi Ben, Roger Ruan, Arthur J. Ragauskas

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Catalytic fast pyrolysis of bamboo sawdust was conducted by a tandem bubbling fluidized bed/fixed bed reactor. Effect of pyrolysis and catalyst temperatures on product yield was studied. In addition, synergistic effect of HZSM-5 and base catalysts (including CaO, MgO, and SrO) for the promotion of aromatic hydrocarbons was revealed. Experimental results illustrated that both pyrolytic and catalytic reactor temperatures played pivotal roles in the yield of bio-oil, and the optimal pyrolysis and catalytic reactor temperatures were 550 °C and 500 °C, respectively. Ex-situ catalytic trial decreased the yield of bio-oil compared to in-situ run, while it facilitated the formation of phenol and alkylphenols. Mixed catalytic upgrading modes exhibited more significant aromatization and deoxygenation activities than sequential ones. In particular, ex-situ run using CaO mixed with HZSM-5 increased the concentration of aromatic hydrocarbons to 31.34%, which was ∼11.48% higher than that derived from CaO and HZSM-5 sequentially processed mode. The dominated products in alkylphenols were cresol isomers and ethylphenols, and compared to sequential cases, mixed catalytic upgrading trials promoted the relative selectivity of phenol. Synergistic effect of base catalysts and HZSM-5 contributed to the production of monocyclic aromatic hydrocarbons, and CaO mixed with HZSM-5 mode showed the most prominent synergistic effect for the enhanced relative selectivity to xylenes and toluene.

Original languageEnglish (US)
Pages (from-to)287-298
Number of pages12
JournalEnergy Conversion and Management
Volume176
DOIs
StatePublished - Nov 15 2018

Bibliographical note

Funding Information:
The authors are grateful for the National Natural Science Fund Program of China (No. 51776042 ), the Scientific Research Foundation of Graduate School of Southeast University ( YBJJ1646 ), the Scientific Innovation Research Program of College Graduate in Jiangsu Province ( KYLX16_0204 ) as well as the Financial Support from the Program of China Scholarships Council (No. 201706090032 ).

Publisher Copyright:
© 2018 Elsevier Ltd

Keywords

  • Bamboo sawdust
  • Base catalysts
  • Catalytic fast pyrolysis
  • HZSM-5
  • Synergistic effect

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