The comparison of chemical liquid deposition and acid dealumination modified ZSM-5 for catalytic pyrolysis of pinewood using pyrolysis-gas chromatography/mass spectrometry

• Published in: Bioresource technology Vol. 244; no. Pt 1; pp. 726 - 732
• Main Authors: Zhang, Huiyan, Shao, Shanshan, Luo, Mengmeng, Xiao, Rui
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.11.2017
• Subjects: Acid dealumination; Biofuels; Biomass; Catalysis; Catalytic pyrolysis; Chemical liquid deposition; Gas Chromatography-Mass Spectrometry; Pinus; Py-GC/MS; Silicon Dioxide; Zeolites; ZSM-5; Biomass; Chemical liquid deposition; Py-GC/MS; Acid dealumination; Catalytic pyrolysis; ZSM-5
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2017.08.036

Schematic diagram of the modified ZSM-5 catalysts by CLD and AD in catalytic pyrolysis of pinewood. [Display omitted] •ZSM-5 was modified by chemical liquid deposition (CLD) and acid dealumination (AD).•CLD led to the blockage of pores, and AD increased the average pore size.•ZSM-5 by CLD showed a higher yield of benzene, toluene and xylene, boosted by 37.2%.•ZSM-5 by CLD decreased half for indenes and naphthalenes yields.•CLD was a preferable method in CFP of biomass for petrochemicals. Catalyst deactivation is the main reason for low petrochemical yield in catalytic fast pyrolysis (CFP) of biomass. ZSM-5 catalysts modified by chemical liquid deposition (CLD) and acid dealumination (AD) were prepared to improve petrochemical yields for CFP of pinewood. The results showed that CLD by SiO2 led to the coverage of strong acid sites, while AD favored the removal of superficial acid sites. CFP of pinewood showed that the relative area ratio of BTX was boosted by 37.2% and 30.4% over modified ZSM-5 catalysts by CLD and AD, respectively. The yield of indenes and naphthalenes which were important precursors of heavy coke decreased sharply. Considering environmental cost and catalytic performance, CLD seems to be a preferable modification method over ZSM-5 in the catalytic pyrolysis of biomass for petrochemicals.