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<p>In order to increase the yield of high-value components in bio-oil from waste wood-based panels (WWPs), a composite catalyst of SiC@HZSM-5 with both excellent capacities of microwave absorption and catalytic conversion was successfully prepared and applied to the microwave-assisted pyrolysis (MAP) with microwave power of 1000 W (2.45&#xa0;GHz). The effects of different Si/Al ratios of HZSM-5 on the characterization of catalysts and selective pyrolysis products also have been investigated. The results showed that the obtained SiC@HZSM-5 catalyst exhibited a stable composite structure, favorable dielectric loss characteristics, and high thermal conductivity. Compared with the non-catalytic experiment, SiC@HZSM-5 catalysts significantly enhanced the relative content of nitrogen-containing compounds and reduced the concentration of oxygen-containing compounds in bio-oil, though there was one slight negative impact on bio-oil yield. Importantly, with the increase in Si/Al ratio from 30 to 90, the production of nitrogen-containing compounds was found to decrease from 37.11 to 23.14%, due to the reduction of acidic sites in catalysts. It was noteworthy that during the pyrolysis of WWPs by microwave heating, the catalyst with the Si/Al ratio of 30 significantly promoted the interactions between lignocellulosic components and adhesives and improved the selectivity of amide-N compounds (14.06%, acetamide being the main products) and heterocyclic-N compounds (23.05%, pyrroles, pyridines, and pyrazines constituted the major composition). This work could offer a promising technical reference to thermally converted WWPs to high value-added chemicals by microwave-assisted catalytic pyrolysis (MACP).</p>

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Effect of SiC@HZSM-5 catalyst on the selective conversion of waste wood-based panels by microwave-assisted pyrolysis

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Yong Cui,
  • Wenliang Wang,
  • Xiaolu Xu,
  • Hui Miao,
  • Yishuai Fu

摘要

In order to increase the yield of high-value components in bio-oil from waste wood-based panels (WWPs), a composite catalyst of SiC@HZSM-5 with both excellent capacities of microwave absorption and catalytic conversion was successfully prepared and applied to the microwave-assisted pyrolysis (MAP) with microwave power of 1000 W (2.45 GHz). The effects of different Si/Al ratios of HZSM-5 on the characterization of catalysts and selective pyrolysis products also have been investigated. The results showed that the obtained SiC@HZSM-5 catalyst exhibited a stable composite structure, favorable dielectric loss characteristics, and high thermal conductivity. Compared with the non-catalytic experiment, SiC@HZSM-5 catalysts significantly enhanced the relative content of nitrogen-containing compounds and reduced the concentration of oxygen-containing compounds in bio-oil, though there was one slight negative impact on bio-oil yield. Importantly, with the increase in Si/Al ratio from 30 to 90, the production of nitrogen-containing compounds was found to decrease from 37.11 to 23.14%, due to the reduction of acidic sites in catalysts. It was noteworthy that during the pyrolysis of WWPs by microwave heating, the catalyst with the Si/Al ratio of 30 significantly promoted the interactions between lignocellulosic components and adhesives and improved the selectivity of amide-N compounds (14.06%, acetamide being the main products) and heterocyclic-N compounds (23.05%, pyrroles, pyridines, and pyrazines constituted the major composition). This work could offer a promising technical reference to thermally converted WWPs to high value-added chemicals by microwave-assisted catalytic pyrolysis (MACP).