Abstract To solve the problems of complicated compounds and high oxygen content in pyrolysis bio-oil, Fe-modified ZSM-5 catalysts (wet-impregnation, SiO2/Al2O3 ratio: 30, 40, 50 and 60, Fe loading rate: 2 wt%, 4 wt%, 6 wt%, and 8 wt%) were prepared and employed to improve the selection of aromatics using Py-GC/MS and to investigate the kinetics of corn stalk catalytic pyrolysis by TGA tests and Friedman isoconversional kinetics method. Results revealed that the highest yields of aromatics were obtained using Fe/ZSM-5 with a Si/Al ratio of 40 and Fe loading rate of 4 wt%, which was 38.28%. The existence of Fe on ZSM-5 leads to an increase of monocyclic aromatics compared with parent ZSM-5. Effective activation energies for the catalytic pyrolysis of corn stalk over Fe(4)/ZSM-5(40) were decreased to 146.47–299.63 kJ mol−1 compared with non-catalyst. This work can provide a reference for future studies on biomass catalytic pyrolysis.

中文翻译：

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Fe改性ZSM-5的SiO2/Al2O3比和Fe负载率对芳烃选择和玉米秸秆催化热解动力学的影响

摘要 为解决热解生物油中化合物复杂、含氧量高的问题，采用Fe改性ZSM-5催化剂（湿法浸渍，SiO2/Al2O3比：30、40、50和60，Fe负载率：2 wt%制备并使用 4 wt%、6 wt% 和 8 wt%) 以改进使用 Py-GC/MS 的芳烃选择，并通过 TGA 测试和 Friedman 等转化动力学方法研究玉米秸秆催化热解的动力学。结果表明，使用 Fe/ZSM-5 获得最高的芳烃收率，Si/Al 比为 40，Fe 负载率为 4 wt%，为 38.28%。与母体 ZSM-5 相比，ZSM-5 上 Fe 的存在导致单环芳烃的增加。与非催化剂相比，Fe(4)/ZSM-5(40) 催化热解玉米秸秆的有效活化能降低至 146.47–299.63 kJ mol-1。