Catalytic Pyrolysis of Biomass Over Fe-Modified Hierarchical ZSM-5: Insights into Mono-Aromatics Selectivity and Pyrolysis Behavior Using PY-GC/MS and TG-FTIR

EnergyRN EM Feeds Pub Date : 2021-12-01 DOI:10.2139/ssrn.3872438

Yingkai Li, N. Nishu, Dominic Yellezuome, Meiyun Chai, Chong Li, Ronghou Liu

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引用次数: 26

Abstract

Abstract Catalytic pyrolysis has recently aroused great interest for the high potential in upgrading bio-oils as renewable energy. However, conventional catalysts often exert diffusion resistance to large intermediate oxygenates. In this study, Fe-modified hierarchical ZSM-5 prepared by alkali and Fe loading of 2, 4, 6, 8 wt% were characterized by the analysis of XRD, BET, TEM, and NH3-TPD. Catalytic pyrolysis of poplar sawdust via Fe-modified hierarchical ZSM-5 was conducted using Py-GC/MS and TG-FTIR. The results indicated that alkali treatment and Fe loading of the catalyst introduced a hierarchical and porous structure and improved its acidity, leading to high mono-aromatics and olefins selectivity. The hierarchical ZSM-5 with 4 wt% Fe loading exhibited superior performance with high selectivity towards mono-aromatics of 15.30%. TG-FTIR analysis shows the volatiles release characteristics and FTIR spectra were consistent with pyrolysis behavior. Kinetic analysis reveals Fe-modified hierarchical ZSM-5 lowers the apparent activation energy in catalytic pyrolysis of poplar sawdust.

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fe改性ZSM-5催化热解生物质:利用PY-GC/MS和TG-FTIR研究单芳烃选择性和热解行为

摘要催化热解作为一种具有巨大潜力的可再生能源，近年来引起了人们的广泛关注。然而，传统的催化剂往往对大的中间氧化物产生扩散阻力。本文通过XRD、BET、TEM和NH3-TPD等分析手段，对碱、载铁量分别为2、4、6、8 wt%制备的Fe改性层次化ZSM-5进行了表征。采用Py-GC/MS和TG-FTIR对fe改性ZSM-5催化热解杨木木屑进行了研究。结果表明，碱处理和载铁使催化剂具有层次性和多孔性结构，提高了催化剂的酸度，提高了对单芳烃和烯烃的选择性。负载铁重量为4 wt%的分级ZSM-5对单一芳烃的选择性为15.30%，表现出优异的性能。TG-FTIR分析表明，挥发分释放特征和FTIR光谱与热解行为一致。动力学分析表明，fe修饰的分级ZSM-5降低了杨木木屑催化热解的表观活化能。

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