催化剂与催化方式对生物质/塑料共热解的影响

›› 2023, Vol. 37 ›› Issue (4): 86-94.

催化剂与催化方式对生物质/塑料共热解的影响

罗冠群¹,王卫民²,汤元君²,李璇²,陶轩¹

1. 浙大城市学院
2. 浙江科技学院机械与能源工程学院能源与环境系统工程系

收稿日期:2022-12-22 修回日期:2023-01-28 出版日期:2023-04-26 发布日期:2023-04-26
基金资助:
国家自然科学基金青年科学基金项目

Effects of catalyst and catalytic mode on co?pyrolysis characteristics of biomass and plastics

Received:2022-12-22 Revised:2023-01-28 Online:2023-04-26 Published:2023-04-26

摘要/Abstract

摘要： 首先使用HZSM-5作为催化剂，探究原位与异位催化方式对生物质与塑料共热解过程的影响。之后对HY、HZSM-5和Fe/HZSM-5 3种催化剂进行全面表征，进一步对比研究三者对生物质与塑料共热解过程的影响，并对3种催化剂积炭失活行为进行了分析。结果表明，原位催化生物油产率高于异位催化，但是异位催化方式强化了“双烯合成”和芳构化等反应，显著提升了芳烃的选择性，高达82.8 %。过渡金属Fe的引入提高了催化剂抑制积炭的能力，Fe/HZSM-5催化剂结焦量远少于HY和HZSM-5催化剂，仅为3.77 %。同HZSM-5相比， Fe/HZSM-5中Br?nsted酸强度减弱，略微降低了碳氢化合物的选择性，但是将碳氢化合物中芳烃的选择性提高了16.7 %。由于焦炭的附着，反应后的催化剂比表面积、孔容和酸强度均有所降低，进而降低了其催化活性。

关键词: 生物质, 塑料, 共热解, 催化方式, 失活

Abstract: Catalytic co-pyrolysis of biomass and plastic is a promising way to improve bio-oil quality and mitigate the environmental issues caused by the disposal of petroleum-based waste plastics. In this study， the effects of in-situ and ex-situ catalytic modes on the performance of co-pyrolysis were investigated using HZSM-5 as a catalyst. Three types of catalysts， HY， HZSM-5 and Fe/HZSM-5， were then thoroughly characterized， and their effects on the performance of co-pyrolysis were also investigated. The in-situ mode resulted in a higher bio-oil yield compared to the ex-situ mode. However， the Diels-Alder and aromatization reactions were promoted in the ex-situ pyrolysis， leading to a higher aromatic selectivity of 82.8 %. The introduction of transition metal Fe improved the anti-coking ability； therefore， Fe/HZSM-5 had the least coke amounts of 3.77 wt% among the three catalysts. Compared to HZSM-5， Fe/HZSM-5 had a lower Br?nsted acid density， thus leading to a slight decrease in the selectivity of hydrocarbons but a dramatic increase in the selectivity of aromatics by 16.7 %. Owing to the coke deposition， the BET surface area， pore volume， and there was a decrease in the acidity of the three post-catalytic catalysts， lowering their catalytic ability.

Key words: biomass, plastic, co-pyrolysis, catalytic mode, deactivation

罗冠群王卫民汤元君李璇陶轩. 催化剂与催化方式对生物质/塑料共热解的影响[J]. , 2023, 37(4): 86-94.

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