微波耦合铁基催化剂辅助废塑料裂解脱氢研究  

Research on microwave-assisted dehydrogenation of waste plastics over iron-based catalysts

作　　者：李文涛 钱柯贞 尹丽洁 陈德珍[1,2] LI Wentao;QIAN Kezhen;YIN Lijie;CHEN Dezhen(School of Mechanical and Energy Engineering,Tongji University,Shanghai 200092,China;Shanghai Engineering Research Center of Multi-source Solid Wastes Co-processing and Energy Utilization,Shanghai 200092,China)

机构地区：[1]同济大学机械与能源工程学院,上海200092 [2]上海多源固废协同处理和能源化工程技术研究中心,上海200092

出　　处：《上海理工大学学报》2023年第5期433-439,共7页Journal of University of Shanghai For Science and Technology

基　　金：国家重点研发计划(2020YFC1910100);国家自然科学基金资助项目(52106266);国家高等教育机构通用研究与发展项目(22120210538);上海市自然科学基金资助项目(22ZR1465900)。

摘　　要：塑料裂解脱氢可以实现废塑料的高值化利用。与传统塑料热解相比,微波催化可以在较短时间内实现更高的H_(2)产率和转化率。对比研究了不同结构的Fe基催化剂在微波场下对塑料脱氢产率的影响,探讨了催化剂组成与塑料脱氢活性之间的作用机制。结果表明,Al2O3负载型Fe催化剂和Fe-Al复合氧化物均可以获得较高的H_(2)产率,并促进碳纳米管的生成,后者的H_(2)产率可达46 mmol/g。通过X射线衍射和穆斯堡尔谱的表征分析,发现催化剂的微波吸收性能、催化剂中铁的形态和分散度是决定塑料在微波场下裂解脱氢性能的重要因素。此外,采用SiC管反应器屏蔽微波电磁场,研究了微波对塑料裂解脱氢反应的影响。在相同的温度条件下,SiC管反应器中的塑料裂解脱氢性能显著下降,证明微波电磁场对塑料裂解脱氢反应具有促进作用。Plastic dehydrogenation facilitates the revalorization of discarded plastic.Compared with conventional plastic pyrolysis,microwave catalysis can achieve higher H_(2)yield and conversion in a shorter time.The effects of different structures of iron-based catalysts on the H_(2)yield in microwave field were studied,and the interaction mechanism between catalyst composition and dehydrogenation activity of plastic was discussed.Results showed that Al2O3-loaded iron catalysts and Fe-Al composite oxides can obtain high H_(2)yield and promote the generation of carbon nanotubes,with the latter achieving H_(2)yield up to 46 mmol/g.The microwave absorption properties,iron morphology,and dispersion of the catalysts play important roles in the dehydrogenation of plastic under microwave fields,as shown by X-ray diffractometry and Mössbauer spectroscopy.Furthermore,the effect of a microwave field shielded by a SiC tube reactor on the dehydrogenation of plastic was investigated.The results show that the amount of dehydrogenation of plastic in the SiC tube reactor decreases significantly under the same temperature conditions,which proves that the microwave field has a favorable effect on the dehydrogenation of plastic.

关 键 词：微波催化 Fe基催化剂 塑料裂解 H2产率 

分 类 号：TQ116.2[化学工程—无机化工]