三维Al_(2)O_(3)@HZSM-5双功能催化剂的制备及其微波辅助热解塑料废弃物中轻质芳烃的选择性

Preparation of 3D Al_(2)O_(3)@HZSM-5 dual-function catalyst and itsselectivity of light aromatics from waste plastics by microwave-assisted pyrolysis

制备了集微波吸收、催化转化于一体的三维Al_(2)O_(3)@HZSM-5双功能催化剂,并将其用于塑料废弃物微波辅助热解制备轻质芳烃.采用XRD、SEM、N 2等温吸附和矢量网络分析等手段对催化剂的结构、形貌和微波吸收等性质进行了表征,研究了催化剂用于微波辅助热解塑料废弃物制备轻质芳烃的催化能力.实验结果表明,Al_(2)O_(3)泡沫能通过抑制焦炭和气体的形成显著提高热解油的产率,HZSM-5分子筛有利于促进产物向更为经济的高质量轻质芳烃(甲苯、乙苯、苯)转化.研究表明三维Al_(2)O_(3)@HZSM-5双功能催化剂能够显著提高热解油产率并增强轻质芳烃的选择性,热解油产率达到83.86 wt%,轻质芳烃(甲苯、乙苯、苯)选择性高达64.7%.

In this study,the 3D Al_(2)O_(3)@HZSM-5 dual-function catalysts with microwave absorption and catalytic conversion were prepared.The dual-functional catalyst was used to prepare light aromatics from waste plastics by microwave-assisted pyrolysis.The structure,morphology,and microwave absorption of the catalyst were characterized through XRD,SEM,N 2 isothermal adsorption,and vector network analysis.The catalytic ability of the catalyst for the preparation of light aromatics by microwave-assisted pyrolysis of waste plastics was studied.The experimental results show that Al_(2)O_(3)foam can significantly increase the yield of pyrolysis oil by inhibiting the formation of coke and gas,and the HZSM-5 molecular sieve is conducive to the promotion of the conversion of products to more economical high-quality light aromatics(toluene ethylbenzene,benzene).Research shows the 3D Al_(2)O_(3)@HZSM-5 dual-function catalyst can significantly increase the yield of pyrolysis oil and enhance the selectivity of light aromatics,with the yield of pyrolysis oil reaching 83.86wt%,and the selectivity of light aromatics(toluene,ethylbenzene,benzene)reaching 64.7%.