High-efficiency Ce-modified ZSM-5 nanosheets for waste plastic upgrading  

作　　者：Xiaomei Wang Xueting Wu Meng Zhao Rui Zhang Zijian Wang Yuou Li Liangliang Zhang Xiao Wang Shuyan Song Hongjie Zhang 

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [2]School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,China [3]Department of Chemistry,Tsinghua University,Beijing 100084,China

出　　处：《Nano Research》2024年第6期5645-5650,共6页纳米研究（英文版）

基　　金：the financial aid from the National Science and Technology Major Project of China(No.2020YFE0204500);the National Natural Science Foundation of China(Nos.22020102003,22025506,and 22271274);Program of Science and Technology Development Plan of Jilin Province of China(Nos.20230101035JC and 20230101022JC).

摘　　要：Zeolite-based catalyst hydrocracking of plastics is a potential strategy for mitigating the environmental impacts of plastic wastes and recycling valuable resources,but difficult mass transfer,low concentration of acid sites,and high cost are still barriers to their practical applications.In this paper,we report an excellent hydrocracking catalyst of ZSM-5 nanosheets(Ce/b-ZSM-5)modified by Ce species with high conversion up to 96.3%,C_(3)−C_(5)selectivity up to 80.9%,and good stability during the hydrogenation of low-density polyethylene.Through comprehensive studies,b-ZSM-5 shows higher molecular diffusion efficiency and acid site concentrations compared with normal ZSM-5(n-ZSM-5)and hollow ZSM-5(h-ZSM-5).The introduction of Ce species into b-ZSM-5 further increases the density of Brønsted(B)and Lewis(L)acid sites as active sites,which enhances the adsorption of substrates and facilitates the formation of intermediates and desorption of products.As a result,the hydrocracking activity of Ce/b-ZSM-5 is significantly improved.

关 键 词：rare earth zeolite plastic degradation catalytic hydrocracking morphology acidic site 

分 类 号：O64[理学—物理化学]