文献类型：期刊文献

英文题名：Multi-technique characterization of recycled acetylene carbonylation catalyst CuY: deactivation and coke analysis

作者：Liu, Naiwang[1];Xie, Hao[1];Cao, Huaixuan[1];Shi, Li[1];Meng, Xuan[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：242

起止页码：617

外文期刊名：FUEL

收录：;EI(收录号：20190406401990);WOS:【SCI-EXPANDED(收录号:WOS:000459430100065)】；

基金：We are so grateful and want to extend our sincere appreciations for the financial support from Science and Technology Commission of Shanghai Municipality (No. 18YF1406300), National Natural Science Foundation of China (No. 21808054), China Postdoctoral Science Foundation (No. 2017M621389), and Ministry of Education of China (No. 222201814011).

语种：英文

外文关键词：CuY; Carbonylation; Deactivation; Regeneration; Coke

摘要：A heterogeneous Cu modified Y zeolite is prepared for acetylene carbonylation, and acrylic acid yield is up to 86%; this catalyst could maintain similar to 50% of initial activity even after three catalytic cycles. Regenerating the spent catalyst in air followed by N-2 could restore the activity to 80%. Multiple measurement techniques, including XRD, ICP, XPS, NH3-TPD, TGA, Raman and SEM are carried out to obtain a deep understanding of the catalyst deactivation. During the reaction process, unreacted acetylene is pyrolyzed, solubilized, diffused, accumulated and solidified as disordered carbonaceous particles on the catalyst, then transferred to ordered filaments. At the same time, CuO is dissolved into the reaction liquid and only Cu+ is left, which reduce the acidity of catalyst in both amount and strength. Results show that factors causing the catalyst deactivation obey the following order: coke deposition > copper loss > acidity weakening > crystallinity collapse.