低碳化学与化工2024，Vol.49Issue(6)：1-8,8.DOI:10.12434/j.issn.2097-2547.20240014
工业失效的甲醇制烯烃催化剂微球原位晶化研究
Research on in-situ crystallization of industrial failed catalyst microspheres for methanol to olefins
摘要
Abstract
In order to solve the problem of resource utilization of industrially failed catalyst for methanol to olefins(MTO)and achieve the recycle of MTO catalysts,MTO catalysts with SAPO-34 molecular sieves as the active component were successfully prepared in a hydrothermal synthesis system using industrial failed MTO catalyst microspheres as raw materials through in-situ crystallization.XRD,SEM,N2 adsorption/desorption,XRF,NH3-TPD and infrared spectra of deuterated acetonitrile(CD3CN)were used to analyze the crystal structures,morphology characterizations,pore structures,elemental compositions and acidities of catalysts before and after in-situ crystallization.The catalytic performances of catalysts before and after in-situ crystallization in MTO reaction were evaluated in a fixed fluidized bed reactor.The research conditions were reaction temperature of 480℃,atmospheric pressure and methanol mass space velocity of 4 h-1,and raw material was pure methanol.The results show that compared with the catalyst before in-situ crystallization,the relative crystallinity of the catalyst after in-situ crystallization increases by 76%.And the specific surface area and content of B acid increase separately by 1.4 times and 1.1 times.In MTO reaction,the selectivity of dienes(ethylene and propylene)reaches the highest of 89.64%.Compared with the catalyst before in-situ crystallization,the selectivity of dienes increases by 3.3%.The contents(mass fraction)of dimethyl ether and heavy hydrocarbons such as C4 and C5+are significantly reduced,and the catalyst after in-situ crystallization has excellent stability.关键词
失效催化剂/甲醇制烯烃/微球/原位晶化Key words
failed catalyst/methanol to olefins/microspheres/in-situ crystallization分类
化学化工引用本文复制引用
丁佳佳,申学峰,叶迎春,刘红星..工业失效的甲醇制烯烃催化剂微球原位晶化研究[J].低碳化学与化工,2024,49(6):1-8,8.基金项目
国家重点研发计划(2023YFA1507704) （2023YFA1507704）
上海市青年科技英才扬帆计划(21YF1459600). （21YF1459600）
