丙烯
分子筛
六甲苯
化学
甲醇
催化作用
选择性
烯烃纤维
沸石
结晶度
碳氢化合物
有机化学
苯
结晶学
作者
Li Zhang,Bo Geng,Sen Wang,Pengfei Wang,Xiuli He,Jianfeng Jia
标识
DOI:10.1016/j.micromeso.2023.112744
摘要
In this study, F− was added to the synthesis gel to regulate the acid property of SAPO-18 molecular sieve and enhance its catalytic performance for the methanol-to-olefin (MTO) reactions. The results indicate that adding an appropriate amount of F− during synthesis can increase the crystallinity of SAPO-18 molecular sieve and reduce the overall strong acid density and external surface acid content. The H-SAPO-18-I-20-0.0025 molecular sieve exhibits a much higher catalytic lifetime (1000 min) and light olefins selectivity (45.2% to propene and 96.1% to C2-5=) in MTO at 400 °C than those of the traditional H-SAPO-18-1-0. The results of the isotope labeling experiments, GC-MS, and 13C MAS NMR results provided direct evidence that the aromatic-based cycle contributes more to the conversion of methanol into light olefins, and hexamethylbenzene serves as the most abundant hydrocarbon species that produces propene via the paring route.
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