丙烯
芳构化
沸石
ZSM-5型
铜
丙烯醛
烯丙基重排
化学
催化作用
苯
甲苯
光化学
无机化学
有机化学
作者
Zoya N. Lashchinskaya,Anton A. Gabrienko,Alexander G. Stepanov
标识
DOI:10.1016/j.micromeso.2023.112448
摘要
Propene transformation on copper-modified ZSM-5 zeolite has been studied by 13C MAS NMR and FTIR spectroscopy. Two major reaction pathways are identified, aromatization to the simple aromatic hydrocarbons (benzene, toluene) and oxidation to acrolein. Copper-allyl species is inferred to be the key intermediate in both processes. π-Complex of propene with copper sites is the primary intermediate, preceding the formation of copper-allyl species. The role of different active sites is established. Cu2+–O2– Lewis acid-base pairs are responsible for the allylic species formation, whereas [Cu3(μ-O)3]2+ oxo-clusters provide the oxidation of copper-allyls. The results obtained are of importance for developing zeolite-based catalysts for propene aromatization to the simple aromatic compounds and partial oxidation to acrolein.
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