Catalytic epoxidation of alkenes with 30% H2O2 over Mn2+-exchanged zeolites
摘要:
The Mn2+-exchanged zeolites Mn-Y, Mn-beta, Mn-A and Mn-ZSM-5 were prepared and used as heterogeneous catalysts for the liquid phase epoxidation of alkenes with aqueous hydrogen peroxide (30% H2O2) at 273-298 K in the NaHCO3 buffer system. The structures of catalysts were characterized by powder Xray diffraction (XRD), UV-vis, ICP, BET and IR techniques. Mn-beta and Mn-Y exhibited the best recyclable activity for the epoxidation of styrene to achieve styrene conversions higher than 96.0 and 98.5 mol%, respectively. Mn-beta showed higher activity for cyclohexene and norbornene but lower activity for alpha-methylstyrene, cinnamyl chloride, indene, cyclooctene and alpha-pinene than Mn-Y, which could be correlated with the difference of their pore sizes. However, these catalysts did not show any activity for the epoxidation of 1-octene with H2O2, possibly due to low electron density of double bonds of linear terminal alkenes. (C) 2010 Elsevier B.V. All rights reserved.
Process for the ruthenium-catalysed epoxidation of olefins by means of hydrogen peroxide
申请人:Magerlein Wolfgang
公开号:US20060161011A1
公开(公告)日:2006-07-20
The present invention relates to a process for the epoxidation of olefins using catalysts based on ruthenium complexes in the presence of hydrogen peroxide.
本发明涉及一种利用基于钌配合物的催化剂在过氧化氢存在下对烯烃进行环氧化的方法。
An efficient biomimetic Fe-catalyzed epoxidation of olefins using hydrogen peroxide
作者:Gopinathan Anilkumar、Bianca Bitterlich、Feyissa Gadissa Gelalcha、Man Kin Tse、Matthias Beller
DOI:10.1039/b612048b
日期:——
environmentally benign and practical epoxidation method was developed using inexpensive and efficient Fe catalysts. FeCl3.6H2O in combination with commercially available pyridine-2,6-dicarboxylic acid and amines showed excellent reactivity and selectivity towards aromatic olefins and moderate reactivity towards 1,3-cyclooctadiene utilizing H2O2 as the terminal oxidant.