143476-91-9Relevant articles and documents
NICKEL(0)-INDUZIERTE C-C-VERKNUEPFUNG ZWISCHEN 1,2-DIENEN UND KOHLENDIOXID
Hoberg, H.,Oster, B. W.
, p. 321 - 326 (1984)
1,2-Dienes react with CO2 at nickel(0) under the influence of basic chelate ligands to form nickela carboxylates.The structures of these five-membered complexes have been determined by spectroscopic and chemical methods.The regioselectivity of the C-C bond formation is discussed.
A CATALYST AND A PROCESS FOR THE PRODUCTION OF ETHYLENICALLY UNSATURATED CARBOXYLIC ACIDS OR ESTERS
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Page/Page column 40, (2021/02/05)
The invention discloses a catalyst comprising a silica support, a modifier metal and a catalytic alkali metal. The silica support has a multimodal pore size distribution comprising a mesoporous pore size distribution having an average pore size in the range 2 to 50 nm and a pore volume of said mesopores of at least 0.1 cm3/g, and a macroporous pore size distribution having an average pore size of more than 50 nm and a pore volume of said macropores of at least 0.1 cm3/g. The level of catalytic alkali metal on the silica support is at least 2 mol%. The modifier metal is selected from Mg, B, Al, Ti, Zr and Hf. The invention also discloses a method of producing the catalyst, a method of producing an ethylenically unsaturated carboxylic acid or ester in the presence of the catalyst, and a process for preparing an ethylenically unsaturated acid or ester in the presence of the catalyst.
The effect of the bimetallic Pd-Pb structures on direct oxidative esterification of methacrolein with methanol
Diao, Yanyan,Qi, Miao,Song, Yuting,Wang, Ling,Wu, Xiangying
, (2021/06/28)
Supported palladium and palladium alloy were proved to be active catalysts for the oxidative esterification reaction of methacrolein with methonal to methyl methacrylate. Here we synthesized two types of structurally supported palladium alloy catalysts with ordered or disordered Pd3Pb intermetallic crystals by impregnation-reduction method as well as high temperature heat treatment. Importantly, the catalyst with disordered Pd3Pb crystals had 89% conversion for methylacrolein and 79% selectivity for methyl methacrylate, showing obvious higher activity than the catalyst with ordered Pd3Pb crystals. The morphology, metal arrangement and electron effect of the catalyst were analyzed by XRD, TEM and XPS. It was confirmed that more active sites and strong electron transfer between metals were the reasons for the excellent performance of the disordered catalyst. This study provides theoretical guidance for the further study of Pd-based catalysts for the oxidative esterification of methacrolein to methyl methacrylate.
