Stable and Surface‐active Co Nanoparticles Formed from Cation (
<i>x</i>
) Promoted Au/
<i>x</i>
‐Co
<sub>3</sub>
O
<sub>4</sub>
(
<i>x</i>
=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions
作者:Charles O. Oseghale、Batsile M. Mogudi、Oluwatayo Racheal Onisuru、Christianah Aarinola Akinnawo、Dele Peter Fapojuwo、Reinout Meijboom
DOI:10.1002/cctc.202001841
日期:2021.3.5
stable cobalt nanoparticles generated from alkali ion‐promoted gold catalyst for catalyzed carbonylative [2+2+1] cyclization reaction, is described. The gold nanoparticle‘s (AuNPs) role was assumed to dissociate the CO and H2 into atomic species on the catalyst surface by spillover, which in‐situ reduces the robust mesoporous cobalt oxide to metallic cobalt (Co3+→Co2+→Co), as the active catalytic species
描述了由碱离子促进的金催化剂产生的表面活性和高度稳定的钴纳米颗粒,用于催化羰基化[2 + 2 + 1]环化反应。假定金纳米颗粒的(金纳米粒子)的作用CO和H解离2到催化剂表面上的原子种类由溢出,这在原位降低了鲁棒孔氧化钴,以金属钴(Co 3+ →CO 2 + →CO) ,作为催化反应的活性催化物质;从而提供高达93%的环戊烯酮加合物收率。在此之前,用H 2进行催化剂预处理气体(130℃,3小时,20atm)被执行以还原催化剂。似乎是由于在较温和的反应条件下进行的分子内和分子间反应,催化剂中存在碱离子促进剂导致还原温度低和表面碱度升高,与催化剂活性密切相关。因此,开发了用于羰基化反应的可持续,高度可重复使用且对环境友好的绿色催化剂,例如Pauson-Khand。