纳米颗粒
甲醇
材料科学
化学工程
纳米技术
化学
有机化学
工程类
作者
So Yun Jeong,Ji Hyun Kim,Min Jung Park,Xu Wang,Jong Wook Bae
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2024-02-19
卷期号:12 (10): 4245-4254
标识
DOI:10.1021/acssuschemeng.3c08330
摘要
Homogeneously distributed Cu-ZnO(-Al2O3) nanoparticles encapsulated with SiO2 shells (denoted as Cu@Si, CZ@Si, and CZA@Si) are investigated to increase their thermal resistance for stable CO2 hydrogenation activity caused by the newly formed strong metal–support interaction (SMSI) of spatially confined CZA nanoparticles. The core–shell-structured CZA nanoparticles coated with protective silica shell layers revealed a higher CO2 hydrogenation activity to methanol with an excellent catalytic stability. The uniformly distributed core–shell-structured CZA nanoparticles ∼3 nm in size were found to be thermally stable even after CO2 hydrogenation reaction without any structural collapses and insignificant aggregations of the CZA nanoparticles. The spatially confined Cu-based nanoparticles with the help of the SiO2 protective shell layers having larger strong basic sites (oxygen vacant sites) showed a higher CO2 conversion of 11.0–15.8% and selectivity to methanol of 46.3–65.4% for a 200 h reaction, which were mainly attributed to their excellent antiaggregation characteristics through SMSI contributions between CZA core nanoparticles and thermally stable protective SiO2 shell layers.
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