首页 > 新闻公告 > CEM研究国际动态 CEM研究国际动态
Adsorbate-mediated strong metal–support interactions in oxide-supported Rh catalysts

The optimization of supported metal catalysts predominantly focuses on engineering the metal site, for which physical insights based on extensive theoretical and experimental contributions have enabled the rational design of active sites. Although it is well known that supports can influence the catalytic properties of metals, insights into how metal–support interactions can be exploited to optimize metal active-site properties are lacking. Here we utilize in situ spectroscopy and microscopy to identify and characterize a support effect in oxide-supported heterogeneous Rh catalysts. This effect is characterized by strongly bound adsorbates (HCOx) on reducible oxide supports (TiO2 and Nb2O5) that induce oxygen-vacancy formation in the support and cause HCOx-functionalized encapsulation of Rh nanoparticles by the support. The encapsulation layer is permeable to reactants, stable under the reaction conditions and strongly influences the catalytic properties of Rh, which enables rational and dynamic tuning of CO2-reduction selectivity.

Nature Chemistry (2016) doi:10.1038/nchem.2607
Received 24 December 2015 Accepted 05 August 2016 Published online 19 September 2016

http://www.nature.com/nchem/journal/vaop/ncurrent/full/nchem.2607.html#userconsent#

发布日期:2016/09/21 发布者: 点击数: