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Surface Engineering Protocol To Obtain an Atomically Dispersed Pt/CeO₂ Catalyst with High Activity and Stability for CO Oxidation
- Chen, Jiayu, Wanyan, Yongjin, Zeng, Jianxin, Fang, Huihuang, Li, Zejun, Dong, Yongdi, Qin, Ruixuan, Wu, Changzheng, Liu, Deyu, Wang, Mingzhi, Kuang, Qin, Xie, Zhaoxiong, Zheng, Lansun
- ACS sustainable chemistry & engineering 2018 v.6 no.11 pp. 14054-14062
- adsorption, ambient temperature, ascorbic acid, carbon monoxide, catalysts, catalytic activity, ceric oxide, cerium, engineering, nanoparticles, nanorods, oxidation, protocols
- Atomically dispersed metal catalysts often exhibit superior performance compared to that of nanoparticle catalysts in many catalysis processes. However, these so-called “single-atom” catalysts have a consistently low loading density on the support surface and easily aggregate at high temperatures, hindering their practical application. Herein, we demonstrate a facile surface engineering protocol using molecule–surface charge transfer adducts to fabricate highly stable noble metal catalysts with atomic dispersion, using a Pt/CeO₂ catalyst as an example. The key of this approach is the generation of an adequate amount of Ce³⁺ defective sites on the porous CeO₂ surface through the adsorption of reductive ascorbic acid molecules and a subsequent surface charge transfer process. Subsequently, noble metal Pt atoms can be well-dispersedly anchored onto the generated Ce³⁺ sites of porous CeO₂ nanorods with a loading density of up to 1.0 wt %. The as-prepared highly dispersed Pt/CeO₂ catalyst showed outstanding catalytic activity at near room temperature toward CO oxidation, with excellent stability over several days, which is far superior to the traditional impregnation-prepared catalysts, the activity (complete conversion at 90 °C) of which is severely decayed within a couple of hours. The proposed synthetic route is simple yet versatile and can therefore be potentially applied to fabricate other supported noble metal catalysts with atomic dispersion.