Low‐Temperature Preferential Oxidation of Carbon Monoxide on Pt3Ni Alloy Nanoparticle Catalyst with Engineered Surface

Abstract Octahedral Pt 3 Ni alloy nanoparticles on carbon and alumina supports are prepared using a simple solid‐state chemistry method and tested for CO preferential oxidation (PROX) in H 2 . Both catalysts exhibit much superior PROX property comparing to spherical Pt 3 Ni alloy and pure Pt, with high activity and 100 % selectivity between around RT and 100 °C. The improved activity of the octahedral Pt 3 Ni has been attributed to bifunctional sites mechanism. The excellent selectivity is correlated with the unique surface geometry and electronic structure of the octahedral Pt 3 Ni.