Amorphous Silica Induced Loose CeO2 Clusters with Isolated Pt Atoms for Efficient Reverse-Water Gas Shift Reaction

Abstract

Pt-based catalysts exhibit extraordinary potential in reverse-water gas shift (RWGS) reactions, but often fail to possess a high reaction rate and high durability at the same time under high temperature. Herein, we designed a SiO2-induced loose CeO2 as an effective capture for Pt atoms. The abundant surface O vacancies in the loose CeO2 can trigger significant electron transfer from Pt to CeO2 and play a crucial role in stabilizing Pt atoms, therefore, largely improving its thermal stability. The as-synthesized Pt-aCeO2@SiO2 catalyst possesses a record CO production rate of 7672.7 molCO molPt−1 h−1 with CO selectivity > 97% at 400 °C surpass most of the reported Pt-based catalysts. More importantly, over 90% of the initial activity of the catalyst remains after 200 h constant operation at 400 °C, verifying the improved durability of Pt atoms under high temperature. Our investigation proposes a method of inducing the formation of defect-rich active supports through amorphous substrates, providing new thinking for designing atomic catalysts with good stability under high temperatures.