Low-nuclearity Pt sites directionally deposited on CeZrOx interface for breaking “trade-off” limitation in low-temperature RWGS reaction

Abstract

The reverse water-gas shift (RWGS) reaction is considered as one of the promising routes for converting greenhouse gases into CO intermediates and subsequently generating high-value products. However, CO₂ is difficult to activate at low temperatures and tends to form by-product CH₄, resulting in poor conversion and selectivity. In this work, a targeted strategy was developed to oriented deposite Pt components on in-situ constructed CeZrO_x interfaces. Due to the dispersion and anchoring effect derived from the oxygen vacancies of the CeZrO_x interface, the supported Pt sites were dominantly existed as low-nuclearity configuration. Moreover, the defect-enriched interface showed exceptional electron donation to Pt sites (Pt^δ- species) via an electronic metal-support interaction (EMSI), which was endowed with stronger H dissociation properties. Combined with the superior ability for the activation of CO₂ over oxygen vacancies at CeZrO_x interface, the catalytic performance of low-temperature RWGS reaction was synergistically improved.