Surface Lattice-Embedded Pt Single-Atom Catalyst on Ceria-Zirconia with Superior Catalytic Performance for Propane Oxidation

Abstract

Tuning the metal–support interaction and coordination environment of single-atom catalysts can help achieve satisfactory catalytic performance for targeted reactions. Herein, via the facile control of calcination temperatures for Pt catalysts on pre-stabilized Ce0.9Zr0.1O2 (CZO) support, Pt single atoms (Pt1) with different strengths of Pt–CeO2 interaction and coordination environment were successfully constructed. With the increase in calcination temperature from 350 to 750 °C, a stronger Pt–CeO2 interaction and higher Pt-O-Ce coordination number were achieved due to the reaction between PtO x and surface Ce3+ species as well as the migration of Pt1 into the surface lattice of CZO. The Pt/CZO catalyst calcined at 750 °C (Pt/CZO-750) exhibited a surprisingly higher C3H8 oxidation activity than that calcined at 550 °C (Pt/CZO-550). Through systematic characterizations and reaction mechanism study, it was revealed that the higher concentration of surface Ce3+ species/oxygen vacancies and the stronger Pt–CeO2 interaction on Pt/CZO-750 could better facilitate the activation of oxygen to oxidize C3H8 into reactive carbonate/carboxyl species and further promote the transformation of these intermediates into gaseous CO2. The Pt/CZO-750 catalyst can be a potential candidate for the catalytic removal of hydrocarbons from vehicle exhaust.

Weakening Mn–O Bond Strength in Mn-Based Perovskite Catalysts to Enhance Propane Catalytic Combustion

“…Catalytic combustion (oxidation) has been widely regarded as one of the most promising ways to eliminate VOC emissions due to its low cost and high efficiency. , The core of this technology lies in the development of catalysts that convert harmful VOCs into harmless CO 2 and H 2 O, which can exhibit remarkable activity at low temperatures and exceptional thermal stability at high temperatures. , Although noble metal-based ( e.g. , Pt and Pd) catalysts have high catalytic activity for VOC oxidation, − the high cost poses a significant barrier to widespread implementation, which has prompted researchers to focus on developing low-cost transition metal oxide catalysts. − …”

Robust Ru/Ce@Co Catalyst with an Optimized Support Structure for Propane Oxidation

“…Like other VOCs, Pt- and Pd-based catalysts have been applied to the catalytic combustion of low-carbon alkanes. − Although these catalysts were optimized in the hope of increasing the oxidation activity of low-carbon alkanes, they were still unable to meet the requirements of the actual working conditions to achieve efficient purification at approximately 250 °C. In addition, the high catalyst cost further limits the applications of Pt- and Pd-based catalysts.…”

Constructing tri-coordinated Al (AlIII) sites to boost complete propane oxidation of the Pt/Al2O3 catalyst

“…Complete propane oxidation has vital importance in practical applications, including automobile exhaust control, energy generation, and volatile organic compound (VOC) elimination. 1–4 However, it is always a huge challenge to achieve the complete elimination of low-concentration propane at low temperatures, since the propane molecule consists of saturated C–H bonds and is difficult to be adsorbed and activated. Hence, it is imperative to design and develop highly active catalysts proficient in complete propane oxidation.…”