Construction of cerium-based oxide catalysts with abundant defects/vacancies and their application to catalytic elimination of air pollutants

Abstract

As environmental regulations become more stringent and public awareness of the need for environmental protection increases, air pollution has become an issue of widespread concern. Catalytic purification technology is considered...

Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

“…234 At present, the previous literature has reported the application of Ce-based oxide catalysts for the soot combustion. 235,236 Because of the agglomeration of pure CeO 2 catalysts during the soot catalytic oxidation, the redox ability of pure CeO 2 catalysts will decline because of the reduction of surface active sites. Therefore, to solve the above problems, many different methods, such as improving the preparation method of CeO 2 catalysts, doping the catalysts with different elements, and loading the catalysts with active components, have been proposed.…”

Review of Shape-Controlled CeO2 Nanocatalysts for Purification of Auto-Exhaust Pollutants

“…CeO 2 exhibits a fluorite structure with each cerium cation coordinated by eight oxygen anions in a face-centered cubic (FCC) lattice (Figure a). The electronic configuration of cerium enables efficient reversible charge transfer between Ce 4+ and Ce 3+ states in the FCC lattice. , This inherent interchangeable Ce 3+ /Ce 4+ redox property allows ceria to exhibit a stable nonstoichiometric CeO 2– x (0 < x ≤ 0.5) with a high concentration of oxygen vacancies and high ionic mobility . The oxygen vacancies play a favorable role in enhancing the adsorption/activation of gaseous oxygen, which is crucial for the efficient purification of CO, soot, NO x , and VOCs.…”

Insights into the Reactivation Process of Thermal Aged Bimetallic Pt-Pd/CeO2-ZrO2-La2O3 Catalysts at Different Treating Temperatures and Their Structure–Activity Evolutions for Three-Way Catalytic Performance

“…Three-way catalysts can simultaneously eliminate three major pollutants from automobile exhaust including carbon monoxide (CO), hydrocarbons (HCs), and nitrogen oxides (NO x ) and have been widely employed as the most effective after-treatment technique for automobile pollution control [3,4]. Typical TWC catalysts generally consist of precious metals (PM, such as Pt, Pd, and Rh), γ-Al 2 O 3 , and CeO 2 -ZrO 2 supporting materials [5], among which Pt and Pd are the most essential active components.…”