Thermally stable and highly active Pt/CeO₂@SiO₂ catalysts with a porous/hollow structure

Abstract

One robust selective-etching approach is used to encapsulate Pt/CeO2 composites into SiO2 with a porous/hollow structure for enhanced thermal stability and catalytic activity.

Constructing a Pt/YMn2O5 Interface to Form Multiple Active Centers to Improve the Hydrothermal Stability of NO Oxidation

“…Taking Chen's work as an example, they coencapsulated Pt nanoparticles and Ce−Cu bimetal oxide into SiO 2 and then acquired Pt/CeO 2 @SiO 2 catalysts with excellent thermal stability and CO oxidation performance, in which Pt particles were not sintered obviously even after the 600 °C high-temperature treatment. 13 The third approach is to enhance the metal−support interactions. On the one hand, handling the characteristics of the support mainly includes adjusting the morphologies or changing the chemical composition of supports.…”

“…The second method is physical confinement, where metal nanoparticles are encapsulated in a porous matrix or conformally deposited as a protective layer on top of the particles. Taking Chen’s work as an example, they coencapsulated Pt nanoparticles and Ce–Cu bimetal oxide into SiO 2 and then acquired Pt/CeO 2 @SiO 2 catalysts with excellent thermal stability and CO oxidation performance, in which Pt particles were not sintered obviously even after the 600 °C high-temperature treatment . The third approach is to enhance the metal–support interactions.…”

Improving time-resolution and sensitivity of in situ X-ray photoelectron spectroscopy of a powder catalyst by modulated excitation

“…The assignment of the last component characterized by the highest binding energy (338.6 eV) is more complex and debated. [41][42][43][44] It can be related to cationic Pd species that are surface species (1) in an oxidation state higher than 2+ [45][46][47] and/ or (2) possessing strong interaction with the alumina support [48][49][50][51][52] as well as (3) replacing a cation in the metal oxide lattice (depending on the support). 41,44,53 Recently, we assigned the component characterized by the peak at 338.6 eV to palladium adatoms on the surface of the alumina support.…”