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- Title
Formation of a Porous Crystalline Mg<sub>1‐x</sub>Al<sub>2</sub>O<sub>y</sub> Overlayer on Metal Catalysts via Controlled Solid‐State Reactions for High‐temperature Stable Catalysis.
- Authors
Cai, Lihua; Han, Shanlei; Xu, Wenlong; Chen, Si; Shi, Xianxian; Lu, Junling
- Abstract
Catalyst deactivation by sintering and coking is a long‐standing issue in metal‐catalyzed harsh high‐temperature hydrocarbon reactions. Ultrathin oxide coatings of metal nanocatalysts have recently appeared attractive to address this issue, while the porosity of the overlayer is difficult to control to preserve the accessibility of embedded metal nanoparticles, thus often leading to a large decrease in activity. Here, we report that a nanometer‐thick alumina coating of MgAl2O4‐supported metal catalysts followed by high‐temperature reduction can transform a nonporous amorphous alumina overlayer into a porous Mg1‐xAl2Oy crystalline spinel structure with a pore size of 2–3 nm and weakened acidity. The high porosity stems from the restrained Mg migration from the MgAl2O4 support to the alumina overlayer through solid‐state reactions at high temperatures. The resulting Ni/MgAl2O4 and Pt/MgAl2O4 catalysts with a porous crystalline Mg1‐xAl2Oy overlayer achieved remarkably high stability while preserving much higher activity than the corresponding alumina‐coated Ni and Pt catalysts on MgO and Al2O3 supports in the reactions of dry reforming of methane and propane dehydrogenation, respectively.
- Subjects
METAL catalysts; CATALYSIS; METAL coating; METAL nanoparticles; OXIDE coating; CATALYST supports; CATALYST poisoning; POROUS metals
- Publication
Angewandte Chemie, 2024, Vol 136, Issue 28, p1
- ISSN
0044-8249
- Publication type
Academic Journal
- DOI
10.1002/ange.202404398