期刊
ACS CATALYSIS
卷 5, 期 10, 页码 5696-5701出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b01348
关键词
methane oxidation; palladium; thermal stability; improved rates; atomic layer deposition; zirconia
资金
- Department of Energy, Office of Basic Energy Sciences, Chemical Sciences, Geo-sciences and Biosciences Division [DE-FG02-13ER16380]
- National Science Foundation [CBET-1159240, DMR-0723032]
- Directorate For Engineering [1159240] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [1159240] Funding Source: National Science Foundation
The effect of modifying Pd/Al2O3 catalysts by atomic layer deposition of 1 nm ZrO2 films was studied. For deposition on oxidized, PdO/Al2O3 catalysts, TEM imaging, EDS mapping, and metal-dispersion measurements confirmed the presence of the thin ZrO2 over both the Al2O3 support and the metal particles. The ZrO2 films were surprisingly stable, forming a well-crystallized phase only above 1173 K. The ZrO2 coating over the PdO particles created a semicore-shell-like structure that stabilized the metal against sintering in air at 1073 K. Steady-state, methane oxidation rates on unmodified PdO/Al2O3 decreased with increasing catalyst calcination temperature, but rates on the ZrO2-covered surfaces increased with increasing calcination temperature.
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