Details

Autor(en) / Beteiligte

• Mao, Xinyu
• Foucher, Alexandre
• Stach, Eric A.
• Gorte, Raymond J.

Titel

A Study of Support Effects for CH4 and CO Oxidation over Pd Catalysts on ALD-Modified Al2O3

Ist Teil von

• Catalysis letters, 2019-04, Vol.149 (4), p.905-915

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Interactions between a metal and its oxide support can influence CO and CH 4 oxidation, but promotion by the support can be difficult to study because oxides can have different surface structures and surface areas. To focus on the chemical aspects of support promotion for CO and CH 4 oxidation, this study investigated the effect of support composition on Pd catalysts by preparing uniform films of NiO, Co 3 O 4 , Fe 2 O 3 , MnO 2 , CeO 2 , and ZrO 2 on γ-Al 2 O 3 using Atomic Layer Deposition (ALD). The structure of the films was characterized by XRD and STEM, and catalysts with ~ 1-wt% Pd were examined for CO and CH 4 oxidation. CeO 2 /γ-Al 2 O 3 was unique among the supports in greatly stabilizing the Pd dispersion to 1173 K. Rates for CO oxidation were enhanced by the presence of CeO 2 , Fe 2 O 3 , and MnO 2 , while the other oxides had no promotional effect. For CH 4 oxidation, only NiO and Co 3 O 4 were modest promoters, while the other reducible oxides even showed a negative effect on rates. Possible reasons for the differences between CH 4 and CO oxidation activities are discussed. Graphical Abstract