Modification of Pd/CeO2 catalyst by Atomic Layer Deposition of ZrO2

作者：Onn Tzia Ming^*; Arroyo Ramirez Lisandra; Monai Matteo; Oh Tae Sik; Talati Meghavi; Fornasiero Paolo; Gorte Raymond J; Khader Mahmoud M

来源：Applied Catalysis B: Environmental , 2016, 197: 280-285.

DOI：10.1016/j.apcatb.2015.12.028

• Palladium
• Ceria
• Thermal stability
• Atomic Layer Deposition
• Zirconia
• Improved rates
• Methane oxidation
• Water gas shift reaction
• Sulfur poisoning

Modification of a 1 wt% Pd/CeO2 catalyst by Atomic Layer Deposition of thin ZrO2 films was studied. Calcination of the unmodified Pd/CeO2, prepared by precipitation of aqueous Ce(NO3)(3) solutions, with Pd added by impregnation, caused a large decrease in surface area and an increase in crystallite size between 673 K and 1073 K; however, catalysts modified by 0.4nm ZrO2 films showed no change in either surface area or CeO2 crystallite size upon calcination to 1073 K. Methane-oxidation rates in 0.5% CH4 and 5% O-2 were slightly lower on the ZrO2-covered catalyst when both materials were calcined at 673 K but the activity of the ZrO2-modified catalyst did not decrease with catalyst calcination temperature. Both catalysts showed good activity for the water-gas-shift reaction but the ZrO2 film improved sulfur tolerance by preventing formation of cerium sulfates.

• 出版日期2016-11-15