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EnglishModification 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 0.4 nm 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% O2 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.
| Titolo: | Modification of Pd/CeO2 catalyst by Atomic Layer Deposition of ZrO2 |
| Autori: | |
| Data di pubblicazione: | 2016 |
| Rivista: | |
| Abstract: | 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 0.4 nm 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% O2 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. |
| Handle: | http://hdl.handle.net/11368/2891880 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.apcatb.2015.12.028 |
| URL: | http://www.sciencedirect.com/science/article/pii/S0926337315303131 |
| Appare nelle tipologie: | 1.1 Articolo in Rivista |
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| 1-s2.0-S0926337315303131-main.pdf | main text | Documento in Versione Editoriale | Digital Rights Management non definito | Administrator Richiedi una copia |
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http://hdl.handle.net/11368/2891880
