Effect of the oxidation state of gold on the complete oxidation of isobutane on Au/CeO2 catalysts |
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Authors: | Fang Yinga Shuiju Wang Chak-Tong Au and Suk-Yin Lai |
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Affiliation: | (1) Institute of General and Ecological Chemistry, Technical University of Ł?dź, Żeromskiego 116, 90-924 Ł?dź, Poland;(2) Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Colombia, Sede Manizales, Colombia; |
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Abstract: | Catalysts of highly dispersed gold supported on ceria were prepared by deposition precipitation method. Au is dispersed as
Au0, Au+ and Au3+ species on ceria. The content of Au+ and Au3+ was highest on catalyst prepared on uncalcined ceria, which possess least ordered surface. It is inferred that oxygen vacancy
on disordered ceria surface is essential for the preparation of highly dispersed gold catalysts and in stabilizing monolayer
surface Au+ clusters while cationic vacancies are sites for substitutional Au3+. Au/CeO2 catalysts showed low-temperature isobutane oxidation activity with maximum conversion at 150–180°C. Ex-situ XPS results demonstrated
that the low temperature isobutane oxidation activity was closely related to the content of Au+ which we interpreted as surface gold oxide formed under reaction conditions. Isobutane oxidation activity associated with
ceria at temperature above 300°C was enhanced by substitutional Au3+. |
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