Comparison of the Activities of Pd(0) and Pd(I) in Low-Temperature Oxidation of Carbon Monoxide on the Pd/γ-Al2O3 Catalyst

• Published in: Kinetics and catalysis Vol. 63; no. 2; pp. 226 - 233
• Main Authors: Ustyugov, A. V., Korypaeva, V. V., Obeidat, Z. Z., Putin, A. Yu, Shvarts, A. L., Bruk, L. G.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.04.2022; Springer Nature B.V
• Subjects: Aluminum oxide; Carbon monoxide; Catalysis; Catalysts; Catalytic activity; Chemistry; Chemistry and Materials Science; Deactivation; Low temperature; Oxidation; Palladium; Palladium compounds; Physical Chemistry; Room temperature; Transitional aluminas; alumina; palladium acetate; catalyst deactivation; specific activity; air oxygen; XPS; palladium (I,0); oxidation of carbon monoxide; kinetics
• ISSN: 0023-1584; 1608-3210
• DOI: 10.1134/S0023158422020112

Low-temperature oxidation of carbon monoxide on the Pd/γ-Al 2 O 3 catalyst has been studied at room temperature and atmospheric pressure of air containing 100 mg/m 3 CO. The catalyst became gradually deactivated during the process. Storage of the partially deactivated catalyst in air for 10–12 h resulted in a complete recovery of activity. According to XPS data, the material obtained by depositing Pd 3 (OAc) 6 on γ-Al 2 O 3 before contact with CO contains palladium compounds in the oxidation states I and 0. The specific catalytic activity of palladium compounds in different oxidation states was evaluated based on the correlation between the catalytic activity and the content of Pd(I) and Pd(0) compounds, and it was shown that the activity of the former is higher than that of the latter.