Ru4+ ion in CeO2 (Ce0.95Ru0.05O2−𝛿): A non-deactivating, non-platinum catalyst for water gas shift reaction

Journal of Chemical Sciences

N Mahadevaiah¹  M S Hegde1¹  Preetam Singh¹  Sanjit K Parida¹ 

[1] Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India$$

关键词: WGS reaction;    Ru4+ ion in CeO2;    Pt catalyst;    H2 selectivity.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Hydrogen is a clean energy carrier and highest energy density fuel. Water gas shift (WGS) reaction is an important reaction to generate hydrogen from steam reforming of CO. A new WGS catalyst, Ce1−𝑥Ru𝑥O2−𝛿 (0 ≤ 𝑥 ≤ 0.1) was prepared by hydrothermal method using melamine as a complexing agent. The Catalyst does not require any pre-treatment. Among the several compositions prepared and tested, Ce0.95Ru0.05O2−𝛿 (5% Ru4+ ion substituted in CeO2) showed very high WGS activity in terms of high conversion rate (20.5 𝜇mol.g-1.s-1 at 275°C) and low activation energy (12.1 kcal/mol). Over 99% conversion of CO to CO2 by H2O is observed with 100% H2 selectivity at ≥ 275°C. In presence of externally fed CO2 and H2 also, complete conversion of CO to CO2 was observed with 100% H2 selectivity in the temperature range of 305-385°C. Catalyst does not deactivate in long duration on/off WGS reaction cycle due to absence of surface carbon and carbonate formation and sintering of Ru. Due to highly acidic nature of Ru4+ ion, surface carbonate formation is also inhibited. Sintering of noble metal (Ru) is avoided in this catalyst because Ru remains in Ru4+ ionic state in the Ce1−𝑥Ru𝑥O2−𝛿 catalyst.

【 授权许可】

Unknown