Supported Ru catalysts prepared by two sonication-assisted methods for preferential oxidation of CO in H₂

TY - JOUR

T1 - Supported Ru catalysts prepared by two sonication-assisted methods for preferential oxidation of CO in H2

AU - Perkas, Nina

AU - Teo, Jaclyn

AU - Shen, Shoucang

AU - Wang, Zhan

AU - Highfield, James

AU - Zhong, Ziyi

AU - Gedanken, Aharon

PY - 2011/9/14

Y1 - 2011/9/14

N2 - The preferential oxidation (PROX) of CO in the presence of H2 is an important step in the production of pure H2 for industrial applications. In this report, two sonochemical methods (S1 and S2) were used to prepare highly dispersed Ru catalysts supported on mesoporous TiO2 (TiO2(MSP)) for the PROX reaction, in which a reaction gas mixture containing 1% CO + 1% O2 + 18% CO2 + 78% H2 was used. The supported Ru catalysts performed better than the supported Au and Pt catalysts, and the S1 and S2 methods are superior to the impregnation method. The Ru/TiO2(MSP) catalysts were active for the PROX reaction below 200 °C and good for the methanation reactions of CO and CO2 above 200 °C. The presence of residual chlorine in the catalysts severely suppressed their PROX reaction activity, and a higher dispersion of Ru particles led to better catalytic performances. The addition of Au in the Ru/TiO 2(MSP) catalyst also caused a poorer catalytic activity for both the PROX and the methanation reactions. TPR results showed that in the active catalysts prepared by the S1 and S2 methods, the well dispersed Ru particles, after calcination in air, had a stronger interaction with the support than those in the catalyst prepared by the impregnation method and in the Au-Ru/TiO 2(MSP) catalyst. In situ CO absorption experiments performed with the diffusion reflectance Fourier transform infra red (DRIFT) method showed that the bridged adsorbed CO species on isolated Ru0 sites correlated with the catalytic performances, indicating that these isolated Ru0 sites are the most active sites of the Ru/TiO2(MSP) catalysts in the PROX reaction. This journal is

AB - The preferential oxidation (PROX) of CO in the presence of H2 is an important step in the production of pure H2 for industrial applications. In this report, two sonochemical methods (S1 and S2) were used to prepare highly dispersed Ru catalysts supported on mesoporous TiO2 (TiO2(MSP)) for the PROX reaction, in which a reaction gas mixture containing 1% CO + 1% O2 + 18% CO2 + 78% H2 was used. The supported Ru catalysts performed better than the supported Au and Pt catalysts, and the S1 and S2 methods are superior to the impregnation method. The Ru/TiO2(MSP) catalysts were active for the PROX reaction below 200 °C and good for the methanation reactions of CO and CO2 above 200 °C. The presence of residual chlorine in the catalysts severely suppressed their PROX reaction activity, and a higher dispersion of Ru particles led to better catalytic performances. The addition of Au in the Ru/TiO 2(MSP) catalyst also caused a poorer catalytic activity for both the PROX and the methanation reactions. TPR results showed that in the active catalysts prepared by the S1 and S2 methods, the well dispersed Ru particles, after calcination in air, had a stronger interaction with the support than those in the catalyst prepared by the impregnation method and in the Au-Ru/TiO 2(MSP) catalyst. In situ CO absorption experiments performed with the diffusion reflectance Fourier transform infra red (DRIFT) method showed that the bridged adsorbed CO species on isolated Ru0 sites correlated with the catalytic performances, indicating that these isolated Ru0 sites are the most active sites of the Ru/TiO2(MSP) catalysts in the PROX reaction. This journal is

UR - http://www.scopus.com/inward/record.url?scp=80052125430&partnerID=8YFLogxK

U2 - 10.1039/c1cp21870k

DO - 10.1039/c1cp21870k

M3 - 文章

C2 - 21799973

AN - SCOPUS:80052125430

SN - 1463-9076

VL - 13

SP - 15690

EP - 15698

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 34

ER -