Abstract
Preferential oxidation of carbon monoxide in the presence of hydrogen (PROX) is a promising method to remove CO from a hydrogen-containing gas mixture. Nanosized gold catalyst supported on CeO2 and modified with Mg(OH)2 was used for preferential oxidation of carbon monoxide in hydrogen-rich stream in this study. Mg(OH)2 was added on CeO2 by incipient-wetness impregnation. Au was loaded on Mg(OH)2-CeO2 by deposition-precipitation method. PROX reaction was carried out in a continuous flow, fixed bed reactor. CO/O2 feed ratio was fixed at 1 to magnify the difference of various catalysts. The catalysts were characterized by N2 sorption, TEM, HR-TEM and XPS. Mg(OH)2 formed a thin layer on the surface of CeO2. CeO2 was in the crystalline phase and Mg(OH)2 was amorphous. Au particles were homogeneously dispersed on the support with a size of 2 - 5 nm. Using CeO2 as a support could increase the dispersion of Mg(OH)2 and thus increase the interaction between Au and Mg(OH)2. Adding Mg(OH)2 on Au/CeO2 could suppress H2 oxidation and therefore increase CO oxidation activity.
Highlights
The hydrogen containing mixture used to feed portable power units based on proton-exchange membrane fuel cells (PEMFCs) is obtained through the conversion of hydrocarbon with steam reforming
Nanosized gold catalyst supported on CeO2 and modified with Mg(OH)2 was used for preferential oxidation of carbon monoxide in hydrogen-rich stream in this study
CeO2 was in the crystalline phase and Mg(OH)2 was amorphous
Summary
The hydrogen containing mixture used to feed portable power units based on proton-exchange membrane fuel cells (PEMFCs) is obtained through the conversion of hydrocarbon with steam reforming. These mixtures usually contain 0.5 - 2 vol % of CO, 15 - 25 vol % of CO2, and 5 - 10 vol % of water vapor. The preferential oxidation of carbon monoxide in the presence of hydrogen (PROX) is a promising method for removing CO from hydrogen-containing gas mixture [1]-[10].
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