TITLE:
Nanosized Au Catalysts Supported on Mg(OH)2-CeO2 for Preferential Oxidation of CO in Hydrogen Stream
AUTHORS:
Yu-Wen Chen, Anton S. Brichkov, Vladmir V. Kozik
KEYWORDS:
Gold, CO Oxidation, Hydrogen Energy, Cerium Oxide
JOURNAL NAME:
Modern Research in Catalysis,
Vol.8 No.2,
April
30,
2019
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.