Layered double hydroxide confined Au colloids: High performance catalysts for low temperature CO oxidation

A LDH confined Au nano-catalyst has been successfully synthesized through a flocculation and in-situ reduction method. In this composite, Au nano-colloids were evenly dispersed in LDH gallery and its particle size was less than 1 nm. The highly dispersed gold nano-colloids in layered Mg-Al double hydroxide support were found to be a high performance catalyst for CO lower temperature oxidation. The catalytic experiments indicated that the CO oxidation reaction could be initiated at lower than -30 degrees C and almost a 100% conversion can be achieved at 0 degrees C. The catalyst stability studies show that after 12 h reaction at 0 degrees C; the CO conversion has not any apparent decrease. (C) 2012 Elsevier B.V. All rights reserved.