Preparation of highly dispersive supported gold catalyst by microbial reduction method

After widely screening, a kind of bacteria was obtained, which is easy to culture and has strong ability of reducing Au3+, Au-0. It was used to prepare the. highly dispersive Au/alpha-Fe2O3 catalyst by in situ reducing the Au3+ ions impregnated on alpha-Fe2O3 supporter to Au-0 particles, with a mean size of 5 nm, under the condition of 28 degrees C and pH 4.5. The reductive degree of Au3+ was up to 100 %. This catalyst showed good catalytic property for the oxidation of carbon monoxide, the percent conversion of 1.5 % CO, balanced with air was up to 100 % under the condition of 25 similar to 28 degrees C and GHSV 500mL.h(-1).g(-1), and the percent conversion of 100 ro lasted for 75 h at 25 degrees C.