A termetallic catalyst of Pt-Ir-Au/Al2O3 for NOx decomposition was prepared by loading the metallic colloids in C2H5OH-H2O solution and a surfactant of polyvinyl pyrrolidone. Compared with an impregnated Pt/Al2O3 catalyst, the termetallic catalyst of PtIrAu811/Al2O3, with a Pt:Ir:Au atomic ratio of 8:1:1, exhibited higher NO decomposition and selectivity to N2. Transmission electron microscopy and X-ray diffraction were conducted to clarify the state of the supported metals and indicate three precious metals alloyed on the catalyst. In the study of NO-temperature programmed desorption, oxygen desorption on the PtlrAu811 catalyst shifted to the low temperature side compared to that on Pt/Al2O3, which correlated well with its higher catalytic performance in NO decomposition.
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