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A termetallic catalyst of Pt‐Ir‐Au/Al 2 O 3 for NO x decomposition was prepared by loading the metallic colloids in C 2 H 5 OH‐H 2 O solution and a surfactant of polyvinyl pyrrolidone. Compared with an impregnated Pt/Al 2 O 3 catalyst, the termetallic catalyst of PtIrAu811/Al 2 O 3 , with a Pt:Ir:Au atomic ratio of 8:1:1, exhibited higher NO decomposition and selectivity to N 2 . 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 PtIrAu811 catalyst shifted to the low temperature side compared to that on Pt/Al 2 O 3 , which correlated well with its higher catalytic performance in NO decomposition.
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Morikawa et al. (2011) studied this question.
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