High performance deNOx catalysts with saving Pt metal by using a hierarchical combination technique

将磷酸铝负载的铂催化剂与固体酸性金属氧化物如沸石进行物理结合。该复合催化剂以氢气为还原剂，具有良好的NOx净化活性。漫反射红外傅里叶变换光谱表明，反应过程中生成的氨基中间体稳定地吸附在金属氧化物的BR-OASH酸位上，对NOx起到了类似NH3-SCR反应的良好的还原作用，具有较高的氮气选择性。

Aluminium phosphate supported platinum catalysts was physically combined with solid acidic metal oxides, e. g. zeolite. Such combined catalysts possessed good NOx purification activity by using hydrogen as a reducer. Diffuse reflectance infrared Fourier transform spectroscopy revealed that ammonia intermediate species generated during the reaction stably adsorbed at Br & oslash ; nsted acid sites of metal oxides and served as a good reducer against NOx like a NH_3-SCR reaction, resulting in high nitrogen selectivity.