A new two-step method of combining colloid synthesis and incipient wetness impregnation routes was followed for the synthesis of a Pt-PdO bimetallic catalyst for methane combustion. The catalyst was characterized by powder XRD, XPS, TPO and in-situ DRIFTS. The results have demonstrated that there is almost no PtPd alloy formed over the bimetallic catalyst. Compared with the bimetallic catalyst of same nominal composition prepared by the traditional incipient wetness impregnation method, the redox properties of the catalyst were significantly improved. The catalyst showed an exceptional low-temperature activity for methane oxidation. It was found that the concentration of hydroxyl groups over the catalyst was greatly reduced during methane combustion. The present study may provide a general method for the preparation of bimetallic nanoparticles with high activity towards other heterogeneous catalytic reactions.

遵循一种新的两步法，将胶体合成与初期湿润浸渍路线相结合，以合成用于甲烷燃烧的Pt-PdO双金属催化剂。用粉末XRD，XPS，TPO和原位DRIFTS表征催化剂。结果表明，在双金属催化剂上几乎没有形成PtPd合金。与传统的初湿浸渍法制备的相同标称组成的双金属催化剂相比，该催化剂的氧化还原性能得到了显着提高。该催化剂显示出优异的甲烷氧化低温活性。发现在甲烷燃烧期间，催化剂上的羟基浓度大大降低。