The catalytic oxidation performance toward ethylene oxide (EO) and the consequent mechanism were investigated on the Pt-Ru/CuCeO_x bimetallic catalyst, which was prepared by a distinct method combining stepwise adsorption and subsequent impregnation. The catalytic tests show that the introduction of Ru into the Pt catalyst, so as to form Pt-Ru bimetallic active sites, can greatly increase the oxidation activity of the catalyst, as evidenced by the extremely lower full oxidation temperature (120 °C) when compared with that of the Pt/CeO₂ catalyst (160 °C). The XPS spectra show that the Ru species (mainly RuO_x) have strong interaction with the CuCeO_x support, which can therefore affect the electron transfer between the Pt species and the support. As a result, the oxygen activation on Pt species is obviously facilitated and catalytic activity is enhanced. Finally, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs) was used to track the reaction mechanism. It is found that the catalytic oxidation process follows the MvK catalytic mechanism at low temperature and the L-H catalytic mechanism when the temperature moves to higher range.

研究了 Pt-Ru/CuCeO _x双金属催化剂对环氧乙烷 (EO) 的催化氧化性能及其机理，该催化剂通过逐步吸附和后续浸渍相结合的独特方法制备。催化测试表明，将Ru引入Pt催化剂中，形成Pt-Ru双金属活性位点，可以大大提高催化剂的氧化活性，当当与 Pt/CeO ₂催化剂 (160 °C)相比。XPS 谱图表明 Ru 物种（主要是 RuO _x）与 CuCeO _{x具有很强的相互作用}载体，因此会影响 Pt 物种和载体之间的电子转移。结果，明显促进了Pt物种上的氧活化并增强了催化活性。最后，使用原位漫反射红外傅立叶变换光谱 (DRIFT) 跟踪反应机理。发现催化氧化过程在低温下遵循MvK催化机制，当温度升高时遵循LH催化机制。