Hong Xiaowei, Sun Ye, Zhu Tianle, Liu Zhiming
School of Space and Environment, Beihang University, Beijing 100191, China.
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Molecules. 2017 Feb 27;22(3):351. doi: 10.3390/molecules22030351.
A series of nanostructured Pt-Au/MO-CeO₂ (M = Mn, Fe, Ti) catalysts were prepared and their catalytic performance for the co-oxidation of carbon monoxide (CO) and hydrogen (H₂) were evaluated at room temperature. The results showed that MO promoted the CO oxidation of Pt-Au/CeO₂, but only the TiO₂ could enhance co-oxidation of CO and H₂ over Pt-Au/CeO₂. Related characterizations were conducted to clarify the promoting effect of MO. Temperature-programmed reduction of hydrogen (H₂-TPR) and X-ray photoelectron spectroscopy (XPS) results suggested that MO could improve the charge transfer from Au sites to CeO₂, resulting in a high concentration of Ce and cationic Au species which benefits for the CO oxidation. In-situ diffuse reflectance infrared Fourier transform spectroscopy (In-situ DRIFTS) results indicated that TiO₂ could facilitate the oxidation of H₂ over the Pt-Au/TiO₂-CeO₂ catalyst.
制备了一系列纳米结构的Pt-Au/MO-CeO₂（M = Mn、Fe、Ti）催化剂，并在室温下评估了它们对一氧化碳（CO）和氢气（H₂）共氧化的催化性能。结果表明，MO促进了Pt-Au/CeO₂的CO氧化，但只有TiO₂能增强Pt-Au/CeO₂上CO和H₂的共氧化。进行了相关表征以阐明MO的促进作用。氢气程序升温还原（H₂-TPR）和X射线光电子能谱（XPS）结果表明，MO可以改善从Au位点到CeO₂的电荷转移，从而产生高浓度的Ce和阳离子Au物种，这有利于CO氧化。原位漫反射红外傅里叶变换光谱（原位DRIFTS）结果表明，TiO₂可以促进Pt-Au/TiO₂-CeO₂催化剂上H₂的氧化。
