氧化石墨负载金催化剂在以O2为氧源的苯甲醇氧化反应中的催化性能:载体效应

对石墨氧化物经过加热处理和化学处理后担载金溶胶从而制备得到不同的Au/GO催化剂.利用X-射线光电子能谱,热脱附谱和拉曼光谱对催化剂的表面物种和结构进行了表征.结果表明,热处理和化学处理对Au/GO催化剂表面含氧物种的浓度、种类以及载体的晶体结构具有显著影响,进而导致催化剂在以O₂为氧源的液相苯甲醇选择氧化反应中的催化活性呈现明显差异.与载体表面含氧物种的浓度和种类这一因素相比,载体结构的有序程度对于Au/GO催化剂的催化活性起到更为重要的决定作用.     

Pd/C催化剂在乙炔选择加氢反应中的催化性能：载体效应

Pd/C catalysts were prepared by deposited Pd nanoparticles (NPs) on different carbon supports including activated carbon (AC), graphite oxide (GO), and reduced graphite oxide (rGO) using sol-immobilization method. Through transmission electron microscopy, powder X-ray di raction, and X-ray photoelectron spectroscopy, the role of the carbon supports for the catalytic performances of Pd/C catalysts was examined in selective hydrogenation of acetylene. The results indicate that Pd/AC exhibited higher activity and selectivity than Pd/GO and Pd/rGO in the gas phase selective hydrogenation of acetylene. Thermal and chemical treatment of AC supports also have some effect on the catalytic performance of Pd/AC catalysts. The differences in the activity and selectivity of various Pd/C catalysts were partly attributed to the metal-support interaction.