CAJ | 학술논문

通过浸渍还原法制备了不同比例的Pt-Mo/SiO2催化剂，采用X射线衍射、透射电镜、X射线近边吸收谱和X射线光电子能谱表征了Pt-Mo/SiO2催化剂的组成、结构及价态。研究结果表明，少量MoOx修饰Pt-Mo/SiO2催化剂在低温水汽变换反应中表现出比Pt/SiO2催化剂更高的催化活性，过量MoOx包覆的Pt-Mo/SiO2催化剂活性较低。低温水汽变换反应活性来自于Pt与表面MoOx的界面协同作用，限域在Pt纳米颗粒表面的MoOx表现出较低价态，高分散MoOx纳米岛修饰的Pt纳米颗粒是低温水汽变换反应的活性结构。
통과침지환원법제비료불동비례적Pt-Mo/SiO2최화제，채용X사선연사、투사전경、X사선근변흡수보화X사선광전자능보표정료Pt-Mo/SiO2최화제적조성、결구급개태。연구결과표명，소량MoOx수식Pt-Mo/SiO2최화제재저온수기변환반응중표현출비Pt/SiO2최화제경고적최화활성，과량MoOx포복적Pt-Mo/SiO2최화제활성교저。저온수기변환반응활성래자우Pt여표면MoOx적계면협동작용，한역재Pt납미과립표면적MoOx표현출교저개태，고분산MoOx납미도수식적Pt납미과립시저온수기변환반응적활성결구。
Pt-Mo/SiO2 catalysts were prepared using impregnation-reduction methods. Mo-promoted Pt cata-lysts exhibit much higher water gas shift reaction activity at low temperatures than Pt/SiO2 cata-lysts. Various characterization methods including inductive coupled plasma atomic emission spec-trometry, X-ray diffraction, transmission electron microscopy, X-ray absorption near edge spec-trum, and X-ray photoelectron spectroscopy were applied to investigate the composition, structure and chemical state of the Pt-Mo/SiO2 catalysts. Our results indicate that the added Mo species effec-tively improves the dispersion of Pt nanoparticles and the synergistic effect between the Pt nano-particles and surface MoOxspecies enhances the catalytic performance for the water gas shift reac-tion. Pt nanoparticles decorated with highly dispersed MoOx patches are found to be the active ar-chitecture.