Pt负载复合氧化物催化剂的CO催化发光性能

采用非晶态络合物法制备了La0.9Cu0.1MnO3和LaCoO3钙钛矿催化剂, 并利用固定化溶胶工艺合成了Pt纳米粒子负载的Pt/La0.9Cu0.1MnO3和Pt/LaCoO3复合催化剂. 通过透射电镜(TEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等手段对催化剂的微观结构、形貌及Pt的价态进行了研究; 考察了催化剂的CO催化氧化发光性能. 结果表明, 若La0.9Cu0.1MnO3催化剂表面上负载的Pt纳米颗粒形成团聚, 则在其CO催化氧化发光谱中出现发光峰分裂的现象, 而在Pt纳米颗粒分散较好的Pt/LaCoO3体系中却没有出现这一情况. 因此可以利用CO催化发光谱来初步判断贵金属纳米颗粒在载体表面的分散状态.

CO Cataluminescence Property of Platinum Supported Composite Oxide Catalysts

La0.9Cu0.1MnO3 and LaCoO3 catalysts were synthesized by amorphous complexing method. Platinum nanoparticles supported by these composite oxide catalysts were prepared by using colloid deposition process. The structure, morphology, and Pt valence of the catalysts were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS); and the cataluminescence (CTL) response of CO over the catalysts was investigated. Because of the agglomeration of Pt nanoparticles at the surface of La0.9Cu0.1MnO3 catalyst, its cataluminescence spectra displayed a peak splitting, but the Pt/LaCoO3 system, where Pt nanoparticles dispersed well at its surface, did not exhibit the phenomenon. We can use the cataluminescence spectra of CO to determine the dispersed state of noble metal nanoparticles at the surface of supports.