Preparation of Au/TiO2 Catalyst by a Liquid-Phase Reduction Method for Preferential Oxidation of Carbon Monoxide in a Hydrogen Rich-Stream (CO-PROX reaction)

Au nanoparticles supported on TiO2 were prepared by a liquid-phase reduction method using HAuCl4.3H2O as the Au precursor, TiO2 as the support, a solution of ethylene glycol/water as solvent and reducing agent and sodium citrate as reducing agent and stabilizer. The Au/TiO2 catalysts were prepared using different routes and characterized by Energy-dispersive X-ray spectroscopy, X-ray diffraction and Transmission Electron Microscopy and tested for preferential oxidation of carbon monoxide in hydrogen-rich stream (CO-PROX reaction). The way that the Au precursor, the TiO2 support and the sodium citrate is added to the ethylene glycol/water solution strongly influences the Au nanoparticle sizes and the catalytic activity of the obtained materials.

以二氧化钛（TiO₂）为载体的金纳米颗粒催化剂，采用液相还原法制备：以四氯合金(III)酸三水合物（HAuCl₄·3H₂O）作为金前驱体，二氧化钛（TiO₂）作为载体，乙二醇/水溶液作为溶剂与还原剂，柠檬酸钠作为还原剂与稳定剂。本研究通过多条不同制备路径得到Au/TiO₂催化剂，并采用能量色散X射线光谱（Energy-dispersive X-ray spectroscopy）、X射线衍射（X-ray diffraction）与透射电子显微镜（Transmission Electron Microscopy）对其进行表征，同时针对富氢气氛下的一氧化碳优先氧化反应（CO-PROX反应）开展催化性能测试。金前驱体、二氧化钛载体及柠檬酸钠向乙二醇/水溶液中的添加方式，对所得金纳米颗粒的尺寸与催化材料的催化活性具有显著影响。