Zhang Xin, Wang Hai, Xu Bo-Qing
Innovative Catalysis Program, Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
J Phys Chem B. 2005 May 19;109(19):9678-83. doi: 10.1021/jp050645r.
Nanosize effect of ZrO2 in Au/ZrO2 catalyst was studied by deposition-precipitation of Au nanoparticles in similar sizes (4-5 nm) on ZrO2 nanoparticles of varying sizes. The catalysts were characterized with XRD, TEM, XPS, and nitrogen adsorption to understand the effect of ZrO2 particle size on the catalytic nanostructures. Nanocomposite Au/ZrO2 catalysts consisting of comparably sized Au-metal (4-5 nm) and ZrO2 (5-15 nm) nanoparticles are found advantageous over those containing similarly sized Au-metal but larger ZrO2 (40-200 nm) particles for CO oxidation. This finding may have important implications on the designed preparation of advanced nanostructured catalysts and other chemical materials.
通过将尺寸相似（4 - 5纳米）的金纳米颗粒沉积沉淀在不同尺寸的二氧化锆纳米颗粒上，研究了Au/ZrO₂催化剂中二氧化锆的纳米尺寸效应。采用X射线衍射（XRD）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和氮气吸附对催化剂进行表征，以了解二氧化锆粒径对催化纳米结构的影响。发现由尺寸相当的金金属（4 - 5纳米）和二氧化锆（5 - 15纳米）纳米颗粒组成的纳米复合Au/ZrO₂催化剂，在CO氧化方面优于那些含有尺寸相似的金金属但二氧化锆颗粒更大（40 - 200纳米）的催化剂。这一发现可能对先进纳米结构催化剂和其他化学材料的设计制备具有重要意义。
