U.S.-Mexico Cooperative Research: The Formation of Supported Bimetallic Clusters with Emphasis on the Effect of Support

该奖项将支持伊利诺伊大学芝加哥分校的理查德·D·冈萨雷斯教授与位于伊斯塔巴拉帕的墨西哥大都会大学的里卡多·戈麦斯教授合作。最近完成的研究表明，金属-前体-载体相互作用对于决定负载型多金属催化剂的表面组成是重要的。特别是，流动的表面金属前体的存在导致该金属在所得到的双金属催化剂中的表面浓缩。研究人员的目标是使用漫反射紫外光光谱来鉴定这些前体-表面复合体的结构。金属-载体相互作用的强度将通过使用定量差示扫描量热仪来测量，所得到的双金属颗粒的元素组成将通过色散X射线光谱分析(EDXS)来获得。EDXS还将用于研究颗粒间金属相关系。这项拟议的研究将在芝加哥的伊利诺伊大学和位于伊斯塔巴拉帕的墨西哥大都会大学同时进行。原位漫反射UV研究、微量热DSC研究和催化剂表征研究，包括表面组成测量，将在伊利诺伊大学进行。催化探针反应和EDXS研究的主要部分将在墨西哥进行。

This award will support Professor Richard D. Gonzalez of the University of Illinois at Chicago Circle in collaboration with Professor Ricardo Gomez of the Metropolitan University of Mexico at Iztapalapa. Studies recently completed suggest that metal-precursor-support interactions are important in determining the resulting surface composition of supported multimetallic catalysts. In particular, the presence of a mobile surface metal-precursor results in the surface enrichment of that metal in the resulting bimetallic catalyst. The investigators aim to identify the structure of these precursor-surface complexes using diffuse U.V. reflectance spectroscopy. The strength of the metal-support interactions will be measured through the use of quantitative differential scanning calorimetry and the elemental composition of the resulting bimetallic particles will be obtained through the use of dispersive x-ray spectroscopy (EDXS). EDXS will also be used to study interparticle metal phase relationships. The proposed research will be carried out simultaneously at the University of Illinois at Chicago and the Metropolitan University of Mexico at Iztapalapa. The in-situ diffuse U.V. reflectance studies, the microcalorimetric DSC studies and the catalyst charac- terization studies, including the surface composition measurements, will be carried out at the University of Illinois. The catalytic probe reactions and major portion of the EDXS studies will be performed in Mexico.