The Extension of a Scientific Model of Catalyst Impregnation

本项目的目的是研究金属络合物在高比表面积载体上的浸渍。将对选定的金属络合物在几种载体上的吸附进行模拟和实验研究。在以前的工作中，修正的物理吸附(RPA)模型被成功地应用于六氯铂酸盐在氧化铝上的吸附。在本项目中，将检验该模型对其他类型的金属络合物和其他常见氧化物载体的通用性。将对一系列金属和载体进行测试，以隔离相关参数的影响，如零电荷的氧化点和介电常数。该模型将测试其对催化的适用性。虽然吸附步骤的模型是有用的，但它必须确定作为干燥和催化剂预处理的函数，金属的初始沉积保持到什么程度。模型的预测表明，铂络合物以单分子膜的形式沉积在氧化物表面。通过化学和热处理去除水合层和配体时，铂颗粒聚集或迁移的程度将被量化。这项工作可能适用于催化和去除水中的重金属。

The objective of this project is to study the impregnation of metal complexes on high surface-area supports. Modeling and experimental studies on the adsorption of selected metal complexes on several supports will be carried out. In previous work the Revised Physical Adsorption (RPA) model was successfully applied to hexachloroplatinate on alumina. In this project the generality of the model to other types of metal complexes and other common oxide supports will be tested. A series of metals and supports will be tested to isolate the effects of pertinent parameters such as the oxide point of zero charge and the dielectric constant. The model will be tested for its applicability to catalysis. Although a model of the adsorption step is useful, it must be determined to what degree the initial deposition of metal is maintained as a function of drying and catalyst pretreatment. Predictions from the model indicate that platinum complexes are deposited as a monolayer on the oxide surface. The extent to which platinum particles agglomerate or migrate as the hydration sheaths and ligands are removed by chemical and thermal treatments will be quantified. This work is potentially applicable to catalysis and the removal of heavy metals from water streams.