Simple, Scientific Syntheses of Bimetallic and Mixed Oxide Catalysts

建议标题：简单、科学地合成双金属和混合氧化物催化剂建议编号：CTS-0626505主要研究员：John R.Regalbuto研究所：伊利诺伊大学芝加哥分校正在通过研究贵金属浸渍过程中发生的基本现象，在将催化剂制备艺术转化为科学方面取得进展。在过去NSF的支持下，已经表明贵金属配位络合物在浸渍过程中被许多氧化物和碳吸收可以用简单的静电机理来描述。在许多情况下，单层吸附的络合物的高分散性在还原过程中被保留，并产生高度分散的金属。目前提案中的工作假设是，可以在纳米尺度上实现对含有两个氧化物组分的表面的金属吸附的静电控制：可以将“强静电吸附”方法扩展到提供一种简单、科学的方法，利用廉价的普通前驱体制备广泛的双金属和促进型催化剂。在促进剂/载体表面，控制pH值以实现金属络合物在促进剂而不是载体上的选择性吸附。通过选择性地将第二个金属络合物吸附到第一个金属的前驱体氧化相上，然后还原紧密接触的金属，将合成双金属化合物。这些努力旨在通过更好地了解共同的前兆和方法来最大限度地利用它们。希望拟议工作的成功示范将导致对双金属和促进催化剂制备的理解和实践的巨大飞跃。潜在的科学影响非常广泛，影响到使用双金属和氧化物促进催化剂的化学工业的方方面面。在教育和多样性影响方面，REU计划坚定地融入研究实验室的运作。拟议工作的第三个研究重点是专门为REU学生制定的；这项工作将相对容易进行，令人兴奋，并将在同行评估的出版物和会议报告中引起注意。多样性一直是并将继续是REU计划的一个标志。

AbstractProposal Title: Simple, Scientific Syntheses of Bimetallic and Mixed Oxide Catalysts Proposal Number: CTS-0626505Principal Investigator: John R. RegalbutoInstitution: University of Illinois at ChicagoSolid headway is being made to "transform the art of catalyst preparation into a science" by studying the fundamental phenomena that occur during noble metal impregnation. With past support from NSF, it has been shown that the uptake of noble metal coordination complexes over many oxides and carbons during impregnation can be described in terms of a simple electrostatic mechanism. In many cases, the high dispersion of the monolayer-adsorbed complexes is retained during reduction and yields highly dispersed metals. The working hypothesis in the current proposal is that electrostatic control of metal adsorption can be achieved at the nanoscale over surfaces containing two oxide fractions: the "strong electrostatic adsorption" method can be extended to provide a simple, scientific method to prepare a wide range of bimetallic and promoted catalysts using cheap, common precursors. Over promoter/support surface, pH will be controlled to achieve selective adsorption of the metal complex onto the promoter and not the support. Bimetallics will be synthesized by adsorbing a second metal complex selectively onto a precursor oxide phase of the first metal and then reducing the intimately contacted metals. These efforts are directed toward getting the most out of common precursors and methods by understanding them better. It is hoped that successful demonstrations of the proposed work will lead to great leaps forward in the understanding and practice of bimetallic and promoted catalyst preparation. The potential scientific impact is extremely broad, affecting all facets of the chemical industry which employ bimetallic and oxide promoted catalysts.On education and diversity impact, the REU program is firmly integrated into the operation of the research laboratory. The third research thrust of the proposed work has been formulated specifically for REU students; this work will be relatively easy to undertake, exciting to do, and will get noticed in peer evaluated publications and conference presentations. Diversity has been and will continue to be a hallmark of the REU program.