Thermodynamic Measurements of Redox Properties of Supported Oxide Catalysts

建议标题：负载型氧化物催化剂氧化还原性质的热力学测量建议编号：CTS-0625324主要研究员：John A.Vohs研究所：宾夕法尼亚大学分析(决策的基本原理)：这项研究计划将开发库仑滴定技术的新应用，以直接测量负载型单层、金属氧化物和选择性氧化催化剂的氧化和还原热。这一分析技术将首先用于表征负载型钼催化剂，也可能用于负载型钒和氧化铬催化剂。该计划将首次使用库仑滴定测量来直接测量负载型氧化物催化剂的氧化热和氧化熵。这些测量将在表征良好的负载型金属氧化物催化剂上进行，作为催化剂装载量和载体组成的函数，以加深对这些参数如何影响催化剂性能的基本了解。这些数据将与文献中的结果相关联，以了解热力学性质如何与催化性能相关。这些关联将显著提高人们对这些具有商业重要性的催化剂的活性和选择性的理解。这项工作的一个重要成果将是开发一种新的、普遍适用的技术，用于测量氧化催化剂的关键但难以获得的性质。第二个重要成果将是对负载型氧化物催化剂的结构和组成如何影响这些商业上重要材料的氧化热能和自由能的新见解。最后，对使负载型氧化物具有活性和选择性的催化剂的因素有了重要的见解。这项工作的教育影响也将是巨大的。除了将进行大部分研究的博士生培训外，该项目还将包括本科生和高中生的教育。研究项目的一部分将由工科本科生和高中生在学年和暑期进行。

AbstractProposal Title: Thermodynamic Measurements of Redox Properties of Supported Oxide Catalysts Proposal Number: CTS - 0625324Principal Investigator: John A. VohsInstitution: University of PennsylvaniaAnalysis (rationale for decision): This research program will develop a novel application of a Coulomb titration technique to directly measure the heats of oxidation and reduction of supported monolayer, metal oxide, and selective oxidation catalysts. This analysis technique will then initially be used to characterize supported molybdena catalysts, and potentially also supported vanadia and chromia catalysts. This program will directly measure, for the first time, the enthalpies and entropies of oxidation of supported oxide catalysts using Coulomb titration measurements. The measurements will be performed on well-characterized, supported metal oxide catalysts as a function of catalyst loading and support composition in order to develop a fundamental understanding of how these parameters affect catalyst performance. The data will be correlated with results from the literature in order to understand how the thermodynamic properties relate to catalytic performance. These correlations will significantly improve the understanding of what makes these commercially important catalysts active and selective. One important outcome of this work will be the development of a new, generally applicable technique for measuring critical, but difficult to obtain, properties of oxidation catalysts. A second important outcome will be the generation of new insights into how the structure and composition of supported oxide catalysts affect the enthalpies and free energies of oxidation for these commercially important materials. Finally, important insights into the factors that make supported oxides active and selective catalysts will be obtained. The educational impact of this work will also be significant. In addition to training of the PhD students that will carry out the majority of the research, education of both undergraduates and high school students will be included in the project. A portion of the research program will be performed by both undergraduate engineering students and by high-school students, during the school year and over the summers.