Acidity and Mechanism in Reactions Catalyzed By Strong Acid Catalyst, Solid and Liquid

强酸固体和液体催化剂催化反应的酸度和机理

• 批准号: 0003875
• 负责人: Dan Farcasiu
• 金额: $ 25.2万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003875&HistoricalAwards=false
• 关键词: Acidity; Mechanism; Reactions; Catalyzed; Strong

The objective of this proposal is to develop consistent methods for determining the acidity functions of solid acid catalysts. Three components are proposed: evaluation of Lewis acidity by complexation of linear ethers, examination of Bronsted sites by adsorption of pyridine derivatives, and exploration of reaction mechanisms associated with conversation of saturated hydrocarbons. One aspect will be the development of a quantitative scale for Lewis acidity using ethers as bases and nuclear magnetic resonance as the probe. The dependence of acid strength on local curvature has been observed and will be investigated. In addition to a calibration of acid strength from equilibrium measurements as higher temperatures, reactions of hydrocarbons on zeolites at lower temperatures, where thermal activation is less important, will be studied. The reactants chosen, paraffins and cycloparaffins, are those that require the greatest strength of catalyst for an acid-catalyzed reaction. This work will help provide a clearer, fundamental understanding of some newer-generation solid acids such as zirconia-supported sulfates and heteropolyacids.

该提案的目的是开发一致的方法来确定固体酸催化剂的酸性功能。 拟议的三个组成部分：通过线性醚的络合作用评估刘易斯酸性，通过吡啶衍生物的吸附检查布朗斯台德位点，以及探索与饱和烃转化相关的反应机理。 其中一个方面将是发展一个定量尺度的刘易斯酸度使用醚作为基地和核磁共振作为探针。 酸强度对局部曲率的依赖性已被观察到，并将进行研究。 除了校准酸强度从平衡测量作为较高的温度，在较低的温度下，其中热活化是不太重要的烃在沸石上的反应，将进行研究。 所选择的反应物，链烷烃和环烷烃，是那些需要最大强度的催化剂用于酸催化反应的反应物。 这一工作将有助于对新一代固体酸如氧化锆负载的硫酸盐和杂多酸有一个更清晰、更基本的认识。