Solid Superacid Catalysts Based on Tungsten Oxide

基于氧化钨的固体超强酸催化剂

• 批准号: 9510575
• 负责人: Enrique Iglesia
• 金额: $ 43.49万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-01 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9510575&HistoricalAwards=false
• 关键词: Solid; Superacid; Catalysts; Based; Tungsten; Solid; Superacid; Catalysts; Based; Tungsten

ABSTRACT CTS-9510575 This joint effort between the University of California at Berkeley, Exxon Corporation and the Metropolitan Autonomous University at Iztapalapa, Mexico, involves the synthesis and characterization of solid "superacids" based on tungsten oxide dispersed as isolated species, clusters, or films on the surface of zirconia or titania. Previous work has shown that tungsten oxide on zirconia has catalytic activity for isomerization of higher alkanes without the cracking caused by other "superacids". In order to improve the catalytic activity, higher surface areas are desirable. This work includes detailed study of the solid-state processes involved in the precipitation of high-surface-area zirconium and titanium oxides and in the dispersion of tungstate groups on their surfaces. Structural studies are performed using X-ray diffraction and absorption techniques, electron microscopy, and infrared and Raman spectroscopies; acid-site densities and chemistry are probed using site titrations and catalytic reactions of propylene and dimethylcyclohexane. These studies are complemented with mechanistic studies using in-situ infrared spectroscopy and isotope jump techniques. Branched alkanes have great value as octane enhancers in gasoline, lubricant components, and chemical feedstocks. Traditionally, these have been made using one of several processes employing liquid acids, but it is generally accepted that these processes will soon be replaced by new processes using solid acids. Among the advantages sought in this move are easier containment, less corrosiveness, environmental benignity, and improved selectivity. This effort is supported jointly by the Chemical Reaction Processes Program (CTS), the Solid State Chemistry and Polymers Program (DMR), and the Americans Program (INT). ***

ABSTRACT CTS-9510575 This joint effort between the University of California at Berkeley, Exxon Corporation and the Metropolitan Autonomous University at Iztapalapa, Mexico, involves the synthesis and characterization of solid "superacids" based on tungsten oxide dispersed as isolated species, clusters, or films on the surface of zirconia or titania. 先前的工作表明，锆石上的氧化氧化物具有催化活性，可以使较高的烷烃异构化，而没有其他“超酸”引起的破裂。 为了改善催化活性，需要更高的表面积。 这项工作包括对高表面 - 面积锆和氧化钛的沉淀的固态过程的详细研究以及在其表面上的钨基团的分散。 使用X射线衍射和吸收技术，电子显微镜以及红外和拉曼光谱镜进行结构研究。 使用丙烯和二甲基环己烷的位点滴定和催化反应探测酸性位点的密度和化学。 这些研究与原位红外光谱和同位素跳跃技术相辅相成。 分支的烷烃具有巨大的价值，作为汽油，润滑剂成分和化学原料中的辛烷值增强剂。 传统上，这些过程是使用使用液态酸的几个过程之一制成的，但是人们普遍认为，这些过程很快将被使用固体酸的新过程所取代。 在此举中寻求的优势包括更容易遏制，较少的腐蚀性，环境良性和提高的选择性。 这项工作得到了化学反应过程计划（CTS），固态化学和聚合物计划（DMR）和美国人计划（INT）共同支持。 ***