Study of Structures and Chemistry of Multimetallic Hydroisomerization Catalysts

多金属加氢异构化催化剂的结构和化学研究

• 批准号: 9423094
• 负责人: Jonathan Phillips
• 金额: $ 29.4万
• 依托单位: Pennsylvania State Univ University Park
• 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: 1995-02-15 至 1999-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9423094&HistoricalAwards=false
• 关键词: Study; Structures; Chemistry; Multimetallic; Hydroisomerization

Abstract Jonathan Phillips This study tests the hypothesis that catalysts consisting of two compositionally distinct particle surfaces will be superior to simpler catalysts with a single active surface for certain reactions and specifically for hydroisomerization. The design paradigm calls for a small amount of a noble metal (palladium, platinum, rhodium, or iridium) that can dissociate hydrogen, which then spills over to an alloy surface with high selectivity for the desired product; these alloys consist of a base metal (iron or cobalt) and a rare earth (cerium, praseodynium, or lanthanum). Other studies suggest that carbon supports may favor formation of surfaces with the desired structures; supports studied in this work include both high surface-area and low-surface area carbon, graphite, alumina, and silica. Preliminary studies using iron-cerium-palladium on carbon show both high activity and high selectivity for hydroisomerization of 1-butene. In this work partial hydrogenation of butadiene is used as an additional test reaction. Surface and bulk structures of the particles are probed using X-ray diffraction, Mossbauer spectroscopy, microcalorimetry, and transmission electron microscopy. The principal being established in this work should apply to a wide range of industrial processes. The specific systems under study will permit immediate application to the production of "reformulated" gasoline required by the Clean Air Act and should eliminate the cost differential associated with compliance. ***

摘要乔纳森·菲利普斯这项研究验证了这样一种假设，即对于某些反应，特别是对于临氢异构化，由两个不同组成的颗粒表面组成的催化剂将优于具有单一活性表面的简单催化剂。这种设计模式需要少量能够分解氢的贵金属(钯、铂、Rh或Ir)，氢然后溢出到合金表面，对所需产品具有高选择性；这些合金由贱金属(铁或钴)和稀土(Ce、Pr或La)组成。其他研究表明，碳载体可能有利于形成具有所需结构的表面；本工作所研究的载体包括高比表面积和低比表面积的碳、石墨、氧化铝和二氧化硅。初步研究表明，铁-铈-钯催化剂对1-丁烯的加氢异构化反应具有高活性和高选择性。在这项工作中，丁二烯的部分加氢反应被用作附加的试验反应。利用X射线衍射仪、穆斯堡尔谱、微量热法和透射电子显微镜等手段对纳米粒子的表面和体相结构进行了研究。在这项工作中确立的原则应适用于广泛的工业过程。正在研究的具体系统将允许立即应用于《清洁空气法》所要求的“重新配方”汽油的生产，并应消除与合规相关的成本差异。***