Microcalorimetric, Kinetic, and Spectroscopic Studies of Multi-component Catalysts for Dehydrogenation of Light Paraffins

轻质石蜡脱氢多组分催化剂的微量热、动力学和光谱研究

• 批准号: 9501032
• 负责人: James Dumesic
• 金额: $ 29.1万
• 依托单位: University of Wisconsin-Madison
• 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: 1995-03-01 至 1998-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9501032&HistoricalAwards=false
• 关键词: Microcalorimetric; Kinetic; Spectroscopic; Studies; Multi

James Dumesic Abstract This study is an extension of an ongoing effort that has shown that platinum and tin supported in potassium-exchanged zeolite-L exhibits high activity and high selectivity for dehydrogenation of isobutane as well as gmod stability under reaction conditions. This finding is examined to elucidate the effects of alkali modification and support properties using reaction kinetics studies, adsorptive microcalorimetric studies, and spectroscopic studies. New catalysts formulated from the following four components will be studied to define the effects involved: (1) a transition metal active as a dehydrogenation catalyst (nickel and palladium will be tried as well as platinum); (2) a modifying post-transition metal (germanium and lead as well as tin); (3) an alkali-metal promotor (sodium, rubidium, and cesium as well as potassium), and (4) a neutral microporous support. Microcalorimetric studies are used to investigate the effects of catalyst modifiers on the interaction of probe molecules with these multicomponent catalysts. Infrared, Mossbauer, and nuclear magnetic resonance spectroscopic studies are conducted to illuminate the chemical states of the catalyst components, to determine their dispersions, and to probe the nature of adsorbates. Selective catalytic dehydrogenation of light paraffins is the key enabling process for the production of the oxygenates needed for the reformulation of gasoline as mandated by the Clean Air Act, and is also important for the production of light olefins such as ethylene and propylene. ***

摘要本研究是一项正在进行的研究的延伸，该研究表明，在钾交换沸石l中负载的铂和锡对异丁烷的脱氢具有高活性和高选择性，并且在反应条件下具有gmod稳定性。利用反应动力学研究、吸附微量热研究和光谱研究，对这一发现进行了检验，以阐明碱改性和支持性能的影响。将研究由以下四种成分组成的新催化剂，以确定所涉及的影响：(1)作为脱氢催化剂的活性过渡金属（镍和钯以及铂将被尝试）；(2)改性过渡后金属（锗、铅和锡）；(3)碱金属促进剂（钠、铷、铯和钾）和(4)中性微孔载体。用微量热法研究了催化剂改性剂对探针分子与这些多组分催化剂相互作用的影响。红外、穆斯堡尔和核磁共振光谱研究是为了阐明催化剂成分的化学状态，确定它们的分散，并探测吸附物的性质。轻石蜡的选择性催化脱氢是生产《清洁空气法》规定的汽油重新配方所需的氧合物的关键使能过程，对生产乙烯和丙烯等轻烯烃也很重要。＊＊＊