GOALI: STM and AXAFS Studies of Electronic Effects due to Metal Support Interaction on Noble Metal Supported Catalysts

GOALI：贵金属负载催化剂上金属载体相互作用引起的电子效应的 STM 和 AXAFS 研究

• 批准号: 9904033
• 负责人: Eduardo Wolf
• 金额: $ 9万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9904033&HistoricalAwards=false
• 关键词: GOALI; STM; AXAFS; Studies; Electronic

This is a GOALI university-industry collabortive project. Prof. Wolf and Dr. Miller will measure the electronic properties of noble metal catalysts on various supports and verify whether changes in those properties are correlated with the observed changes by orders of magnitude in turnover frequency and selectivity. The model catalysts will consist of Pt and Pd deposited on thin films of metal oxide supports (alumina, silica, titania, and K-doped alumina, deposited or grown on Mo (110)). They will be compared with standard high surface are catalysts. The electronic structure of surfaces of surfaces will be probed with scanning tunneling spectroscopy (STS); its morphology with scanning microscopy (STM); and its reactivity with the kinetics of hydrogenolysis of neopentane and oxidation of methane. Metal particles will be synthesized with different sizes. STM will be used to ascertain the particle size distribution and STS will yield the electronics characteristics via I-V curves on the bare support and the particle-coated catalyst. Diffuse reflectance infrared spectroscopy (DRIFTS) of adsorbed CO will yield structural and electronic property information. The near neighbor structure of metals and support will be determined with EXAFS. The interatomic potential of Pt will be determined with atomic absorption x-ray spectroscopy (AXAFS) and correlated with catalysis and DRIFTS results. Acidity determinations will involve ammonia chemisorption. The STM work will be carried out at Notre Dame, while the EXAFS work by BP Amoco will require resources of the Argonne National Laboratory.

这是一个守门大学 - 工业合作项目。 沃尔夫教授和米勒博士将在各种支持上测量贵金属催化剂的电子特性，并验证这些特性的变化是否与观察到的变化相关的变化是在周转频率和选择性中的数量级。 该模型催化剂将由沉积在金属氧化物支撑薄膜（氧化铝，二氧化硅，二氧化钛和K掺杂氧化铝的薄膜上）组成，沉积或生长在MO（110）上）。 它们将与标准高表面的催化剂进行比较。 扫描隧道光谱法（STS）将探测表面表面的电子结构；其形态使用扫描显微镜（STM）；及其与新戊烷氢解的动力学和甲烷氧化的反应性。 金属颗粒将与不同大小合成。 STM将用于确定粒径分布，而STS将通过I-V曲线在裸露的支撑和颗粒涂层的催化剂上产生电子特性。吸附CO的扩散反射红外光谱（漂移）将产生结构和电子特性信息。 金属的近邻域结构和支撑将通过EXAF确定。 PT的原子间电位将通过原子吸收X射线光谱（AXAF）确定，并与催化和漂移结果相关。 酸度确定将涉及氨化学吸附。 STM工作将在巴黎圣母院进行，而BP Amoco的EXAFS工作将需要Argonne National Laboratory的资源。