Electron Magnetic Resonance Studies of Transition Metal Ions on Oxide Surfaces

在9和35 GHz的电子磁共振方法将被用来调查在微孔分子筛氧化物表面的催化重要性的过渡金属离子的结构特征纳入本研究项目的分析和表面化学程序的支持。 重点将是确定过渡金属离子在铝磷酸盐（AlPO 4）和硅铝磷酸盐（SAPO）材料中的骨架或非骨架位置。 自旋回波调制光谱法将提供有关吸附物的数量，几何形状和取向的信息。 这种结构信息将与顺磁性离子对探针反应如烯烃二聚和丙烯氧化的催化效率有关。 将研究Ni（I）、Pd（I）和Rh（II）物种在AlPO4和SAPO材料中的行为。 为了理解高比表面积微孔氧化物材料的多相催化机理，必须获得关于这些材料中活性过渡金属离子的结构信息。 本研究项目将利用电子顺磁共振方法获得这种结构信息，并将其与催化剂材料对各种探针反应的催化活性联系起来。 了解催化活性的机理对于催化过程的合理设计和实施至关重要，而催化过程是现代化学工业的基础。

Electron magnetic resonance methods at 9 and 35 GHz will be used to investigate the structural features of transition metal ions of catalytic importance incorporated in microporous molecular sieve oxide surfaces in this research project supported by the Analytical and Surface Chemistry Program. The emphasis will be on determining the location of transition metal ions in framework or non-framework sites in aluminophosphate (AlPO4) and silicoaluminophosphate (SAPO) materials. Spin echo modulation spectrometry methods will provide information about adsorbate number, geometry, and orientation. This structural information will be related to the catalytic efficiency of the paramagnetic ion for probe reactions such as olefin dimerization and propylene oxidation. The behavior of Ni(I), Pd(I), and Rh(II) species in AlPO4 and SAPO materials will be investigated. In order to understand the mechanisms of heterogeneous catalysis by high surface area microporous oxide materials, structural information about the active transition metal ion incorporated into these materials must be obtained. This research project will utilize electron paramagnetic resonance methods to obtain this structural information and relate it to the catalytic activity of catalyst materials for various probe reactions. The understanding of the mechanisms of catalytic activity is crucial to the rational design and implementation of catalytic processes which underlie much of modern chemical industry.