Spectroscopic Studies of Partial Oxidation Catalysts During Their Genesis & Use

制备方案对物理和化学性质的影响 二元和三元混合金属氧化物的化学性质 研究了催化剂。 本体和负载型催化剂 使用激光拉曼光谱研究系统， 穆斯堡尔谱（铁-57和锑-121）以及 其他仪器方法。 制备变量包括pH值 沉淀，催化剂前体的比例， 沉淀和干燥的长度和温度， 煅烧 监测的影响包括以下阶段： 催化剂的组成，催化剂的氧化态， 组成金属和催化性能（活性和 选择性）。 后者将 通过使用催化剂来影响部分 在流动反应器中将丙烯氧化成丙烯醛。 混合金属氧化物在许多化学反应中用作催化剂。 流程.他们很有吸引力，因为他们的高 对特定产品的选择性，包括许多高- 增值产品。 然而，影响因素 选择性知之甚少，现存的工艺具有 是根据经验发展起来的。 本研究旨在 阐明这些因素。

The effects of the preparation protocol on the physical and chemical properties of binary and ternary mixed-metal-oxide catalysts are investigated. Both bulk and supported catalyst systems are studied using laser Raman spectroscopy and Mossbauer spectroscopy (iron-57 and antimony-121) as well as other instrumental methods. Preparation variables include pH of precipitation, ratio of catalyst precursors, order of precipitation and lengths and temperatures of drying and calcination. Effects to be monitored include the phase composition of the catalysts, the oxidation states of the constituent metals, and the catalytic properties (activity and selectivity) of the solid catalysts. The latter will be represented by using the catalyst to affect the partial oxidation of propylene to acrolein in a flow reactor. Mixed metal oxides are used as catalysts in many chemical processes. They are attractive because of their high selectivities toward particular products, including many high- value-added products. However, the factors influencing selectivity are poorly understood, the extant processes having been developed empirically. This study is intended to elucidate these factors.