Spectroscopic Studies of Partial Oxidation Catalysts During Their Genesis & Use

研究了制备工艺对二元和三元混合金属氧化物催化剂理化性能的影响。使用激光拉曼光谱和穆斯堡尔光谱（铁-57和锑-121）以及其他仪器方法研究了体和负载型催化剂体系。制备变量包括沉淀的pH值，催化剂前驱体的比例，沉淀的顺序以及干燥和煅烧的长度和温度。需要监测的影响包括催化剂的相组成、组成金属的氧化态以及固体催化剂的催化性能（活性和选择性）。后者将通过在流动反应器中使用催化剂来影响丙烯部分氧化为丙烯醛来表示。混合金属氧化物在许多化学过程中用作催化剂。它们之所以具有吸引力，是因为它们对特定产品具有高度选择性，其中包括许多高附加值产品。然而，影响选择性的因素了解甚少，现有的过程已开发经验。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.