Partial Oxidation of Methane to Methanol and Formaldehyde over Molybdenum-Oxide-Based-Catalysts

构造与地表的关系 基于氧化钼的催化剂的特性和 这些催化剂在部分氧化中的选择性 研究了甲烷。 讨论的问题包括： 活性中心的性质，促进剂的作用，催化剂- 支持相互作用，晶格氧的作用，以及 气相氧化剂的参与。支持， 制备无载体的和促进的催化剂， 使用激光拉曼光谱、X射线 衍射，扫描电子显微镜与三- 三维成像，能量色散X射线分析，X射线 光电子能谱，稳态动力学，和 瞬态响应实验 晶格氧的作用 氧化反应用原位激光拉曼检测 光谱与同位素标记结合。 甲烷可以从天然气或炼油厂中很容易地获得 污水 其直接部分氧化为甲醇或 甲醛将为这两种资本提供重大节省 和运营成本相比， 产品. 钼氧化物催化剂显示了这方面的前景 转换，但需要进一步研究，以获得一个实用的 过程

The relationship between the structural and surface characteristics of catalysts based on molybdenum oxide and the selectivity of these catalysts in the partial oxidation of methane is investigated. Among the issues addressed are the nature of active sites, the effects of promoters, catalyst- support interactions, the role of lattice oxygen, and the participation of the gas-phase oxidant. Supported, unsupported, and promoted catalysts are prepared and characterized using laser Raman spectroscopy, X-ray diffraction, scanning electron microscopy with three- dimensional imaging, energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, steady-state kinetics, and transient response experiments. The role of lattice oxygen in the oxidation reaction is examined using in situ laser Raman spectroscopy in conjunction with isotopic labelling. Methane is readily available from natural gas or refinery effluents. Its direct partial oxidation to methanol or formaldehyde would offer major savings in both capital and operating costs over traditional methods of making these products. Molybdenum-oxide catalysts show promise for this conversion, but further study is needed to obtain a practical process.