Compound Precursors to Mixed Metal Oxides

混合金属氧化物的化合物前体

• 批准号: 8915897
• 负责人: Kenneth Poeppelmeier
• 金额: $ 30.51万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-15 至 1994-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8915897&HistoricalAwards=false
• 关键词: Compound; Precursors; Mixed; Metal; Oxides

Reactions of one solid with another that occur at room temperature are not common in solid state chemistry. The reaction of metal hydroxides with salts is a particularly unusual example. This reaction they have called salt imbibition and it provides a new synthetic method for the preparation of high surface area (HSA) mixed metal oxides. Such compound precursors can be decomposed to give mixed oxides. Because all reactions can be carried out at low temperature, the products will not sinter and will retain their porous character and relatively high surface area. Compared to commercially available HSA oxides (e.g. aluminas, silicas and zeolites) mixed metal oxides offer an entirely new range of materials for applications in ceramics, catalysis and emerging materials science applications. Because HSA mixed oxides have not been widely available their surface chemistry is unknown. Ion-exchange, a diffusion dependent reaction, occurs not only near the surace but can be an important reaction in the interior of a mixed metal oxide crystallite. A related intrinsic characteristic of a HSA oxide is its solid-acid chemistry. To distinguish the type of surface chemistry that can be expected from these novel materials well known reactions such as the isomerization of 3,3-dimethylbutene to 2,3- dimethylbutenes, 2- and 3-methylpentenes, and n-hexenes will be investigated.

一种固体与室温下发生的一种固体的反应在固态化学中并不常见。 金属氢氧化物与盐的反应是一个特别不寻常的例子。 他们称这种反应称为盐吸收，并为制备高表面积（HSA）混合金属氧化物提供了一种新的合成方法。 这种化合物前体可以分解以产生混合氧化物。 由于所有反应都可以在低温下进行，因此产品不会烧结，并且会保留其多孔特性和相对较高的表面积。 与市售的HSA氧化物（例如铝，硅和沸石）混合金属氧化物相比，为陶瓷，催化和新兴材料科学应用提供了全新的材料。 由于HSA混合氧化物尚未广泛使用，其表面化学尚不清楚。 离子交换是一种扩散依赖反应，不仅发生在Surace附近，而且可能是混合金属氧化物晶体内部的重要反应。 HSA氧化物的相关内在特征是其固体化学。 为了区分这些新型材料可以预期的表面化学类型，例如将3,3-二甲基丁烯异构化为2,3-二甲基布丁，2-二甲基苯甲酸酯，2-甲基苯乙烯和N-己烯。