Compound Precursors to Mixed Metal Oxides

在固体化学中，一种固体与另一种固体在室温下发生的反应并不常见。金属氢氧化物与盐的反应是一个特别不寻常的例子。这种反应被称为盐吸附，为制备高比表面积(HSA)混合金属氧化物提供了一种新的合成方法。这种化合物前驱体可以分解得到混合氧化物。由于所有反应都可以在低温下进行，因此产品不会烧结，并将保持其多孔特性和相对较高的比表面积。与商业上可用的HSA氧化物(如氧化铝、二氧化硅和沸石)相比，混合金属氧化物为陶瓷、催化和新兴材料科学应用提供了一系列全新的材料。由于人血清白蛋白混合氧化物尚未得到广泛应用，其表面化学尚不清楚。离子交换是一种扩散相关的反应，不仅发生在表面附近，而且可能是混合金属氧化物微晶内部的一个重要反应。人血清白蛋白氧化物的一个相关的内在特征是它的固酸化学。为了区分这些新材料可预期的表面化学类型，将研究众所周知的反应，如3，3-二甲基丁烯异构化为2，3-二甲基丁烯、2-和3-甲基戊烯以及正己烯。

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.