Unit Synthesis Approach for Creating High Dimensionally Structured Complex Metal Oxides as Catalysts for Selective Oxidations,ACS Catalysis

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Unit Synthesis Approach for Creating High Dimensionally Structured Complex Metal Oxides as Catalysts for Selective Oxidations
ACS Catalysis ( IF 11.3 ) Pub Date : 2018-02-23 00:00:00 , DOI: 10.1021/acscatal.7b02244
Satoshi Ishikawa ₁ , Zhenxin Zhang ₁ , Wataru Ueda ₁

Affiliation

Solid-state catalysts for selective oxidations have been prepared by simple traditional protocols including impregnation, precipitation, solid-state reaction, and so on. Although these catalyst preparation protocols are convenient to form new or improved catalysts, a huge number of practical experiments have been inevitably necessary. This situation will be even more difficult because solid-state catalysts become increasingly complex in order to introduce multifunction. It is time that catalyst researchers should devote their efforts to establish new synthetic methodology to improve the situation and ultimately create new catalysts. Here, we propose a new catalyst synthesis approach, that is, unit synthesis, to produce high dimensionally structured crystalline complex metal oxide catalysts. By applying this synthesis methodology, we have been able to synthesize several new crystalline complex metal oxides active for catalytic selective oxidations. In this Perspective, crystalline Mo₃VO_x oxides and crystalline porous material based on ε-Keggin polyoxometalates (POM) are introduced as successful examples of the unit synthesis. We found that the former shows extremely high catalytic activity for ethane oxidation to ethane and acrolein oxidation to acrylic acid with molecular oxygen and the latter for methacrolein oxidation to methacrylic acid.

中文翻译：

生成高维结构复杂金属氧化物作为选择性氧化催化剂的单元合成方法

通过简单的传统方法，包括浸渍，沉淀，固态反应等，已经制备了用于选择性氧化的固态催化剂。尽管这些催化剂制备方案便于形成新的或改进的催化剂，但是不可避免地需要大量的实际实验。由于固态催化剂为了引入多功能而变得越来越复杂，因此这种情况将更加困难。现在该是催化剂研究人员应该致力于建立新的合成方法以改善这种状况并最终创建新催化剂的时候了。在这里，我们提出了一种新的催化剂合成方法，即单元合成，以生产高尺寸结构的晶体复合金属氧化物催化剂。通过应用这种综合方法，我们已经能够合成出几种对催化选择性氧化具有活性的新型晶体复合金属氧化物。从这个角度来看，结晶钼_{介绍了3种}VO _x氧化物和基于ε-Keggin多金属氧酸盐（POM）的晶体多孔材料，作为单元合成的成功实例。我们发现，前者对乙烷氧化为乙烷，丙烯醛与分子氧氧化为丙烯酸显示出极高的催化活性，而后者对甲基丙烯醛氧化为甲基丙烯酸的显示为极高的催化活性。

更新日期：2018-02-23

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