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首页> 外文期刊>Catalysis science & technology >Hydroxyl groups attached to Co2+ on the surface of Co3O4: a promising structure for propane catalytic oxidation
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Hydroxyl groups attached to Co2+ on the surface of Co3O4: a promising structure for propane catalytic oxidation

机译：表面的羟基与Co2 +对丙烷Co3O4:一个有前途的结构催化氧化

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摘要

Co3O4 catalysts with three specific morphologies (nanocubes, nanosheets, and nanooctahedra) were prepared using simple preparation methods and tested for catalytic combustion of propane under the same reaction conditions. Co3O4 nanosheets (Co3O4-S) with the highest Co2+ content presented the best catalytic activity among the three catalysts and achieved complete oxidation of propane at 210 degrees C compared with 320 degrees C for nanocubes and 400 degrees C for nanooctahedra in our work. It is confirmed by XPS characterization that there were a large number of surface hydroxyl groups on the surface of Co3O4-S, and they were more inclined to attach to Co2+ species, whereas the amount of hydroxyl groups on the surface of the other two catalysts (nanocubes and nanooctahedra) was negligible. DFT calculations indicate that the bond energy between a hydroxyl group and surface Co2+ is higher than that between a hydroxyl group and surface Co3+, which proves that hydroxyl groups are more likely to be attached to Co2+ on the surface of Co3O4-S. The hydroxyl groups on the surface of Co3O4-S altered the intermediates and the reaction pathway in the process of propane oxidation, which greatly enhanced the catalytic activity of Co3O4-S. This research can open up a facile and reliable strategy for the design and construction of efficient propane oxidation catalysts by modifying the functional groups on the surface of the catalysts.
机译：Co3O4催化剂有三个具体的形态(nanocubes nanosheets和nanooctahedra)使用简单的制备方法和准备测试下的丙烷催化燃烧相同的反应条件。(Co3O4-S) +二氧化碳含量最高三个中最好的催化活性催化剂,取得完整的氧化丙烷与320年相比,在210摄氏度度nanocubes和400摄氏度nanooctahedra在我们的工作。有大量描述表面羟基的表面Co3O4-S,他们更倾向于依附二氧化碳+物种,而羟基的数量组织表面的其他两个催化剂(nanocubes和nanooctahedra)是微不足道的。计算表明,键能羟基和表面Co2 +高于羟基之间表面二氧化碳+,这证明了羟基更有可能被附加到二氧化碳+上Co3O4-S表面。表面Co3O4-S中间体和改变反应途径的过程中丙烷极大地促进了催化氧化Co3O4-S的活动。简单和可靠的设计和策略建设高效的丙烷氧化催化剂通过修改官能团催化剂的表面。

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