Boron Switch for Selectivity of Catalytic Dehydrogenation on Size-Selected Pt Clusters on Al2O3,Journal of the American Chemical Society

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Boron Switch for Selectivity of Catalytic Dehydrogenation on Size-Selected Pt Clusters on Al2O3
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-08-11 00:00:00 , DOI: 10.1021/jacs.7b05894
Mai-Anh Ha ₁ , Eric T. Baxter ₂ , Ashley C. Cass ₂ , Scott L. Anderson ₂ , Anastassia N. Alexandrova _{1,

3}

Affiliation

Size-selected supported clusters of transition metals can be remarkable and highly tunable catalysts. A particular example is Pt clusters deposited on alumina, which have been shown to dehydrogenate hydrocarbons in a size-specific manner. Pt₇, of the three sizes studied, is the most active and, therefore, like many other catalysts, deactivates by coking during reactions in hydrocarbon-rich environments. Using a combination of experiment and theory, we show that nanoalloying Pt₇ with boron modifies the alkene-binding affinity to reduce coking. From a fundamental perspective, the comparison of experimental and theoretical results shows the importance of considering not simply the most stable cluster isomer, but rather the ensemble of accessible structures as it changes in response to temperature and reagent coverage.

中文翻译：

硼开关对Al ₂ O ₃上按尺寸选择的Pt团簇的催化脱氢选择性

尺寸选择的负载型过渡金属簇可能是引人注目的且高度可调的催化剂。一个具体的例子是沉积在氧化铝上的Pt团簇，它已经显示出以特定尺寸的方式使烃脱氢。所研究的三种尺寸的Pt ₇是活性最高的，因此，与许多其他催化剂一样，Pt ₇在富含烃类的环境中的反应过程中会因焦化而失活。结合实验和理论，我们证明了纳米合金Pt ₇用硼修饰烯烃结合亲和力以减少焦化。从基本的角度看，对实验结果和理论结果的比较表明，不仅要考虑最稳定的团簇异构体，而且还要考虑可访问结构的集合，因为它随温度和试剂覆盖率的变化而变化，这一点很重要。

更新日期：2017-08-12

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