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Catalysis at the sub-nanoscale: complex CO oxidation chemistry on a few Au atoms

机译:亚纳米级的催化:几个AU原子上的复杂CO氧化化学

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摘要

Au has been widely used as jewelry since ancient times due to its bulk, chemically inert properties. During the last three decades, nanoscale Au has attracted remarkable attention and has been shown to be an exceptional catalyst, especially for oxidation reactions. Herein, we elucidate a puzzle in catalysis by using multiscale computational modeling: the experimentally observed "magic number" CO oxidation catalytic behavior of sub-nanoscale Au clusters. Our results demonstrate that support effects (cluster charging), symmetry-induced electronic effects on the clusters, catalyst reconstruction, competing chemical pathways and formation of carbonate contribute to the marked differences in the observed catalytic behavior of Au-n(-) clusters with n = 6, 8 and 10 atoms. This is the first demonstration of multiscale simulations on sub-nanoscale catalysts unraveling the magic number activity for the CO oxidation reaction on Au.
机译:自远古时代以来,AU由于其散装,化学惰性的特性而被广泛用作珠宝。 在过去的三十年中,Nanoscale au引起了引人注目的关注,并已被证明是一种特殊的催化剂,尤其是对于氧化反应。 在本文中,我们使用多尺度计算建模阐明了催化中的难题:实验观察到的“魔术数” CO氧化催化行为Au au簇。 我们的结果表明,支撑效应(集群充电),对称诱导的电子效应对簇,催化剂重建,竞争化学途径和碳酸盐的形成有助于Au-N( - )簇观察到的催化行为的明显差异 = 6、8和10原子。 这是在亚纳米级催化剂上的多尺度模拟的首次演示,该催化剂揭示了AU上的CO氧化反应的魔法数量活性。

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