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Subnano-FeOx Clusters Anchored in an Ultrathin Amorphous Al2O3 Nanosheet for Styrene Epoxidation
ACS Catalysis ( IF 11.3 ) Pub Date : 2021-09-01 , DOI: 10.1021/acscatal.1c01366
Zhao Yang 1 , Shuo Zhang 2 , Hewei Zhao 1 , Anran Li 3 , Long Luo 4 , Lin Guo 1
Affiliation  

The development of low-cost, high-performance catalysts at the atomic level has drawn scientists’ attention due to the high atom efficiency, unique structure, and potentially high catalytic selectivity. Among the atomically tailored catalysts, nanoclusters are of particular interest because they represent an underexplored medium state between isolated single atoms and typical nanoparticles. In this study, we report a wet-chemistry approach to synthesize highly dispersed subnano-FeOx clusters anchored on an ultrathin amorphous Al2O3 nanosheet (or Al2O3–FeOx nanosheet) and its excellent catalytic performance for selective conversion of styrene to styrene oxide. The reasons for the high catalytic performance of the Al2O3–FeOx nanosheet are 2-fold. One is that the unsaturated and amorphous nature of the Fe atoms in the subnano-FeOx clusters promotes the adsorption of styrene onto the catalytic sites of FeOx clusters for epoxidation. The other is that the amorphous Al2O3 nanosheet prevents the aggregation of catalytic FeOx clusters during the epoxidation reaction because its defective structure immobilizes the FeOx clusters.

中文翻译:

亚纳米 FeOx 团簇锚定在超薄无定形 Al2O3 纳米片中,用于苯乙烯环氧化

由于原子效率高、结构独特和潜在的高催化选择性,在原子水平上开发低成本、高性能的催化剂引起了科学家的关注。在原子定制的催化剂中,纳米团簇特别令人感兴趣,因为它们代表了孤立的单个原子和典型的纳米粒子之间的未充分探索的介质状态。在这项研究中,我们报告了一种湿化学方法来合成高度分散的亚纳米 FeO x簇,锚定在超薄的非晶 Al 2 O 3纳米片(或 Al 2 O 3 –FeO x纳米片)及其对苯乙烯选择性转化为氧化苯乙烯的优异催化性能。Al 2 O 3 –FeO x纳米片具有高催化性能的原因有二倍。一是亚纳米-FeO x簇中Fe原子的不饱和和无定形性质促进了苯乙烯吸附到FeO x簇的催化位点上以进行环氧化。另一个是无定形Al 2 O 3纳米片在环氧化反应期间阻止催化FeO x簇的聚集,因为其缺陷结构固定了FeO x簇。
更新日期:2021-09-17
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