Scale-Up of Cluster Beam Deposition to the Gram Scale with the Matrix Assembly Cluster Source for Heterogeneous Catalysis (Catalytic Ozonation of Nitrophenol in Aqueous Solution)
Scale-Up of Cluster Beam Deposition to the Gram Scale with the Matrix Assembly Cluster Source for Heterogeneous Catalysis (Catalytic Ozonation of Nitrophenol in Aqueous Solution)
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DOI：
10.1021/acsami.0c05955
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发表时间：
2020-06-03
影响因子：
9.5
通讯作者：
Palmer, Richard E.
中科院分区：
文献类型：
--
作者：
Cai, Rongsheng;Martelli, Francesca;Palmer, Richard E.
精确控制的簇从束到合适的载体上的沉积代表了制备先进的簇基催化剂的新方法。原则上，可以在沉积之前调整或选择簇的尺寸、组成和形态。新发明的矩阵组装团簇源（MACS）为长期存在的团簇沉积速率低的问题提供了一种解决方案。现在需要在实际反应条件下演示团簇的活动。我们沉积元素银（Ag）和金（Au）簇到克级粉末的商业二氧化钛（TiO 2）的研究硝基苯酚（水中的代表性污染物）的催化氧化在水溶液中的臭氧，相关的从供水中去除废药物。一系列的技术，包括扫描透射电子显微镜（STEM），Brunauer-Emmett-Teller（BET）表面积测试，和X射线光电子能谱（XPS），揭示了催化剂的大小，形态，表面积，和氧化态。Ag和Au团簇催化剂对硝基苯酚的臭氧化反应都有较好的催化活性。簇催化剂的活性至少与文献中传统化学方法制备的催化剂相当，表明簇束沉积法在溶液中实际多相催化中的潜在应用。
The deposition of precisely controlled clusters from the beam onto suitable supports represents a novel method to prepare advanced cluster-based catalysts. In principle, cluster size, composition, and morphology can be tuned or selected prior to deposition. The newly invented matrix assembly cluster source (MACS) offers one solution to the long-standing problem of low cluster deposition rate. Demonstrations of the cluster activities under realistic reaction conditions are now needed. We deposited elemental silver (Ag) and gold (Au) clusters onto gram-scale powders of commercial titanium dioxide (TiO2) to investigate the catalytic oxidation of nitrophenol (a representative pollutant in water) by ozone in aqueous solution, as relevant to the removal of waste drugs from the water supply. A range of techniques, including scanning transmission electron microscopy (STEM), Brunauer-Emmett-Teller (BET) surface area test, and X-ray photoelectron spectroscopy (XPS), were employed to reveal the catalyst size, morphology, surface area, and oxidation state. Both the Ag and Au cluster catalysts proved active for the nitrophenol ozonation. The cluster catalysts showed activities at least comparable to those of catalysts made by traditional chemical methods in the literature, demonstrating the potential applications of the cluster beam deposition method for practical heterogeneous catalysis in solution.