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首页> 外文期刊>RSC Advances >Heterojunctions generated in SnO2-CuO nanocatalysts for improved catalytic property in the Rochow reaction
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Heterojunctions generated in SnO2-CuO nanocatalysts for improved catalytic property in the Rochow reaction

机译：SnO2-CuO纳米催化剂中产生的异质结改善了Rochow反应的催化性能

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We report the improved catalytic performance of SnO2-CuO hybrid nanocatalysts synthesized by rationally designing and controlling the local heterojunction structure. The SnO2 nanoparticle (NP) decorated CuO nanorods (NRs) (SnO2-CuO) with a mace-like structure and with various CuO : SnO2 ratios were prepared via depositing pre-synthesized SnO2 NPs on CuO NRs in the presence of polyvinylpyrrolidone molecules. The CuO NRs were obtained by a facile hydrothermal reaction using Cu(NO3)(2)center dot 3H(2)O as the precursor. The samples were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and temperature-programmed reduction analyses. The results indicated that in the SnO2-CuO hybrid nanostructures, the heterojunctions were well generated as the SnO2 NPs were well dispersed on the CuO NRs. Their catalytic performances were then explored via the Rochow reaction, in which solid silicon (Si) reacts with gaseous methyl chloride (MeCl) to produce dimethyldichlorosilane (M2). Compared to separate CuO and SnO2 as well as their physical mixture, the SnO2-CuO hybrids exhibit significantly enhanced M2 selectivity and Si conversion because of the enhanced synergistic interaction between SnO2 and CuO due to the generated heterojunctions. This work demonstrates that the performance of heterogeneous catalysts can be improved by carefully designing and controlling their structures even when their composition remains unchanged.
机译：我们报告了通过合理设计和控制局部异质结结构合成的SnO2-CuO杂化纳米催化剂的改进的催化性能。通过在聚乙烯吡咯烷酮分子的存在下将预先合成的SnO2 NPs沉积在CuO NRs上，制备了具有钉头状结构且具有各种CuO：SnO2比的SnO2纳米颗粒（NP）装饰的CuO纳米棒（NRs）（SnO2-CuO）。 CuO NRs是通过使用Cu（NO3）（2）中心点3H（2）O作为前体的便捷水热反应获得的。通过X射线衍射，透射电子显微镜，扫描电子显微镜，X射线光电子能谱和程序升温还原分析对样品进行表征。结果表明，在SnO2-CuO杂化纳米结构中，由于SnO2 NPs很好地分散在CuO NRs上，异质结产生得很好。然后通过Rochow反应探索其催化性能，其中固体硅（Si）与气态氯甲烷（MeCl）反应生成二甲基二氯硅烷（M2）。与单独的CuO和SnO2以及它们的物理混合物相比，SnO2-CuO杂化物表现出显着增强的M2选择性和Si转化，因为由于产生的异质结，SnO2和CuO之间的协同作用增强。这项工作表明，即使精心设计和控制其结构，即使其组成保持不变，也可以提高多相催化剂的性能。

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