Supported Au nanoparticles (NPs) have attracted much attention in catalytic field because of their high activity and selectivity. However, its activity was affected by its dispersion. In this work, a controlled impregnation method was used to prepare Au/Zn-hydrotalcites (Au/Zn-HTs). The role of lattice Zn2+ in controlling Au NPs was studied. The size, structure, and composition of Au NPs were characterized using techniques of nitrogen physisorption, X-ray diffraction, scanning transmission electron microscopy, temperature-programmed reduction, and X-ray photoelectron spectroscopy. The mean size of Au/Zn-HTs by this work was 1.8 nm, which was smaller than the mean size of catalysts by traditional method. The mechanism of forming Au NPs was investigated. There was electron transfer between Au and Zn2+, displaying the interaction between them. It was found that dispersion of Zn2+ and the interaction between Au and Zn were two key factors affecting the dispersion of Au NPs. The dispersion of Zn2+ could be controlled by adjusting its content in HTs. The yield of acetophenone was 92% by Au/Zn-HTs, while it was below 65% for catalysts prepared by traditional method.

中文翻译：

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由载体的晶格 Zn2+ 控制的 Au 纳米粒子

负载型金纳米粒子（NPs）因其高活性和选择性而在催化领域引起了广泛关注。然而，其活性受到其分散的影响。在这项工作中，使用受控浸渍方法制备 Au/Zn-水滑石 (Au/Zn-HTs)。研究了晶格 Zn2+ 在控制 Au NPs 中的作用。使用氮物理吸附、X 射线衍射、扫描透射电子显微镜、程序升温还原和 X 射线光电子能谱技术表征 Au NPs 的大小、结构和组成。这项工作的 Au/Zn-HTs 的平均尺寸为 1.8 nm，这小于传统方法催化剂的平均尺寸。研究了Au NPs的形成机制。Au和Zn2+之间存在电子转移，显示了它们之间的相互作用。结果表明，Zn2+的分散和Au与Zn之间的相互作用是影响Au NPs分散的两个关键因素。Zn2+ 的分散可以通过调节其在HTs 中的含量来控制。Au/Zn-HTs的苯乙酮产率为92%，而传统方法制备的催化剂产率低于65%。