A series of nanoparticles (NPs) with different Au content was successfully encapsulated into metal organic framework ZIF-8 with highly porous structure through room-temperature crystallization. X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption and transmission electron microscopy were carried out to characterize the obtained Au@ZIF-8 heterogeneous catalytic material comprehensively. Au NPs were dispersed uniformly in the ZIF-8 and the Au NP diameter was 5-6 nm. The crystal structure of ZIF-8 was unchanged when compared with that before Au loading. It was found that the Au content plays an important role in the hydrogenation reaction. The obtained Au@ZIF-8 exhibited high hydrogenation activity to nitrophenol and excellent selectivity to aminophenol. The recyclability of the Au@ZIF-8 catalysts showed excellent catalytic performance and great stability in the recycling reaction.

中文翻译：

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用于硝基苯酚选择性加氢的稳定高效Au@ZIF-8的合成

一系列具有不同金含量的纳米颗粒（NPs）通过室温结晶成功地封装到具有高度多孔结构的金属有机骨架 ZIF-8 中。通过X射线衍射、傅里叶变换红外光谱、N2吸附和透射电子显微镜对所得Au@ZIF-8多相催化材料进行了综合表征。Au NPs 均匀分散在 ZIF-8 中，Au NP 直径为 5-6 nm。ZIF-8 的晶体结构与负载 Au 之前的晶体结构相比没有变化。发现Au含量在氢化反应中起重要作用。所得Au@ZIF-8对硝基苯酚具有较高的加氢活性，对氨基苯酚具有良好的选择性。