Data for: Preparation of Ni, CoO-supported halloysite nanotubes catalyst and its application in hydrogenation of furfural to furfuryl alcohol

In this study, the halloysite (Hal) nanotubes were designed as carrier and stabilizer to act a nanostructured matrix and a series of Ni, CoO-Hal catalysts have been synthesized through a deposition method. The prepared catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR) spectroscopy, Scanning electron microscopy (SEM), and Transmission electron micrograph (TEM). The catalytic properties of prepared catalyst were evaluated using the hydrogenation of furfural to furfuryl alcohol. The average pore size of activated Hal ranged from 20 nm to 32 nm, and the specific surface areas of Hal increased up to 125.55 m2/g. The Ni or CoO particles were successfully loaded on the external surface of Hal nanotubes with the diameters approximately at 10 nm. The XPS data confirm zero-valent character for metal Ni at 852.6 eV and the oxide form for metal Co with type of CoO and Co3O4, meanwhile, a small amount of nickel protoxide due to the weak oxidation on the surface of metal Ni was observed. The evaluation of catalytic activities showed that the Ni-Hal catalyst presented favorable selectivity to furfural alcohol (approximately at 99.0 %) and well furfural conversion. The successive catalytic cycles indicated that the furfural conversion and selectivity to furfural alcohol of the prepared catalyst maintained whole stability (approximately at 96 % and 65 %, respectively).

本研究以埃洛石（halloysite, Hal）纳米管作为载体与稳定剂，充当纳米结构基质，并通过沉积法合成了一系列镍（Ni）、氧化钴（CoO）负载型埃洛石催化剂。所制备的催化剂采用X射线衍射（X-ray diffraction, XRD）、X射线光电子能谱（X-ray photoelectron spectroscopy, XPS）、傅里叶变换红外（Fourier-transform infrared, FT-IR）光谱、扫描电子显微镜（Scanning electron microscopy, SEM）以及透射电子显微成像（Transmission electron micrograph, TEM）进行表征。以糠醛（furfural）加氢制备糠醇（furfuryl alcohol）的反应为探针，评估了所制备催化剂的催化性能。

活化后的埃洛石平均孔径介于20 nm至32 nm之间，其比表面积最高可达125.55 m²/g。镍或氧化钴颗粒成功负载于埃洛石纳米管的外表面，颗粒直径约为10 nm。XPS测试结果证实，位于852.6 eV处的金属镍为零价态，金属钴则以氧化钴（CoO）和四氧化三钴（Co₃O₄）两种氧化物形式存在；同时，由于金属镍表面发生微弱氧化，还检测到少量一氧化镍（nickel protoxide）。

催化活性评价结果表明，Ni-Hal催化剂对糠醇表现出优异的选择性（约99.0%），且糠醛转化率良好。连续催化循环实验结果显示，所制备催化剂的糠醛转化率及对糠醇的选择性均保持了良好的整体稳定性，二者分别约为96%和65%。