壳聚糖修饰的NiB非晶态合金的制备及表征

摘要

以壳聚糖(CS)为稳定剂,采用化学还原法制备了非负载型NiB非晶态合金催化剂(NiB-CS);并用X射线衍射(XRD)、电感耦合等离子体发射光谱(ICP)、X射线光电子能谱(XPS)、透射电镜(TEM)、选区电子衍射(SAED)等表征方法研究了催化剂的非晶性质、原子组成及粒径大小等.考察了催化剂对糠醇加氢制四氢糠醇反应的催化性能,并与没有壳聚糖保护的NiB催化剂进行了对比.结果表明,加入壳聚糖制得的NiB-CS催化剂的活性组分NiB粒径更小,表面活性组分浓度更高,催化活性更高.%NiB amorphous alloy catalyst (NiB-CS) was prepared by direct reduction using the chemical-reduction method with chitosan as a stabilizer. The amorphous structure, atomic composition, and particle size of the as-prepared catalysts were characterized by X-ray diffraction (XRD), inductively coupled plasma spectrometry (ICP), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). The catalytic behavior during the hydrogenation of furfuryl alcohol (FA) to tetrafurfural alcohol (THFA) was studied and compared with the NiB catalyst prepared without chitosan. The amorphous NiB-CS catalyst was found to be more reactive than the NiB catalyst. The superior catalytic activity of the NiB-CS catalyst is attributed to the small NiB particles and the high surface content of Ni active species.