壳聚糖表面修饰的SiO2负载Ni-B非晶态合金的制备及催化性能

以壳聚糖(CS)对SiO2进行表面修饰, 采用浸渍还原法制备了负载型Ni-B非晶态合金催化剂(Ni-B/CS/SiO2), 并采用XRD、FTIR、电感耦合等离子体发射光谱(ICP)、BET、XPS、TEM、SAED等表征方法研究了催化剂的非晶性质、原子组成、尺寸分布及粒径大小等. 考察了催化剂对糠醇加氢制四氢糠醇反应的催化性能, 并与没有壳聚糖修饰的Ni-B/SiO2催化剂及Raney Ni催化剂进行了对比. 结果表明, 加入壳聚糖制得的Ni-B/CS/SiO2催化剂的活性组分Ni-B团簇粒径更小, 表面活性组分浓度更高, 催化活性更高.

Preparation and Catalytic Performance of Ni-B Amorphous Alloy Supported by Chitosan/SiO2

Ni-B amorphous catalyst supported by chitosan(CS)-modified silica(Ni-B/CS/SiO_2)was prepared using the impregnation-reduction method.The as-prepared catalysts were characterized using X-ray powder diffraction(XRD), fourier transform infrared(FTIR)spectra,inductively coupled plasma(ICP)spectrometer,Brunauter-Emmett-Teller (BET)method,X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),and selected area electron diffraction(SAED).The results showed that the particle sizes,the surface content of Ni active species,and catalytic activity were improved by introducing chitosan to the surface of silica.In the hydrogenation of furfuryl alcohol(FA)to tetrafurfural alcohol(THFA),the amorphous Ni-B/CS/SiO_2 catalyst exhibited superior catalytic activity to the corresponding traditional Ni-B/SiO_2 amorphous catalyst and Raney Ni.