Ni2P/Fe-HAP催化剂的表征及其苯酚加氢表面作用机理

以低品级羟基磷灰石(HAP)为原料,通过离子交换法合成载体Fe-HAP,然后用浸渍法制备出负载型Ni_2P/HAP和Ni_2P/Fe-HAP催化剂。通过BET、SEM、XRD、FTIR和TG等手段对催化剂进行了表征。Fe~(3+)的引入极大地提高了载体的比表面积,Ni_2P分散在Fe-HAP表面,热稳定性较好。以苯酚加氢制备环己酮为反应体系,在反应温度为150℃、压力为0.5 MPa、时间为3.5 h的条件下,对比了Ni_2P/HAP和Ni_2P/Fe-HAP催化剂的催化性能。结果发现,Ni_2P/Fe-HAP催化剂对苯酚的转化率为65.73%,环己酮选择性为85.47%,催化性能相对良好。

Characterization of Ni2P/Fe-HAP Catalyst and Its Surface Interaction Mechanism in Phenol Hydrogenation

The carrier Fe-HAP was synthesized by ion exchange method using commercially available low-grade HAP as raw material, and then supported Ni2P/HAP and Ni2P/Fe-HAP catalysts were prepared by impregnation method. The catalyst was characterized by N2 adsorption-desorption, scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetry (TG). Doping Fe3+ greatly increases the specific surface area of the carrier, Ni2P dispersed on the surface of Fe-HAP and good thermal stability. The reaction system was prepared by hydrogenation of phenol to cyclohexanone. The catalytic performance of Ni2P/HAP and Ni2P/Fe-HAP catalysts was compared using cyclohexanone prepared from phenol hydrogenation as the reaction system at a reaction temperature of 150 ° C, a pressure of 0.5 MPa, and a time of 3.5 h. It was found that the Ni2P/Fe-HAP catalyst showed good catalytic activity and cyclohexanone selectivity.