Preparation method of supported Ni2P catalyst

Abstract

The invention discloses a preparation method of supported Ni2P catalyst. The preparation method of the supported Ni2P catalyst comprises the following steps: preparing a silicon dioxide, MCM-41, SBA-15, aluminium oxide, titanium oxide, HY molecular sieve or HZSM-5 molecular sieve supported nickel oxide precursor by adopting an impregnation way; reducing the supported nickel oxide precursor into a supported Ni precursor in a fixed bed reactor, then introducing hydrogen, introducing a triphenylphosphine or tri-n-octylphosphine solution into the fixed bed reactor at a certain temperature, and phosphating for a period of time at constant temperature, thus obtaining the supported Ni2P catalyst in situ. Compared with a general method for preparing the supported Ni2P catalyst by adopting a supported nickel phosphate temperature programmed reduction method, the preparation method of the supported Ni2P catalyst is simple and practicable, generation of aluminium phosphate owning to reaction between phosphorus species and aluminium oxide in a carrier can be avoided, and the phosphorus species can be effectively utilized.

Description

technical field [0001] The invention relates to a loaded Ni 2 The invention discloses a method for preparing a P catalyst, belonging to the technical field of catalysis. Background technique [0002] Since the 1990s, many studies have shown that transition metal phosphides exhibit unique catalytic performance in hydrodesulfurization, hydrodenitrogenation, hydrodechlorination, hydrodeoxygenation and some hydrogenation reactions (Journal of Catalysis, 2003, 216: 343; Catalysis Letters, 2012, 142: 1413; Applied Catalysis B: Environmental, 2014, 144: 870), which have attracted more and more attention from scholars and industries at home and abroad in recent years. Among the reported Ni, Co, Fe, Mo and W phosphide catalysts, Ni 2 P catalyst has better catalytic performance. [0003] Ni 2 There are many ways to prepare P catalyst, including phosphate temperature-programmed reduction method, phosphine reduction method, phosphite and hypophosphite reduction method, phosphorus so...

AI Technical Summary

Problems solved by technology

Therefore, the process is cumbersome and extremely inconvenient in practical application.

Although the reduction method can be used at a lower temperature (300~550 oC ) to prepare loaded Ni 2 P, but at the same time an impurity phase will be generated and more phosphate remains in the catalyst; when using Al 2 o 3 and silicon-aluminum molecular sieves and other aluminum-containing carriers, hypophosphite and phosphite will react with the carrier to form AlPO 4 , for the preparation of Ni 2 P needs to load more phosphorus species to affect catalyst performance

In addition, with trioctylphosphine or triphenylphosphine as phosphorus source, at 250~370 o C Phosphate metal Ni nanoparticles into monodisperse Ni by liquid phase method 2 P particles, and then loaded onto the carrier by impregnation method; although this method can prepare loaded Ni 2 P, the process is cumbersome, and Ni 2 The interaction between P and the carrier is weak, and it is easy to agglomerate during use