Preparation method of high-dispersing supported metal nano catalyst

The invention relates to a preparation method of a high-dispersing supported metal nano catalyst and belongs to the technical field of catalyst. The invention provides the preparation method of the supported metal nano catalyst, which includes the steps of: 1) through an excessive impregnation method, adding an activated porous carrier to a polyacrylic acid solution, filtering the solution and drying the solid to obtain a polyacrylic acid-modified carrier; and 2) through an equivalent-volume impregnation method, impregnating the polyacrylic acid-modified carrier in a metal precursor solution, and drying and roasting the impregnated carrier to prepare the supported metal nano catalyst. In the invention, the polyacrylic acid is used for dispersing the active metal to obtain the high-dispersing catalyst, wherein chain-like polyacrylic acid is adsorbed onto the surface and pores of the activated carrier, so that the metal particles are orientedly dispersed since the polyacrylic acid can be complexed with metal ions to prepare the high-dispersing nano catalyst. The method solves the problems of active metal agglomeration, non-uniform dispersion and poor catalytic activity due to impregnation method for industrially preparing the catalyst in the prior art.