Rare-earth cerium doped alumina nano fiber catalyst carrier material and preparation method thereof

Abstract

The invention relates to a rare-earth cerium doped alumina nano fiber membrane catalyst carrier material and preparation technology thereof. The nano fiber membrane catalyst carrier material consists of gamma-type alumina nano fiber with the diameter ranging from 50 to 200 nm, and the mass percentage formula of the fiber comprises 80 to 95 weight percent of alumina and 5 to 20 weight percent of cerium oxide. The preparation method of the catalyst carrier material adopts the mass percentage formula and following process steps: (1) preparing sol-gel electrostatic spinning solution; (2) preparing an organic / inorganic hybrid nano fiber material by the prepared sol-gel spinning solution by electrostatic spinning; and (3) putting the prepared nano fiber membrane in a muffle furnace, and calcining the nano fiber membrane at a high temperature to obtain the alumina nano fiber membrane catalyst carrier material. The prepared rare-earth cerium doped alumina nano fiber membrane is a catalyst and a carrier material with high specific surface area, good heat stability and excellent mechanical property, greatly improves the phase transition temperature of the gamma-Al2O3 nano fiber carrier material through doping the rare-earth cerium, and simultaneously endows the material with excellent oxygen storage and release function.

Description

technical field [0001] The invention relates to a method for preparing inorganic nano-oxide fibers, in particular to the technical field of preparation of rare earth cerium-doped alumina nanofiber membrane catalyst carrier materials by an electrospinning method. Background technique [0002] Alumina fiber is a new type of ultra-light high-temperature refractory material. Compared with non-oxide fibers such as carbon fiber and silicon carbide fiber, alumina fiber not only has excellent properties such as high strength, high modulus, and good chemical resistance, And it also has good high temperature oxidation resistance, corrosion resistance and electrical insulation. At present, many companies at home and abroad have produced various types of high-performance alumina fibers. DuPont of the United States uses the slurry method to produce FP alumina fibers, with an alumina content of 99.9% [Lavaste V, Berger M H, Bunsell A R et al.Microstructure and mechanical characteristics ...

AI Technical Summary

Problems solved by technology

However, due to alumina (Al 2 o 3 ) has a variety of crystal structures, among which γ-Al 2 o 3 With the characteristics of large specific surface area and high reactivity, it can be used for petroleum cracking, automobile exhaust purification catalysts and their carrier materials. Under high temperature conditions, Al 2 o 3 Through the migration of anion and cation vacancies on the surface, the γ crystal form will change to the θ and α crystal forms, thereby reducing the specific surface area and reducing the catalytic performance of the catalyst.