Preparing method of spherical titanium-aluminum composite carrier

Abstract

The invention relates to a preparing method of a spherical titanium-aluminum composite carrier. The preparing method is characterized by comprising the following steps: adding deionized water and titanium oxide into alumina gel and uniformly mixing; slowly adding an alginate solution, and stirring at high speed to prepare suspension slurry; dropping the suspension slurry into a multivalent metal cation solution to form spherical composite gel particles; and drying and roasting the gel particles to obtain the spherical titanium-aluminum composite carrier, wherein aluminum oxide hydrogel or nano aluminum oxide gel is adopted as the alumina gel; the adding amount of titanium oxide is 0.1-4 times the mass of alumina gel based on Al2O3, and the crystalline phase of titanium oxide is selected as anatase phase; the solid content of the suspension slurry is 5%-25%, and the content of alginate is 0.3%-5%; alginate is one or more of sodium alginate, potassium alginate, magnesium alginate and ammonium alginate; the multivalent metal cation solution is saline solutions containing aluminum ions, zinc ions, calcium ions, copper ions, iron ions, ferrous ions, cobalt ions, manganese ions or nickel ions, with the saturation concentration being 0.1mol / L.

Description

technical field [0001] The invention relates to the technical field of catalyst carriers, in particular to a method for preparing a spherical titanium-aluminum composite carrier. technical background [0002] Since the 1970s, TiO 2 As a new type of catalytic material with unique properties, it has attracted much attention. As a carrier, TiO 2 It has a strong interaction with the active components, which can change the adsorption and catalytic performance of the catalyst, and it has good photocatalytic performance, anti-coking and anti-poisoning capabilities. But due to TiO 2 There are few surface pores and the specific surface area is lower than other commonly used metal oxide supports, making TiO 2 The amount of single-layer dispersed active components that can be loaded is very small; at the same time, its surface is easy to shrink when heated, and it is easy to change from anatase phase to low-activity rutile phase; in addition, TiO 2 It is not easy to shape and is n...

AI Technical Summary

Problems solved by technology

However, titanium oxide and aluminum oxide are mixed powders, which are difficult to disperse uniformly, which is not conducive to giving full play to the performance of the two. After molding, a coating cross-linking reaction is required, which will cause the migration of internal aluminum oxide, resulting in the oxidation of the ball from the inside to the outside. The content of titanium is gradually reduced