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Preparing method of spherical titanium-aluminum composite carrier

A composite carrier, titanium-aluminum technology, applied in the direction of catalyst carrier, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problems of internal alumina migration, reduction of titanium oxide content in small balls, unfavorable problems, etc., and achieve good bonding performance, shorten the production process steps, and realize the effect of industrialized continuous production

Active Publication Date: 2015-02-18
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] At room temperature, use 15% nitric acid as the bottom liquid, gradually add sodium metaaluminate solution with a solid content of 10-20% by weight based on alumina for reaction under stirring, control the pH at the end point to 6-8.5, and directly carry out plate and frame filtration after the reaction and removing impurities to obtain an alumina hydrogel with a dry basis content of 15-30% by weight.

Embodiment 2

[0022] Take 500g of alumina hydrogel with a dry basis content of 20% prepared according to Example 1; add 20g of anatase titanium dioxide and stir evenly; then slowly add 400g of sodium alginate solution with a concentration of 2% by weight and stir at a high speed to prepare Suspension slurry; drop the suspension slurry into an aluminum nitrate solution with an aluminum ion concentration of 1mol / L to form composite gel particles; take out the gel particles, dry at 120°C for 10 hours, and then bake at 550°C for 4 hours to obtain a spherical shape Titanium-aluminum composite carrier.

[0023] Analyze and characterize the product: particle size: 2.0±0.05mm; average strength: 90N / particle; pore volume: 0.85ml / g; specific surface area: 250m 2 / g.

Embodiment 3

[0025] Take 500 g of alumina hydrogel with a dry basis content of 20% prepared according to Example 1; add 100 g of anatase titanium dioxide, 600 g of sodium alginate solution with a concentration of 3% by weight, and stir at a high speed to uniformly make a suspension slurry; Drop the suspension into an aluminum nitrate solution with an aluminum ion molar concentration of 0.5 mol / L to form composite gel particles; take out the gel particles, dry them at 120°C for 10 hours, and then bake them at 550°C for 4 hours to obtain spherical titanium-aluminum composites. carrier.

[0026] Analyze and characterize the product: particle size: 2.15±0.05mm; average strength: 55N / particle; pore volume: 0.65ml / g; specific surface area: 215m 2 / g.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/06
Inventor 孙彦民杨文建于海斌李晓云孟广莹王康周鹏李俊张雪梅张利杰
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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