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Process for preparing titanium dioxide-alumina compound oxide

A technology for composite oxides and manufacturing methods, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc. Complicated problems, to achieve the effect of being suitable for large-scale industrial production, rich and cheap sources of raw materials, and simple preparation process

Inactive Publication Date: 2008-06-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiCl 4 A method of impregnating alumina in ethanol solution or tetrabutyl titanate in isopropanol solution in the presence of TiO 2 Disadvantages of low dispersion on the surface of alumina
Although the chemical vapor deposition (CVD) method of Segawa et al. prepared TiO 2 -Al 2 o 3 TiO on composite oxide support 2 The dispersion is very high, but the disadvantage is that the preparation process is too complicated, and TiO 2 The content of TiO cannot be very high during the preparation process 2 Also blocks Al 2 o 3 the pores to make the pore size smaller
Kaneko et al. used the sol-gel method (Sol-gel) to prepare TiO 2 -Al 2 o 3 Composite oxide support, the shortcoming of this method is that TiO 2 -Al 2 o 3 The average pore size of the composite oxide is small, so it is not suitable as a catalyst carrier for diesel oil, hydrorefining of heavy distillate oil, etc.

Method used

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  • Process for preparing titanium dioxide-alumina compound oxide
  • Process for preparing titanium dioxide-alumina compound oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 120ml of 85% H 2 SO 4 The aqueous solution was added to 95g H under constant stirring 2 TiO 3 heated to 120°C to dissolve until completely dissolved to produce a light yellow transparent colloid, that is, Ti(SO 4 ) 2 solution, this is solution A.

[0027] Take 914g Al 2 (SO 4 ) 3 18H 2 Dissolve O in 12 liters of water to obtain Al 2 (SO 4 ) 3 Aqueous solution of B.

[0028] Add solution B dropwise to A under rapid stirring, adjust the pH value to 8-9 with ammonia water, let stand at 60°C for 6 hours; wash with water at 70°C until no SO 4 2- , dried at 150°C for 6 hours, and calcined at 650°C for 2 to 12 hours to obtain white TiO 2 / Al 2 o 3 powder.

[0029] After analysis, TiO 2 The mass percentage is 21%, TiO 2 / Al 2 o 3 The specific surface area of ​​the powder is 285m 2 / g, pore volume 0.60cm 3 / g, the average pore diameter is 9.1nm.

Embodiment 2

[0031] 120ml of 85% HNO 3 The aqueous solution was added to 95g H under constant stirring 2 TiO 3 , heated to 120°C to dissolve until a pale yellow transparent colloid was produced, that is, Ti(NO 2 ) 4 Solution A.

[0032] Take 200g NaAlO 2 Dissolve in 6 liters of water to get NaAlO 2 Aqueous solution of B.

[0033] Add solution B dropwise to A under rapid stirring, adjust the pH value to 8-9 with ammonia water, and let stand for 2 hours. Wash with water at 65°C until there is no nitrate ion, dry at 120°C for 10 hours, and bake at 550°C for 10 hours to obtain white TiO 2 / Al 2 o 3 powder.

[0034] After analysis, TiO 2 The mass percentage is 21%, and the specific surface area is 281m 2 / g, pore volume 0.62cm 3 / g, the average pore diameter is 9.2nm.

Embodiment 3

[0036] Add 120ml of 90% HCl aqueous solution to 95g of HCl under constant stirring 2 TiO 3 , heated to 120°C to dissolve until a light yellow transparent colloid was produced, namely TiCl 4 Solution A.

[0037] Take 116g NaAlO 2 Dissolve in 4 liters of water to get NaAlO 2 Aqueous solution of B.

[0038] Add solution A to B under rapid stirring, adjust the pH value to 8-9 with ammonia water, and let stand for 3 hours. Wash with water at 50°C until there is no chloride ion, dry at 130°C for 10 hours, and bake at 550°C for 8 hours to obtain white TiO 2 / Al 2 o 3 powder.

[0039] After analysis, TiO 2 The mass percentage is 30%, and the specific surface area is 263m 2 / g, pore volume 0.60cm 3 / g, the average pore diameter is 9.0nm.

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Abstract

The invention provides a preparation method for composite oxide of titanium dioxide / aluminum oxide is provided by the invention. The method comprises the steps: metatitanic acid dissolves in acidic condition into titanium solution, which is A solution; an aluminum source, which is meta-aluminate or inorganic acid salt of aluminum, dissolves into aluminum solution, which is B solution; the A solution and the B solution are mixed to acquire a product C, which is regulated to be alkaline, dried and baked at the temperature of 300 DEG C-700 DEG C, thus acquiring the composite oxide of titanium dioxide / aluminum oxide; mole ratio of the added metatitanic acid and the added aluminum source is 1:0.1-10; product thus acquired has high titanium content and high specific surface area, and has the same mechanical strength with like products.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and provides a method for manufacturing a composite oxide, in particular, relates to a method for manufacturing a titanium dioxide / alumina composite oxide. Background technique [0002] TiO 2 with Al 2 o 3 In comparison, its specific surface area is small, its strength is poor, and only γ-Al 2 o 3 one-fifth of. in TiO 2 Al 2 o 3 The preparation of the mixed carrier can increase the specific surface area of ​​the carrier and increase the strength of the carrier at the same time. TiO 2 -Al 2 o 3 Composite carriers can be prepared by different methods, such as co-precipitation, chemical vapor deposition, grafting, impregnation, and rubber mixing. All these methods can prepare TiO with high specific surface area 2 -Al 2 o 3 support, but a different preparation process for TiO 2 -Al 2 o 3 The surface structure and surface properties have a great influence. [0003] Japa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/06B01J21/04
Inventor 刘百军洪伟孟庆民
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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