Process for preparing compound Ti-base oxide for reversible adsorption of nitrogen oxide

A composite oxide and nitrogen oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve complex processes, poor sulfur resistance, and adsorbents. Problems such as poor thermal stability, to achieve the effect of high adsorption capacity, high thermal stability and low cost

Inactive Publication Date: 2002-07-03
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is complicated, with alumina as the main adsorption substrate material, and the sulfur resistance is poor.
[0007] W.B.Li et al. (Energy & Fuels 1997, 11:428) found that

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 8.66 milliliters of tetrabutyl titanate (TBT) and a certain amount of tetrabutyl silicate (Si(OC 2 h 5 ) 4 ) was diluted into a controllable amount of absolute ethanol to form solution A, and an appropriate amount of dilute nitric acid and water were added to a certain amount of absolute ethanol to form solution B. Acid solution B was added dropwise to solution A under stirring conditions, and the molar ratio between the reactants was maintained as TBT: ethanol: nitric acid: water: Si(OC 2 h 5 ) 4 =1:30:0.05:4:0.1. Stir at 20°C until a gel is formed, age for a period of time, and then repeatedly suction-filter with deionized water, and dry in a water bath at 80°C. The resulting SiO with a molar ratio of 0.1:1 2 / TiO 2 Solid powder, after roasting at 450°C, its BET specific surface area is measured to be 246m 2 / g.

[0024] The solid powder obtained above is impregnated with nickel nitrate solution, then dried at 100°C, and then calcined at 450°C to obtain ...

Embodiment 2

[0026] Take 8.66 milliliters of tetrabutyl titanate (TBT) and dilute it into a controllable amount of absolute ethanol to form solution A, and add an appropriate amount of Al(NO 3 ) 3 Add appropriate amount of dilute nitric acid aqueous solution to a certain amount of absolute ethanol to form solution B. The acid solution B was added dropwise to the solution A under stirring condition, and the molar ratio between the reactants was maintained as TBT:methanol:hydrochloric acid:water:aluminum nitrate=1:45:0.015:6:0.2. Stir at 50°C until a gel is formed, age for a period of time, and then repeatedly suction-filter with deionized water, and dry in a water bath at 80°C. This gives a molar ratio of 0.2:1 Al 2 o 3 / TiO 2Solid powder, after roasting at 450°C, its BET specific surface area is measured to be 180m 2 / g.

[0027] The solid powder obtained above is impregnated with nickel nitrate solution, then dried at 100°C, and then calcined at 450°C to obtain 2% NiO-Al with a weig...

Embodiment 3

[0031] Take 8.66 milliliters of tetrabutyl titanate and dilute it into a certain amount of absolute ethanol to make solution 1, add a certain amount of barium acetate in proportion to an appropriate amount of glacial acetic acid and deionized water to make solution 2. Keep the molar ratio between the reactants The ratio is TBT:ethanol:acetic acid:water:barium acetate=1:6:2:5:0.1. Stir at 30°C until a gel is formed, age for a period of time, and then repeatedly suction-filter with deionized water, and dry in a water bath at 80°C. The resulting BaO / TiO with a molar ratio of 0.1:1 2 Solid powder, after roasting at 450°C, its BET specific surface area is measured to be 150m 2 / g.

[0032] The solid powder obtained above is impregnated with manganese nitrate solution, then dried at 100°C, and then roasted at 450°C to obtain 3.2% MnO with a weight ratio of 3.2% of manganese oxide. 2 -BaO / TiO 2 solid powder.

[0033] The above 3.2% MnO 2 -Al 2 o 3 / TiO 2 The solid powder is ...

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Abstract

A compound Ti-base oxide for reversible adsorptino to nitrogen oxide is prepared through preparing a compound Ti-base oxide with high specific surface area and anatase structure by sol-gel method, immersing its solid powder in the solution of soluble salt of transition metal compound, baking and calcine. Its advantages include high adsorption capacity, high regeneration speed, and converting released nitrogen oxide to nitrogen gas.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a preparation method of a titanium-based adsorbent used for adsorbing and purifying nitrogen oxides. Background technique [0002] Nitrogen oxides are one of the important air pollutants. It can cause acid rain and urban photochemical smog, and is highly toxic to the human respiratory tract and heart and lung organs. In addition to the selective catalytic reduction method, the adsorption method for the purification of low concentration NOx has also attracted great attention. This method can firstly adsorb NOx, and then release it from the solid adsorbent after being concentrated by changing the temperature and partial pressure. an alternative path. The adsorbent used has Y-Ba-Cu-O (K.Tabaki et al, Chem.Lett., 1988: 799), Ba-Cu-O (Machida et al, J.Chem.Soc. , Chem.Commu., 1990:1165) and Y-Sr-Co-O, etc., the disadvantage is that such adsorbent elements are ea...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J21/06B01J23/30
Inventor 黎维彬马红马永亮郝吉明
Owner TSINGHUA UNIV
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