A kind of preparation method of vanadium-based supported denitration catalyst

A denitrification catalyst and supported technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of easy shrinkage of the surface, small specific surface area, instability, etc., and achieve good surface properties, large specific The effect of surface area and efficiency improvement

Inactive Publication Date: 2011-12-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, V 2 o 5 / TiO 2 (Anatase) is a rather unstable system, TiO 2 (Anatase) is a metastable crystal in titanium oxide with a small specific surface area. When heated, the surface is easy to shrink, and it is easy to transform into rutile with a relatively stable thermodynamic state under certain temperature and pressure conditions. WO 3 and MoO 3 The addition of helps to prevent the conversion of anatase form, but cannot fundamentally solve the above problems, so how to solve this problem becomes the key

Method used

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  • A kind of preparation method of vanadium-based supported denitration catalyst
  • A kind of preparation method of vanadium-based supported denitration catalyst
  • A kind of preparation method of vanadium-based supported denitration catalyst

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Embodiment 1

[0030] Add 0.0259g ammonium metavanadate (NH 4 VO 3 ) was dissolved in oxalic acid solution, 2gγ-Al 2 o3 Dissolve in ammonium tungstate solution, dip in oil bath (80°C) with stirring, evaporate to dryness, and dry in an oven at 110°C for 12 hours. The dried samples were ground and calcined at 500°C for 6h in air atmosphere. That is, 1% V 2 o 5 / γ-Al 2 o 3 .

Embodiment 2

[0032] Immerse 4.75g of γ-Al with 75ml of n-butanol solution containing 1.0652g of n-butyl titanate 2 o 3 Carrier (γ-Al 2 o 3 The carrier was pre-calcined in air atmosphere at 700°C for 6h, and the specific surface area was 156m 2 g -1 ), so that TiO 2 The proportion in the composite carrier is 5%. To make TiO 2 Can be better in γ-Al 2 o 3 Disperse on the surface, control the hydrolysis rate of n-butyl titanate, and make the gel more uniform. The impregnated sample adopts the environment of ice water bath, and the 2 Stir and hydrolyze at 20-30r / s for 24 hours under the protection of the atmosphere. After the reaction is complete, age at room temperature for 24 hours, then evaporate the water in an oil bath (80°C), and bake in an oven at 110°C for 12 hours. The dried samples were ground to 40-60 meshes and then calcined at 600°C for 4 hours in an air atmosphere.

[0033] active species V 2 o 5 The precursor is ammonium vanadate (NH 4 VO 3 ), with 0.0259g NH 4 VO ...

Embodiment 3

[0035] Immerse 4.5g of γ-Al with 75ml of n-butanol solution containing 2.1304g of n-butyl titanate 2 o 3 Carrier (γ-Al 2 o 3 The carrier was pre-calcined in air atmosphere at 700°C for 6h, and the specific surface area was 156m 2 g -1 ), so that TiO 2 The proportion in the composite carrier is 10%. To make TiO 2 Can be better in γ-Al 2 o 3 Disperse on the surface, control the hydrolysis rate of n-butyl titanate, and make the gel more uniform. The impregnated sample adopts the environment of ice water bath, and the 2 Stir and hydrolyze at 20-30r / s for 24 hours under the protection of the atmosphere. After the reaction is complete, age at room temperature for 24 hours, then evaporate the water in an oil bath (80°C), and bake in an oven at 110°C for 12 hours. The dried samples were ground to 40-60 meshes and then calcined at 600°C for 4 hours in an air atmosphere.

[0036] active species V 2 o 5 The precursor is ammonium vanadate (NH 4 VO 3 ), with 0.0259g NH 4 VO ...

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Abstract

The invention discloses a preparation method of a vanadium-based loaded denitration catalyst. Under the conditions of ice-water bath, N2 atmosphere protection and stirring, the n-butanol solution of butyl titanate is impregnated with γ-Al2O3 powder, and after aging, it is placed in an oil bath. Evaporate to dryness, and then dry in an oven. After the dried product is ground, it is roasted in an air atmosphere to obtain a titanium-aluminum composite carrier; add a titanium-aluminum composite carrier and ammonium metavanadate in deionized water, and stir at room temperature Dipping, evaporating to dryness in an oil bath, and drying in an oven. The dried product is ground and roasted in an air atmosphere to obtain a vanadium-based supported denitration catalyst. The vanadium-based supported denitration catalyst prepared by the method of the present invention has the following advantages: 1. The catalyst has a relatively large specific surface area, and at the same time, its crystal form is stable and has good surface properties. 2. It has a wider reaction window, and has a higher out-of-stock efficiency at a lower temperature, which is generally higher than that of simply using aluminum as a carrier.

Description

technical field [0001] The invention belongs to the technical field of out-of-stock catalysts, and in particular relates to a preparation method of an alum-based loaded denitration catalyst with titanium-aluminum as a composite carrier. Background technique [0002] my country is a country that uses coal as the main energy source. The extensive use of coal has brought SO 2 , NOx emissions, of which my country has controlled SO in two control areas 2 A comprehensive control work has been carried out for the emission of coal-fired units. By the end of 2007, the proportion of flue gas desulfurization units in coal-fired units had risen to more than 40%. 2 After reaching a record high in 2006, emissions began to decline year by year. However, the rapid growth of total NOx emissions is likely to offset the impact on SO 2 The control effect of acid rain cannot be fundamentally controlled. According to the statistics of the State Environmental Protection Administration, in 2005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01D53/86B01D53/56
Inventor 张亚平宋静焦峰斌赵琳琳沈凯
Owner SOUTHEAST UNIV
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