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Catalyst for selective catalytic reduction of nitric oxide and preparation method of catalyst

A technology for nitrogen oxides and catalysts, which is applied in the field of catalysts for selective catalytic reduction of nitrogen oxides and their preparation, can solve the problems of poor high-temperature stability, narrow active temperature window, poor low-temperature activity, etc., and achieves improved low-temperature activity and preparation method. Simple and easy to use, the effect of reducing the amount of use

Inactive Publication Date: 2016-11-16
碗海鹰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst has been used industrially for many years, it still has poor low-temperature activity, narrow activity temperature window, poor high-temperature stability, SO 2 Oxidation to SO 3 And other issues

Method used

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  • Catalyst for selective catalytic reduction of nitric oxide and preparation method of catalyst
  • Catalyst for selective catalytic reduction of nitric oxide and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment is a catalyst for selective catalytic reduction of nitrogen oxides, wherein: the catalyst comprises SAPO-34 molecular sieve and Cu metal supported on the molecular sieve, and is made of SAPO-34 molecular sieve and copper nitrate, wherein the Cu metal is The mass ratio of the mass to the SAPO-34 molecular sieve was 0.01. Among them, molecular sieve BET specific surface area ≥ 500m 2 / g.

[0024] The preparation method is as follows:

[0025] 1) drying the SAPO-34 molecular sieve at a temperature of 100 ° C for 2 hours to remove the moisture adsorbed by the molecular sieve;

[0026] 2) mixing copper nitrate with water, stirring and dissolving to obtain a solution, the volume of which is the mass×specific pore volume of the pretreated molecular sieve in step 1);

[0027] 3) Stir and mix the copper nitrate solution prepared in step 2) and the pretreated SAPO-34 molecular sieve in step 1), place it in an oven to dry at a temperature of 100° C. for 2 hours,...

Embodiment 2

[0030] The present embodiment is a catalyst for selective catalytic reduction of nitrogen oxides, wherein: the catalyst includes beta molecular sieve and Fe and Ce metals supported on the molecular sieve, and is made of beta molecular sieve, ferric nitrate and cerium nitrate, wherein Fe metal The mass ratio to Ce metal is 1:4, and the mass ratio of the total mass of Fe metal to Ce metal to β molecular sieve is 0.10. Among them, molecular sieve BET specific surface area ≥ 500m 2 / g.

[0031] The preparation method is as follows:

[0032] 1) drying the beta molecular sieve at a temperature of 120 ° C for 4 hours to remove the moisture adsorbed by the molecular sieve;

[0033] 2) mixing ferric nitrate and cerium nitrate with water, stirring and dissolving to obtain a solution, and the volume of the solution is the mass×specific pore volume of the molecular sieve after the pretreatment in step 1);

[0034] 3) Stir and mix the ferric nitrate and cerium nitrate mixed solution pre...

Embodiment 3

[0037] This embodiment is a catalyst for selective catalytic reduction of nitrogen oxides, wherein: the catalyst includes SSZ-13 molecular sieve and Cu metal supported on the molecular sieve, and is made of SSZ-13 molecular sieve and copper nitrate, wherein the Cu metal is made of SSZ-13 molecular sieve and copper nitrate. The mass ratio of mass to SSZ-13 molecular sieve is 0.03. Among them, molecular sieve BET specific surface area ≥ 500m 2 / g.

[0038] The preparation method is as follows:

[0039] 1) drying the SSZ-13 molecular sieve at a temperature of 105 ° C for 3 hours to remove the moisture adsorbed by the molecular sieve;

[0040] 2) mixing copper nitrate with water, stirring and dissolving to obtain a solution, the volume of which is the mass×specific pore volume of the pretreated molecular sieve in step 1);

[0041] 3) Stir and mix the copper nitrate solution prepared in step 2) and the pretreated SSZ-13 molecular sieve in step 1), place it in an oven to dry at a t...

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Abstract

The invention belongs to the technical field of environmental protection and catalysts, and particularly relates to a catalyst for selective catalytic reduction of nitric oxide and a preparation method of the catalyst. The catalyst comprises a molecular sieve and transition metal supported on the molecular sieve and is prepared from the molecular sieve and a transition metal precursor, and the molecular sieve is dried to remove adsorbed water; then the metal precursor is mixed with water, stirring is carried out for dissolving, and a solution is prepared; the prepared solution and the prepared molecular sieve are stirred and mixed, standing, drying and calcining are carried out, the product is cooled to normal temperature, and the catalyst for selective catalytic reduction of nitric oxide is obtained. The molecular sieve is used as a carrier, an effective surface is provided for adsorption and reacting of nitric oxide, high dispersion of active components can be kept, and the use amount of the active components can be reduced. By means of the characteristics of the carrier and the synergetic effect among different kinds of metals, the low temperature activity of the catalyst is improved, and the active window temperature range of the catalyst is widened. The preparation method of the catalyst is simple, easy to carry out and free of pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and catalysts, and particularly relates to a catalyst for selective catalytic reduction of nitrogen oxides and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere, which can not only cause problems such as acid rain, photochemical smog and ozone layer destruction, but also seriously affect human health and endanger human life. NO in the air x It mainly comes from stationary sources such as flue gas from industrial boilers and coal-fired power plants, as well as mobile sources such as vehicle exhaust and ship exhaust. How to effectively remove NO from these two types of emission sources x has become a global issue. [0003] NO x The removal technologies include: wet removal technology, storage reduction technology (NSR), direct catalytic decomposition technology, plasma removal technology, selectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J29/76B01J29/46B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J29/46B01J29/76B01J29/7615B01J29/85B01J35/617
Inventor 碗海鹰
Owner 碗海鹰
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