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Composite catalyst for catalytically oxidizing nitrogen oxide and preparation method of composite catalyst

A composite catalyst, nitrogen oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of limited application and complex catalyst preparation process, etc. To achieve the effect of simple and easy preparation process, good application prospect and simple preparation method

Inactive Publication Date: 2013-06-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this catalyst is complicated, which limits its industrial application.

Method used

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  • Composite catalyst for catalytically oxidizing nitrogen oxide and preparation method of composite catalyst
  • Composite catalyst for catalytically oxidizing nitrogen oxide and preparation method of composite catalyst
  • Composite catalyst for catalytically oxidizing nitrogen oxide and preparation method of composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of catalyst carrier in the present embodiment:

[0033] Add 0.5g of scallop powder to 50g of zirconia (analytical pure) powder, stir well, add 17ml of distilled water, stir evenly to form a paste, dry in an oven at 60°C for 5 hours to obtain a blocky solid, crush the blocky solid Sieve to obtain 20-40 mesh particles, which is the catalyst carrier.

[0034] The load of catalyst in the present embodiment:

[0035] After taking 3g of the catalyst carrier and adding water by the equal volume impregnation method, the solid-liquid ratio was measured to be 1g: 0.78ml; the Mn(NO 3 ) 2 Solution 3.42ml, containing Mn(NO 3 ) 2 2.60g, diluted with distilled water to 7.80ml, mixed evenly, added to 10g of catalyst carrier, left at room temperature for 24h, then dried at 60°C for 5h, 110°C for 10h, and finally placed in air atmosphere at 450°C for 3h to obtain Mn8 / ZrO 2 The composite catalyst is designated as Catalyst 1.

[0036] Change the volume of the mangan...

Embodiment 2

[0041] The preparation of catalyst carrier in the present embodiment:

[0042] Add 0.5g of scallop powder to 50g of zirconia (analytically pure) powder, stir well, add 17ml of distilled water, stir evenly to form a paste, dry in an oven at 60°C for 5 hours, and obtain a blocky solid, crush the blocky solid Sieve to obtain 20-40 mesh particles, which is the catalyst carrier.

[0043] The loading of catalyst in this embodiment

[0044] Take 3g of catalyst carrier and add water by equal volume impregnation method, and measure its solid-liquid ratio as 1g:0.6ml; weigh 4.242g of cobalt nitrate hexahydrate and add it to 6ml of distilled water, add 10g of catalyst carrier after it dissolves, let stand at room temperature for 24h, then Dry at 60°C for 5h, dry at 110°C for 12h, and finally place in an air atmosphere at 350°C for 3h to prepare Co8.6 / ZrO 2 The composite catalyst is recorded as catalyst 4, and the molar number of metal elements in the active components of catalyst 4 is ...

Embodiment 3

[0050] The preparation of catalyst carrier in the present embodiment:

[0051] Add 0.5g of scallop powder to 50g of zirconia (analytically pure) powder, stir well, add 17ml of distilled water, stir evenly to form a paste, dry in an oven at 60°C for 5 hours, and obtain a blocky solid, crush the blocky solid Sieve to obtain 20-40 mesh particles, which is the catalyst carrier.

[0052] The loading of catalyst in this embodiment

[0053] Take 3g of catalyst carrier and add water by equal volume impregnation method, and measure its solid-liquid ratio as 1g:0.6ml; weigh 0.31g of cerium nitrate hexahydrate and add it to 2.58ml of distilled water, and after it dissolves, add 50% Mn(NO 3 ) 2 Solution 3.42ml, containing Mn(NO 3 ) 2 2.60g, mixed evenly, added to 10g catalyst carrier, left at room temperature for 24h, then dried at 60°C for 5h, 110°C for 12h, and finally placed in air atmosphere at 450°C for 3h to obtain Mn8Ce1 / ZrO 2 The composite catalyst is designated as Catalyst 8...

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Abstract

The invention discloses a composite catalyst for catalytically oxidizing nitrogen oxide and a preparation method of the composite catalyst. The composite catalyst is prepared by adopting zirconium oxide as a catalyst carrier, and loading active components and assistants on the catalyst carrier, wherein the active components are oxides of transition metals; and the assistants are oxides of rare-earth metals. The composite catalyst is prepared by the equivoluminal impregnation method. The composite catalyst, disclosed by the invention, can reach 84% NO oxidation rate at the catalytic reaction temperature of 300 DEG C. Generated NO2 can be integrally absorbed and removed with the SO2 in the smoke under the downstream smoke wet desulphurization. The oxidization-absorption method of the nitrogen oxide brings no secondary pollution and is economic and effective, and can be applied to removal of nitrogen oxide in the boiler gas and desulfurization and denitrification integrated technology.

Description

1. Technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a composite catalyst for catalytic oxidation of nitrogen oxides and a preparation method thereof, which is used for catalytic oxidation of nitrogen oxides in coal-fired flue gas. 2. Background technology [0002] my country is a large coal-burning country, and coal-fired power plants emit a large amount of nitrogen oxides (NO x ), while NO x It is one of the important pollutants in the atmosphere. Nitrogen oxides can cause acid rain, photochemical smog, greenhouse effect, and damage to the ozone layer. Therefore, the removal of nitrogen oxides becomes particularly important. At present, the focus of research on the removal of nitrogen oxides by catalytic method is to use NH 3 Reductant for reducing nitrogen oxides to N 2 Selective catalytic reduction (SCR) technology. But the method consumes NH 3 , the reduction product is N 2 There is no recycling value; an...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/83B01J21/06B01D53/86B01D53/56
CPCY02A50/20
Inventor 张先龙程俊楠杨保俊吴雪平王百年张恒建张连凤
Owner HEFEI UNIV OF TECH
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