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Catalyst for catalyzing and oxidizing oxynitride in flue gas and preparation process thereof

A nitrogen oxide, catalytic oxidation technology, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., can solve the problem of economical, expensive, ozone consumption Large and other problems, to achieve good denitration effect, improve the degree of oxidation, improve the effect of mechanical stability

Active Publication Date: 2010-09-08
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The publication number is CN1768902 Chinese invention patent adopts O 3 As an oxidant, directly oxidize NO in flue gas to NO which is easily soluble in water 2 , N 2 o 3 or N 2 o 5 , combined with lye to absorb denitrification, the flue gas denitrification effect is above 80%, but the ozone consumption is large and the price is relatively expensive, which affects the economy of this method

Method used

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  • Catalyst for catalyzing and oxidizing oxynitride in flue gas and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Preparation of catalyst Pt-K / SiO by equal volume impregnation method 2

[0035] Dry the mesoporous silica in a constant temperature drying oven at 105°C for 8 hours;

[0036] will KNO 3 Prepare solution I with water, immerse the treated mesoporous silica in solution I, soak at room temperature for 12 hours, dry at 105°C for 8 hours in a constant temperature drying oven, and then roast in a muffle furnace at 700°C for 2 hours;

[0037] put H 2 PtCl 6 Prepare solution II with water, and immerse K-loaded mesoporous silica in solution II for 12 hours at room temperature; dry at 105°C for 8 hours in a constant temperature drying oven, and then calcinate at 700°C for 2 hours in a muffle furnace. Finally, it was reduced in hydrogen at 500°C for 2 hours.

[0038] Wherein, the addition of potassium nitrate and chloroplatinic acid is K:Pt:SiO 2 (molar ratio) = 1:0.005:1.

[0039] Finally, the catalyst is obtained by grinding.

[0040] 2) Denitrification process

[004...

Embodiment 2

[0043] 1) Preparation of catalyst Pt-Mo / SiO by equal volume impregnation method 2

[0044] The mesoporous silica was vacuum-dried in a vacuum drying oven at 65°C for 3 hours;

[0045] will (NH 4 ) 6 Mo 7 O 24 The solution I was prepared with water, and the treated mesoporous silica was immersed in the solution I, immersed at room temperature for 12 hours, vacuum-dried at 65°C for 3 hours in a vacuum drying oven, and then calcined at 750°C in a muffle furnace for 2 hours. Hour;

[0046] put H 2 PtCl 6 Mixed with water to form solution II, the Mo-loaded mesoporous silica was immersed in solution II, immersed at room temperature for 12 hours, vacuum-dried at 65°C for 3 hours in a vacuum drying oven, and then calcined at 750°C in a muffle furnace 2 hours and finally reduction in hydrogen at 500°C for 2 hours.

[0047] Wherein, the additions of ammonium heptamolybdate and chloroplatinic acid are Mo:Pt:SiO 2 (molar ratio) = 0.25:0.005:1.

[0048] Finally, the catalyst is ...

Embodiment 3

[0052] 1) Preparation of catalyst Pt-K-Mo / SiO by equal volume impregnation method 2

[0053] The mesoporous silica was vacuum-dried in a vacuum drying oven at 65°C for 3 hours;

[0054] will KNO 3 and (NH 4 ) 6 Mo 7 O 24 Prepare solution I with water, immerse the treated mesoporous silica in solution I, soak at room temperature for 12 hours, vacuum dry at 65°C for 3 hours in a vacuum drying oven, and then calcinate at 700°C in a muffle furnace for 2 hours. Hour;

[0055] put H 2 PtCl 6 The solution II was prepared with water, and the mesoporous silica loaded with K and Mo was immersed in solution II, soaked at room temperature for 12 hours, vacuum-dried at 65°C for 3 hours in a vacuum drying oven, and then immersed in a muffle furnace for 700 ℃. calcined at °C for 2 hours, and finally reduced in hydrogen at 550 °C for 2 hours.

[0056] Wherein, the additions of potassium nitrate, ammonium heptamolybdate and chloroplatinic acid are K:Mo:Pt:SiO 2 (molar ratio) = 1:0.2...

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Abstract

The invention discloses a catalyst for catalyzing and oxidizing oxynitride in flue gas, which is prepared by using mesoporous silica as a vector, one or mixture of two of kalium and molybdenum as a doping component and platinum as an active component by adopting an equal-volume stepwise impregnation method. The invention also discloses a process for preparing the catalyst, and simultaneously discloses application of the catalyst in flue gas denitration process. Under the action of the catalyst, by utilizing oxygen contained in the flue gas per se, nitrogen oxide is oxidized into nitrogen dioxide which is easily dissolved in water, so that the oxidizability of nitric oxide in the flue gas can be improved, and the flue gas is absorbed and denitrated by utilizing alkali liquor. The kalium and polybdenum doped platinum-based catalyst prepared by the process has catalytic oxidation performance obviously superior to an undoped platinum-based catalyst, and has high denitration efficiency; and under the catalytic oxidation action of the kalium and polybdenum doped platinum-based catalyst, the NOx oxidizability in the oxidized flue gas is just between 45 and 65 percent, and the denitration side product nitrite can be reclaimed so as to realize recycling of the denitration product.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a catalyst for catalytic oxidation of nitrogen oxides in flue gas and a preparation process thereof. Background technique [0002] Among the existing denitrification technologies, the "oxidation-absorption" two-step denitrification technology has attracted the attention of researchers because of its high efficiency and economy, and is widely applicable to boilers of various scales. The key technology is to control the oxidation step, so that the flue gas nitrogen oxides NO x Nitric oxide NO with lower solubility is oxidized to nitrogen dioxide NO with higher solubility 2 , nitrous oxide N 2 O 3 or nitrous oxide N 2 O 5 Equal high-valence nitrogen oxides to facilitate subsequent absorption steps. In the oxidation step, gas-phase oxidation is generally the main method, and common gas-phase oxidation methods mainly include direct oxidation, photocatalytic oxidation and cat...

Claims

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Application Information

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IPC IPC(8): B01J23/58B01J23/652B01D53/86B01D53/56
Inventor 莫建松鞠耀明吴忠标程斌程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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