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Catalyst used for ammonia selective catalytic reduction of nitrogen oxides to nitrogen gas and preparation method thereof

A nitrogen oxides, selective technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of short catalyst life, blocked downstream pipelines, catalyst failure It can prolong the life, improve the utilization rate, and reduce the oxidation activity.

Inactive Publication Date: 2009-10-14
无锡科立泰科技有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although SCR technology has been industrialized and has some advantages, it still has some disadvantages, such as short catalyst life, low activity of traditional vanadium-titanium-based catalysts, high sulfur dioxide oxidation activity, and a lot of sulfate Formation causes catalyst deactivation and clogs downstream piping

Method used

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  • Catalyst used for ammonia selective catalytic reduction of nitrogen oxides to nitrogen gas and preparation method thereof
  • Catalyst used for ammonia selective catalytic reduction of nitrogen oxides to nitrogen gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 catalyst composition is V 2 o 5 1%, WO 3 1%, TiO 2 1%, BaO2%, γ-Al 2 o 3 95%.

[0029] 1.1 Modified γ-Al 2 o 3 Preparation: (dipping method) take 95g γ-Al 2 o 3 Dry at about 500°C, add 0.05M Ba(NO 3 ) 2 Aged in 260ml of aqueous solution for 1 hour, then dried at 60-150°C and calcined at 300°C for 24 hours to obtain BaO / γ-Al 2 o 3 A total of 97g;

[0030] 1.2 load V 2 o 5 -WO 3 / TiO 2 Catalyst: (impregnation method) BaO / γ-Al 2 o 3 Add 0.25M titanium isopropoxide ethanol solution to 50ml for aging for 24 hours, then dry at 60-150°C, and then roast at 600°C for 1 hour to obtain 98gTiO 2 / BaO / γ-Al 2 o 3 ; Then TiO 2 / BaO / γ-Al 2 o 3, add ammonium metavanadate (or vanadium oxysulfate, vanadium dichloride, vanadium trichloride) (0.27M) and ammonium metatungstate (0.22M) in 200ml of oxalic acid (0.5% by weight) aqueous solution for aging for 10 hours , then dried at 60-150°C, and calcined at 500°C for 10 hours to obtain 100g V 2 o 5 -...

Embodiment 2

[0031] Embodiment 2 catalyst composition is V 2 o 5 2%, WO 3 5%, TiO 2 3%, BaO 5%, γ-Al 2 o 3 85%.

[0032] 2.1 Modified γ-Al 2 o 3 Preparation: (dipping method) take 85g γ-Al 2 o 3 Dry at about 500°C, add 0.8M Ba(NO 3 ) 2 Aging in 40ml of aqueous solution for 5 hours, then drying at 60-150°C and roasting at 400°C for 15 hours to obtain BaO / γ-Al 2 o 3 A total of 90g;

[0033] 2.2 load V 2 o 5 -WO 3 / TiO 2 Catalyst: (impregnation method) BaO / γ-Al 2 o 3 Add 0.125M titanium isopropoxide ethanol solution to 300ml for aging for 20 hours, then dry at 60-150°C, and then roast at 300°C for 5 hours to obtain 93g of TiO 2 / BaO / γ-Al 2 o 3 ; the TiO 2 / BaO / γ-Al 2 o 3 Add vanadyl sulfate (0.37M) and ammonium metatungstate (0.07M) into 300ml of oxalic acid (2% by weight) aqueous solution for aging for 20 hours, then dry at 60-150°C, and bake at 400°C for 8 hours , to get 100g V 2 o 5 -WO 3 / TiO 2 / BaO / γ-Al 2 o 3 .

Embodiment 3

[0034] Embodiment 3: Catalyst composition is V 2 o 5 2%, WO 3 8%, TiO 2 15%, BaO 15%, γ-Al 2 o 3 60%.

[0035] 3.1 Modified γ-Al 2 o 3 Preparation: (dipping method) take 60g γ-Al 2 o 3 Dry at about 500°C, add 0.49M Ba(NO 3 ) 2 Aging in 200ml of aqueous solution for 5 hours, then drying at 60-150°C, and roasting at 500°C for 5 hours to obtain BaO / γ-Al 2 o 3 75g in total,

[0036] 3.2 Load V 2 o 5 -WO 3 / TiO 2 Catalyst: (impregnation method) BaO / γ-Al 2 o 3 Add 0.70M titanium isopropoxide ethanol solution to 450ml for aging for 10 hours, then dry at 60-150°C, and then roast at 300°C for 12 hours to obtain 90g of TiO 2 / BaO / γ-Al 2 o 3 ; the TiO 2 / BaO / γ-Al 2 o 3 , add vanadium trichloride (0.04M) and ammonium metatungstate (0.14M) into 250ml of oxalic acid (0.5% by weight) aqueous solution for aging for 5 hours, then dry at 60-150°C, and roast at 500°C for 8 hour, get 100g V 2 o 5 -WO 3 / TiO 2 / BaO / γ-Al 2 o 3 .

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Abstract

The invention relates to a 'catalyst used for ammonia selective catalytic reduction of nitrogen oxides to nitrogen gas and a preparation method thereof', and belongs to the catalyst technical filed. The catalyst consists of V2O5-WO3 / TiO2 / BaO / gamma-Al2O3. The catalyst takes gamma-Al2O3 as a carrier, which increases specific surface area of the catalyst and lowers the catalyst carrier cost; BaO is added to protect the carrier against sulfation, reduce oxidization activity on sulfur dioxide and prolong service life of the catalyst; and titanium dioxide is highly dispersed on surface of the carrier, thus improving utilization rate of the titanium dioxide. The catalyst is characterized by low cost, high catalytic activity and very low activity to oxidize sulfur dioxide to sulfur trioxide.

Description

technical field [0001] The invention relates to the technical field of catalytic reduction, in particular to a catalyst for selective catalytic reduction of nitrogen oxides into nitrogen by ammonia and a preparation method thereof. technical background [0002] Nitrogen oxides (NOx) mainly include N 2 O, NO, N 2 o 3 , NO 2 , N 2 o 4 , N 2 o 5 Compounds such as NOx are the main air pollutants. The total amount of NOx emitted into the atmosphere around the world reaches 50 million tons every year, and it is still growing. Therefore, research on NOx control is one of the main contents in the field of global environmental protection. [0003] There are two ways to produce NOx: one is natural production, and the other is artificial production. Natural sources include lightning, ammonia oxidation in the atmosphere, and nitrification of microorganisms in the soil. The NOx formed in nature has reached an ecological balance due to natural selection, so it does not pollute th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/22B01D53/56
Inventor 齐共新
Owner 无锡科立泰科技有限公司
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