Supported SCR denitration catalyst of medium and low temperature flue gas and preparation method and application thereof

A denitration catalyst, low temperature flue gas technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Strong sulfur poisoning ability, strong anti-sulfur poisoning, simple preparation effect

Inactive Publication Date: 2010-07-14
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many researches on SCR catalytic technology with oxides such as W, Mo and Ce as the main active components, such as Chinese patents CN1593752A, CN1792431A, CN101433837A, CN101352679A, CN101396655A, CN101422728A, etc. The content of W and Mo in such SCR catalysts is high, so It causes high manufacturing cost, and the SCR active temperature range is generally 300-400°C
There are few studies on medium and low temperature flue gas SCR catalysts, and CuO / Al studied by Centi et al. 2 o 3 Catalyst at NO815ppm, NH 3 818ppm, O 2 3%, under the condition of 250℃, the conversion rate of NO is about 60%, but it is affected by SO 2 Great influence (Journal of Catalysis, 1995, 151:75-92)
Chinese patent CN101411984A adopts the co-precipitation method to produce an SCR catalyst in the form of oxides such as Fe-O-Ti, NO 500ppm, NH 3 500ppm, O 2 5%, at 250°C, the conversion rate of NO is over 95%, but a small amount of SO is introduced 2 (100ppm) after 30h activity dropped to 60%
However, high vanadium SCR catalysts have oxidized SO 2 Cheng SO 3 question, SO 3 with water and NH 3 Sulfate is generated and deposited on the surface of the catalyst, reducing catalyst activity and life, while SO 3 Severe corrosion of pipeline equipment, increasing equipment costs
Therefore, the above medium and low temperature SCR catalysts still have certain limitations.

Method used

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  • Supported SCR denitration catalyst of medium and low temperature flue gas and preparation method and application thereof
  • Supported SCR denitration catalyst of medium and low temperature flue gas and preparation method and application thereof
  • Supported SCR denitration catalyst of medium and low temperature flue gas and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Catalyst preparation

[0029] First, 4g oxalic acid (C 2 h 2 o 4 ·H 2 O) Dissolve in 20mL 60°C deionized water; add 0.51g ammonium metavanadate (in V 2 o 5 Accounting for 2wt% of the total catalyst content) and 2.43g copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O) and 2.26g manganese acetate tetrahydrate (Mn(CH 3 COO) 2 4H 2 O) (with CuO and MnO 2 Accounting for 8wt% of the total catalyst content), fully stirred to obtain mixed metal salt solution; 18g anatase TiO 2 Add it into the mixed metal salt solution (accounting for 90wt% of the total catalyst content), stir for 4 hours, and dry at 90°C for 24 hours. mesh particles to obtain a loaded SCR denitrification catalyst for medium and low temperature flue gas, which is ready for use.

[0030] (2) Catalyst evaluation

[0031] Put the catalyst obtained above into a stainless steel reaction tube, and use a programmed temperature controller to heat the fixed-bed reactor to a certain temperature (200-350°C);...

Embodiment 2

[0035] (1) Catalyst preparation

[0036] First add about 3g of oxalic acid (C 2 h 2 o 4 ·H 2 O) dissolved in 20mL 50°C deionized water; add 0.26g ammonium metavanadate (in V 2 o 5 Accounting for 2wt% of the total catalyst content) and 6.77g manganese acetate tetrahydrate (Mn(CH 3 COO) 2 4H 2 O) (as MnO 2 Accounting for 12wt% of the total catalyst content), fully stirred to obtain mixed metal salt solution; 17.2g gamma-Al 2 o 3 Add it into the mixed metal salt solution (accounting for 86wt% of the total catalyst content), stir for 2 hours, and then dry it at 140°C for 8 hours. mesh particles to obtain a loaded SCR denitrification catalyst for medium and low temperature flue gas, which is ready for use.

[0037] (2) Catalyst evaluation

[0038] The catalyst evaluation process is as in Example 1.

[0039] Catalyst evaluation results such as figure 1 Shown, in volume concentration [NO]=[NH 3 ]=0.1%, [O 2 ]=3%, air speed=6.6,000h -1 Under operating conditions, NO a...

Embodiment 3

[0041] (1) Catalyst preparation

[0042] First about 7g of oxalic acid (C 2 h 2 o 4 ·H 2 O) Dissolve in 25mL 80°C deionized water; add 0.65g ammonium metavanadate (in V 2 o 5 Accounting for 2.5wt% of the total catalyst content) and 3.04g iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O), 1.69g manganese acetate tetrahydrate (Mn(CH 3 COO) 2 4H 2 O) and 2.18g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) (as Fe 2 o 3 , MnO 2 and Co 3 o 4 Accounting for 9wt% of the total catalyst content), fully stirred to obtain mixed metal salt solution; 12g anatase TiO 2 and 5.7g γ-Al 2 o 3 Add it into the mixed metal salt solution (accounting for 88.5wt% of the total catalyst content), stir for 6 hours, and then dry it at 160°C for 12 hours. 80 mesh particles to obtain a loaded SCR denitrification catalyst for medium and low temperature flue gas, which is ready for use.

[0043] (2) Catalyst evaluation

[0044] The catalyst evaluation process is as in Example 1.

[0045...

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Abstract

The invention discloses a supported SCR denitration catalyst of medium and low temperature flue gas and a preparation method and application thereof. The catalyst comprises the following components: vanadium element, transition metal M and carrier. The addition of the vanadium element is 0.5-4wt% of the total mass of the catalyst by weight percent via calculating the amount of V2O5; the addition of the transition metal M is 1-14wt% of the total mass of the catalyst by weight percent via calculating the total amount of oxide; and the addition of the carrier is 80-98.5wt% of the total mass of the catalyst by weight percent. Compared with the widely used commercial catalyst, the catalyst of the invention reduces the cost by more than 30%, broadens the medium and low temperature ranges of SCR catalyst activity, and has the characteristics of simple preparation, low cost, high activity, strong sulfur poisoning resistance and the like.

Description

technical field [0001] The invention relates to a loaded SCR denitrification catalyst for medium and low temperature flue gas, its preparation method and application. 3 Selective catalytic reduction (SCR) of nitrogen oxides (NO x ) in the field of environmental catalysis. Background technique [0002] With the intensification of economic and social activities in our country, the problem of atmospheric environment is becoming more and more serious. Air pollutants mainly come from sulfur dioxide SO2 emitted from boilers and kilns 2 and nitrogen oxides NO x (NO, NO 2 and N 2 O, etc.), is the main component of acid rain and photochemical pollutants. At present, my country's flue gas desulfurization technology is relatively mature. By the end of 2008, the total thermal power installed capacity of desulfurization facilities in the country was 363 million kilowatts, forming an annual desulfurization capacity of about 10 million tons, accounting for 60.4% of the total thermal p...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/34B01J23/847B01J37/08B01D53/86B01D53/56
Inventor 岑超平陈志航唐志雄钟佩仪陈定盛方平
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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