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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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

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

Example Embodiment

[0027] Example 1

[0028] (1) Catalyst preparation

[0029] First, 4g oxalic acid (C 2 H 2 O 4 ·H 2 O) Dissolve in 20mL 60℃ deionized water; add 0.51g ammonium metavanadate (in V 2 O 5 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 Totally accounting for 8wt% of the total content of the catalyst), fully stirred to obtain a mixed metal salt solution; 18g anatase TiO 2 Add to the mixed metal salt solution (accounting for 90wt% of the total catalyst content), stir for 4h, dry at 90℃ for 24h, and calcinate the obtained solid at 600℃ for 6h under air condition, then press and grind to make 40~80 Target particles are obtained to obtain a supported SCR denitration catalyst for medium and low temperature flue gas, which is reserved.

[0030] (2) Catalyst evaluation

[0031] Put the catalyst obtained above into a stainless steel reaction tube, and use a program t...

Example Embodiment

[0034] Example 2

[0035] (1) Catalyst preparation

[0036] First, about 3g of oxalic acid (C 2 H 2 O 4 ·H 2 O) Dissolve in 20mL of 50℃ deionized water; add 0.26g of ammonium metavanadate (in V 2 O 5 2wt% of the total catalyst content) and 6.77g manganese acetate tetrahydrate (Mn(CH 3 COO) 2 ·4H 2 O) (in MnO 2 (Accounting for 12wt% of the total content of the catalyst), fully stirred to obtain a mixed metal salt solution; 17.2g γ-Al 2 O 3 Add to the mixed metal salt solution (86wt% of the total catalyst content), stir for 2h, then dry at 140℃ for 8h, the solid obtained is calcined at 700℃ under air condition for 6h, then pressed and ground to make 40~80 Target particles are obtained to obtain a supported SCR denitration catalyst for medium and low temperature flue gas, which is reserved.

[0037] (2) Catalyst evaluation

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

[0039] The catalyst evaluation results are as figure 1 As shown in the volume concentration [NO] = [NH 3 ...

Example Embodiment

[0040] Example 3

[0041] (1) Catalyst preparation

[0042] First, about 7g of oxalic acid (C 2 H 2 O 4 ·H 2 O) Dissolve in 25mL of 80℃ deionized water; add 0.65g of ammonium metavanadate (in V 2 O 5 2.5wt% of the total catalyst content) and 3.04g nonahydrate iron nitrate (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) (with Fe 2 O 3 , MnO 2 And Co 3 O 4 Totally accounting for 9wt% of the total content of the catalyst), fully stirred to obtain a mixed metal salt solution; 12g anatase TiO 2 And 5.7g γ-Al 2 O 3 Add to the mixed metal salt solution (88.5wt% of the total catalyst content), stir for 6h, dry at 160°C for 12h, and calcinate the solid at 670°C for 8h under air conditions, then press and grind to make 40~ 80 mesh particles are used to obtain a supported SCR denitration catalyst for medium and low temperature flue gas, which is reserved.

[0043] (2) Catalyst evaluation

[0044] The ...

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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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