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Composite oxidant SCR (Selective Catalytic Reduction) denitrating catalyst, preparation method and applications thereof

A technology of composite oxides and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of reducing catalyst activity and life, corroding pipeline equipment, increasing Operating costs and other issues, to achieve the effect of cost reduction, low cost, strong resistance to sulfur poisoning

Active Publication Date: 2010-09-15
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the whole, SCR catalysts have high manufacturing costs, such as active components such as W, Mo, Pt, and Ce, which are relatively expensive. The commonly used V 2 o 5 Not only a toxic substance, but also 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 Severely corroded pipeline equipment, increasing operating costs
Therefore, the above SCR catalysts still have certain limitations.

Method used

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  • Composite oxidant SCR (Selective Catalytic Reduction) denitrating catalyst, preparation method and applications thereof
  • Composite oxidant SCR (Selective Catalytic Reduction) denitrating catalyst, preparation method and applications thereof
  • Composite oxidant SCR (Selective Catalytic Reduction) denitrating catalyst, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028](1) Catalyst preparation

[0029] First, 6.0g citric acid (C 6 h 8 o 7 ) was dissolved in 30mL 30℃ deionized water; 6.08g ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and 4.67g nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) (as Fe 2 o 3 and NiO account for 12.0wt% of the total catalyst content), fully stirred for 1h to obtain a mixed metal salt solution; 44.65g titanium tetrachloride (TiCl 4 ) was slowly added to the mixed metal salt solution (with TiO 2 accounted for 88.0wt% of the total catalyst content), stirred for 2 hours, dried at 100°C for 36 hours, and the obtained solid was calcined at 750°C for 5 hours under air conditions, then pressed into tablets and ground to make 40-80 mesh particles to obtain Composite oxide SCR denitrification catalyst for boiler medium temperature flue gas, spare.

[0030] (2) Catalyst evaluation

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

Embodiment 2

[0035] (1) Catalyst preparation

[0036] First, 8.1g oxalic acid (C 2 h 2 o 4 2H 2 O) was dissolved in 40 mL of 70°C deionized water; 3.64 g of copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O) and 4.23g manganese acetate tetrahydrate (Mn(CH 3 COO) 2 4H 2 O) (with CuO and MnO 2 Accounting for 13.5wt% of the total catalyst content), fully stirred for 1h to obtain a mixed metal salt solution; 73.72g tetrabutyl titanate (Ti(OC 4 h 9 ) 4 ) was slowly added to the mixed metal salt solution (with TiO 2 accounted for 86.5wt% of the total catalyst content), stirred for 3 hours, dried at 120°C for 24h, and the obtained solid was calcined at 700°C for 6h under air conditions, then pressed into tablets and ground to form 40-80 mesh particles to obtain Composite oxide SCR denitrification catalyst for boiler medium temperature flue gas, spare.

[0037] (2) Catalyst evaluation

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

[0039] Catalyst evaluation results suc...

Embodiment 3

[0041] (1) Catalyst preparation

[0042] First, 9.0g citric acid (C 6 h 8 o 7 ) was dissolved in 40mL of 50°C deionized water; 5.06g of iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O), 2.43g copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O) and 2.82g manganese acetate tetrahydrate (Mn(CH 3 COO) 2 4H 2 O) (as Fe 2 o 3 , CuO and MnO 2 Accounting for 14.0wt% of the total catalyst content), fully stirred for 1.5h to obtain mixed metal salt solution; 40.85g titanium tetrachloride (TiCl 4 ) was slowly added to the mixed metal salt solution (accounting for 86.0wt% of the total catalyst content), stirred for 4 hours, dried at 160°C for 12 hours, and the obtained solid was calcined at 550°C for 8 hours under air conditions, then pressed into tablets and ground to produce 40-80 mesh particles to obtain a composite oxide SCR denitrification catalyst for boiler medium-temperature flue gas, which is ready for use.

[0043] (2) Catalyst evaluation

[0044] The catalyst evaluatio...

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PUM

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Abstract

The invention discloses a composite oxidant SCR (Selective Catalytic Reduction) denitrating catalyst for warm fume in boilers, a preparation method and application thereof. The catalyst comprises the components of transition metal element M and Ti element. As counted by the oxidant, the amount of the transition metal element M accounts for 6.8-20wt% of the total weight of the catalyst. As counted by TiO2, the amount of Ti accounts for 80-93.2wt% of the total weight of the catalyst. Compared with the widely used commercial catalyst, the catalyst decreases the cost by more than 20%, does not contain W, Mo, V and Ce, and has the advantages of low cost, no toxicity, high activity, good sulphate resisting property and the like.

Description

technical field [0001] The invention relates to a composite oxide catalyst for boiler flue gas denitrification and its preparation method and application. The composite oxide catalyst is applied to NH 3 Selective catalytic reduction of nitrogen oxides (NO x ) in the field of environmental catalysis. Background technique [0002] Sulfur dioxide SO emitted from boiler flue gas 2 and nitrogen oxides NO x (NO, NO 2 and N 2 O, etc.), is one of the main causes of acid rain and photochemical pollutants, resulting in increasingly serious atmospheric environmental problems. At present, my country's flue gas desulfurization technology is relatively mature. By the end of 2008, the country has formed an annual desulfurization capacity of about 10 million tons. However, the emission control of nitrogen oxides is still in its infancy. In 2008, the total emission of nitrogen oxides in the country was about 20 million tons, becoming the world's largest emitter. If no effective measure...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/889B01D53/86B01D53/56
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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