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Combined SCR (selective catalytic reduction) denitration catalyst with strong anti-poisoning capability and application of catalyst

A technology of denitration catalyst and combined catalyst, which is applied in the field of combined SCR denitration catalyst, can solve the problems of poor water resistance, sulfur resistance, weak alkali resistance and arsenic resistance, narrow operating temperature window, etc. Good industrial application value, high efficiency nitrogen oxide effect

Inactive Publication Date: 2018-08-24
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although V 2 o 5 -WO 3 / TiO 2 The catalyst has high denitrification efficiency and anti-SO 2 It has the advantages of strong poisoning ability and has been widely used in flue gas denitrification, but there are still many shortcomings in this catalyst system: it contains toxic substances V 2 o 5 , if V occurs during use 2 o 5 It falls off and is biologically toxic when it enters the environment; the operating temperature window is narrow, and a large amount of greenhouse gas N is generated at high temperature 2 O; easy sintering at high temperature, poor thermal stability; weak alkali and arsenic resistance; high price of vanadium and tungsten (ammonium paratungstate is 110,000 yuan / ton, ammonium metavanadate is 80,000 yuan / ton) and other shortcomings
However, most of these non-vanadium-based SCR denitrification catalysts show high denitrification ability only under the condition of no sulfur and no water, and the resistance to water and sulfur will deteriorate after long-term use.

Method used

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  • Combined SCR (selective catalytic reduction) denitration catalyst with strong anti-poisoning capability and application of catalyst
  • Combined SCR (selective catalytic reduction) denitration catalyst with strong anti-poisoning capability and application of catalyst
  • Combined SCR (selective catalytic reduction) denitration catalyst with strong anti-poisoning capability and application of catalyst

Examples

Experimental program
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Effect test

preparation example Construction

[0046] The catalyst was prepared by a stepwise impregnation method, that is, the TiO 2 surface loading WO 3 Then load V 2 o 5 , making V 2 o 5 -WO 3 / TiO 2 Catalyst, the impregnating solution is ammonium metavanadate and ammonium paratungstate aqueous solution, and a certain amount of oxalic acid is added during the preparation process to help the dissolution. TiO 2 The powder is heated to 60-70°C in ammonium paratungstate solution and stirred for 4 hours, then dried in an oven at 105°C for 12 hours, roasted in a muffle furnace at 500°C for 5 hours, and the roasted product is cooled and crushed and then heated to 60- Stir at 70°C for 4 hours, dry in an oven at 105°C for 12 hours, and bake in a muffle furnace at 500°C for 5 hours. After the product is cooled, crush and sieve it into 40-60 mesh V 2 o 5 -WO 3 / TiO 2 catalyst. The V 2 o 5 -WO 3 / TiO 2 Catalyst, V 2 o 5 The content is 0.5%~2%, WO 3 The content is 3-8%.

[0047] Combination and activity evaluatio...

Embodiment 1

[0055] Weigh 6.20g of cerous nitrate and dissolve it, pour it into 1.40g of phosphoric acid, stir, then add 8.57g of urea to the solution, after the urea is completely dissolved, add 10.0g of TiO 2 Carrier, then began to heat up to 95°C, stirred and evaporated the solution to dryness, then dried in an oven at 110°C for 12 hours, and finally baked at 500°C for 5 hours. After the product was cooled, it was crushed and sieved into CePO / TiO 2 Catalyst, wherein the Ce content is the carrier TiO 2 20% of the mass, Ce:P (molar ratio) is 1:1.

[0056] Weigh 1.0g of oxalic acid and add it into the aqueous solution containing 0.55g of ammonium paratungstate, stir to dissolve, and mix 10.0g of TiO 2 The powder is heated to 60-70°C in the ammonium paratungstate solution and stirred for 4 hours, then dried in an oven at 105°C for 12 hours, roasted in a muffle furnace at 500°C for 5 hours, and the roasted product is cooled and crushed in an aqueous solution containing 0.13g of ammonium m...

Embodiment 2

[0059] The staged catalyst preparation method is the same as in Example 1.

[0060] The prepared two catalysts are divided into upper and lower catalyst beds and loaded in the constant temperature section of the reactor. The two-layer catalyst loading method is CePO / TiO 2 On top (air intake), V 2 o 5 -WO 3 / TiO 2 Under (gas outlet), CePO / TiO 2 and V 2 o 5 -WO 3 / TiO 2 The mass ratio is 1:2. Catalyst activity evaluation means is the same as embodiment 1, NO x The conversion rate is detailed in Table 1.

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Abstract

The invention relates to a combined SCR (selective catalytic reduction) denitration catalyst with strong anti-poisoning capability and an application of the catalyst and belongs to the technical fieldof air pollution treatment. The combined SCR denitration catalyst with the strong anti-poisoning capability is a two-stage combined catalyst and comprises CePO / TiO2 and V2O5-WO3 / TiO2, wherein CePO and V2O5-WO3 are active components; TiO2 is a carrier and is a anatase crystal form; and a mass ratio of CePO / TiO2 to V2O5-WO3 / TiO2 is 3:1-1:3. Compared with the traditional vanadium-tungsten-titanium catalyst, the optimized combined catalyst can efficiently remove nitric oxide in a wider temperature interval and has stronger alkali resistance and anti-arsenic poisoning capability at the same time;the preparation cost of the denitration catalyst can be reduced; and the catalyst has a better industrial application value. The two-stage combined catalyst is also used for purifying nitric oxide intail gas of fixed combustion devices such as various coal-fired power plants and boilers as an integral SCR denitration catalyst, and has the better industrial application value.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a combined SCR denitrification catalyst with strong anti-poisoning ability and an application thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants of air pollution. A large amount of its discharge can not only form acid rain, but also combine with hydrocarbons to form photochemical smog, which brings serious harm to the natural environment and human production activities. Nitrogen oxide pollution in my country is very serious. In 2012, my country's total nitrogen oxide emissions reached 23.378 million tons. Among them, about 70% comes from the direct combustion of coal, and coal-fired emissions from thermal power plants account for about 50% of the total coal-fired emissions. If effective control measures are not taken, my country's NO x Emissions will reach 30 million tons in 2020. Therefore, the work of elim...

Claims

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Application Information

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IPC IPC(8): B01J27/18B01J23/30B01D53/86B01D53/56
CPCB01D53/8628B01D2258/06B01J23/002B01J23/30B01J27/1804B01J2523/00B01J2523/47B01J2523/56B01J2523/69Y02A50/20
Inventor 杨向光张一波张兴文易婷孙立伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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