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Load type low-temperature anti-ammonium bisulfate SCR denitration catalyst as well as preparation method and application thereof

A technology of SCR catalyst and denitration catalyst, which is applied in the field of loaded low-temperature anti-ammonium bisulfate SCR denitration catalyst and its preparation, can solve the problems of poisoning, loss of catalytic activity, etc., and achieve the effect of simple preparation method and low denitrification efficiency

Inactive Publication Date: 2017-12-22
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese invention patent with publication number CN102078809 A discloses a low-temperature denitrification Mn-Ti catalyst suitable for 150-250 °C, but MnO x easy to be SO 3 and H 2 H from O 2 SO 4 poisoning, loss of catalytic activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Preparation of catalyst: Add 0.2 mol ammonium metavanadate (NH4VO 3 ), 0.48 mol dihydrate oxalic acid (H 2 C 2 o 4 2H 2 O), stirred at 60°C for 0.5 h to obtain a blue solution. Add 0.11 mol ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 4H 2 O), stirred for 0.5 h; added 0.31 mol of H to the above solution 3 PO 4 (85%), continue to stir for 3 h until the reaction is complete; add 500 g of TiO with high specific surface area to the solution 2 , ultrasonically dispersed, stirred and evaporated to dryness at 90°C; the obtained sample was transferred to a vacuum drying oven, maintained at a vacuum of -0.07 MPa, and dried at a constant temperature of 120°C for 12 h. The solid was ground to no particles and then baked in a muffle furnace at 700 °C for 6 h. Granulate and pass through a 40-60 mesh sieve to obtain a low-temperature load-resistant ammonium bisulfate-resistant SCR catalyst.

[0024] 2. Catalyst performance test: Take 0.6 g of the catalyst tha...

Embodiment 2

[0027] 1. Preparation of catalyst: Add 0.2 mol ammonium metavanadate (NH4VO 3 ), 0.48 mol dihydrate oxalic acid (H 2 C 2 o 4 2H 2 O), stirred at 60°C for 0.5 h to obtain a blue solution. Add 0.067 mol ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 .nH 2 O), stirred for 0.5 h; added 0.31 mol of H to the above solution 3 PO 4 (85%), continue to stir for 3 h until the reaction is complete; add 500 g of TiO with high specific surface area to the solution 2 , ultrasonically dispersed, stirred and evaporated to dryness at 90°C; the obtained sample was transferred to a vacuum drying oven, maintained at a vacuum of -0.07 MPa, and dried at a constant temperature of 120°C for 12 h. The solid was ground to no particles and then baked in a muffle furnace at 700 °C for 6 h. Granulate and pass through a 40-60 mesh sieve to obtain a low-temperature load-resistant ammonium bisulfate-resistant SCR catalyst.

[0028]2. Catalyst performance test: Take 0.6 g of the catalyst that h...

Embodiment 3

[0031] 1. Catalyst preparation: Add 0.1 mol vanadium pentoxide (V 2 o 5 ), 0.48 mol dihydrate oxalic acid (H 2 C 2 o 4 2H 2 O), stirred at 60°C for 0.5 h to obtain an orange suspension. Add 0.11 mol ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 4H 2 O), stirred for 0.5 h; added 0.31 mol of H to the above solution 3 PO 4 (85%), continue to stir for 3 h until the reaction is complete; add 500 g of TiO with high specific surface area to the solution 2 , ultrasonically dispersed, stirred and evaporated to dryness at 90°C; the obtained sample was transferred to a vacuum drying oven, maintained at a vacuum of -0.07 MPa, and dried at a constant temperature of 120°C for 12 hours. The solid was ground to no particles and then baked in a muffle furnace at 700 °C for 6 h. Granulate and pass through a 40-60 mesh sieve to obtain a low-temperature load-resistant ammonium bisulfate-resistant SCR catalyst.

[0032] 2. Catalyst performance test: Take 0.6 g of the catalyst ...

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Abstract

The invention belongs to the technical field of air pollution control and particularly relates to a load type low-temperature anti-ammonium bisulfate SCR denitration catalyst as well as a preparation method and application thereof. The anti-ammonium bisulfate SCR denitration catalyst has a general formula of MxV1-xOPO4 / TiO2, wherein M is Mo or W; the sum of molar numbers of M and V is 1; and an active component is 1-10 parts by weight, and a carrier is 90-99 parts by weight. The denitration catalyst is prepared by adopting an impregnation method, so that the defects of high living temperature, narrower temperature window, low low-temperature denitrification efficiency, weak resistance to sulfur and water, and the like of traditional V2O5-WO3 / TiO2 are effectively overcome. The catalyst provided by the invention can tolerate nitrogen oxide flue gas containing SO2 of 0-3000 mg / m<3> and water vapor of 0-20 percent by volume; under the conditions of 150-300 DEG C and 3000-100,000 h<-1> airspeed, the denitrification efficiency is greater than 90 percent and can be stabilized for above 80 h; and the catalyst can be used for the nitrogen oxide emission control for flue gas from glass, steels and irons, coking coke ovens and other stationary sources.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a loaded low-temperature anti-ammonium bisulfate SCR denitration catalyst and a preparation method and application thereof. Background technique [0002] Nitrogen oxide NO x Yes (NO, NO 2 and N 2 O) One of the main sources of global air pollutants is one of the main causes of environmental problems such as photochemical smog, acid rain, smog, and ozone layer destruction. one of the environmental problems. my country's coal-based energy structure has resulted in a large amount of NO in flue gas from thermal power stations, steel, metallurgy, glass, petrochemical, coking and coke ovens, etc. x . In recent years, my country's environmental protection standards have been continuously improved, and the emission control of nitrogen oxides has become more and more stringent. Most of the coal-fired power plants have carried out the transformation of denitri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/199B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J27/199
Inventor 唐幸福刘小娜高佳逸陈俊逍
Owner FUDAN UNIV
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