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Denitration catalyst using rare earth and anion synergistically-modified titanium dioxide as carrier and preparation of catalyst

A synergistic modification, titanium dioxide technology, applied in the field of catalytic chemistry, can solve problems such as poor catalytic performance, achieve the effect of large high activity range, improve dispersibility, and avoid polymerization

Inactive Publication Date: 2019-08-20
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention makes the NO x and NH 3 It is easier to adsorb on the surface of the catalyst to participate in the reaction under medium and low temperature conditions, especially low temperature flue gas conditions, thereby improving the denitrification performance and sulfur and water resistance of the catalyst, broadening the high activity temperature range of the catalyst, prolonging the service life of the catalyst, and finally providing industrial boilers in non-electric industries. A high-efficiency removal of NO in flue gas conditions in a wide temperature range of 150-320 °C x The preparation formula and method of the novel SCR vanadium-based denitrification catalyst can especially solve the problem of poor catalytic performance at a lower temperature of 150-170°C

Method used

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  • Denitration catalyst using rare earth and anion synergistically-modified titanium dioxide as carrier and preparation of catalyst
  • Denitration catalyst using rare earth and anion synergistically-modified titanium dioxide as carrier and preparation of catalyst
  • Denitration catalyst using rare earth and anion synergistically-modified titanium dioxide as carrier and preparation of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1)CeO 2 and NH 4 F synergistically modified carrier TiO 2 preparation of

[0034] 1) Weigh 16g of industrial grade anatase TiO 2 Add 50ml deionized water, then add 0.5g NH 4 F and 1.4g CeO 2 , stirred at 50°C for 1.5 hours until it became viscous;

[0035] 2) Put the above viscous material into an oven, bake at 110°C for 3 hours, cool down to room temperature naturally, and grind it into powder;

[0036] 3) Put the ground powder into a muffle furnace, bake at 240°C for 2 hours, then bake at 450°C for 4 hours, take it out after cooling to room temperature, grind and sieve to 120 mesh.

[0037] (2) Loading of active components

[0038] 1) Weigh 1.5g of oxalic acid and dissolve it in 50ml of deionized water, stir and dissolve at 50°C, add 0.5g of ammonium metavanadate until it is completely dissolved into a blue clear solution. Then add 2g of ammonium tungstate and 0.3g of triammonium phosphate into the blue clear solution, and continue to stir at 50°C until compl...

example 2

[0044] (1)Ce(NO 3 ) 3 and NH 4 Cl Synergistically Modified Carrier TiO 2 preparation of

[0045] 1) Weigh 15.7g industrial grade anatase TiO 2 Add 50ml deionized water, then add 0.6g NH 4 Cl and 1.6g Ce(NO 3 ) 3 , stirred at 50°C for 1.5 hours until it became viscous;

[0046] 2) Put the above viscous material into an oven, bake at 110°C for 3 hours, cool down to room temperature naturally, and grind it into powder;

[0047] 3) Put the ground powder into a muffle furnace, bake at 240°C for 2 hours, then bake at 450°C for 4 hours, take it out after cooling to room temperature, grind and sieve to 120 mesh.

[0048] (2) Loading of active components

[0049] 1) Weigh 1.8g of oxalic acid and dissolve it in 50ml of deionized water, and stir to dissolve at 50°C, add 0.5g of ammonium metavanadate until completely dissolved to a blue clear solution. Then add 2g of ammonium tungstate and 0.3g of triammonium phosphate into the blue clear solution, and continue to stir at 50°C u...

example 3

[0055] (1)Y 2 o 3 and NH 4 Preparation of Br synergistically modified support

[0056] 1) Weigh 16.4g of industrial grade anatase TiO 2 Add 50ml deionized water, then add 0.5g NH 4 Br and 1.0 g Y 2 o 3 , stirred at 50°C for 1.5 hours until it became viscous;

[0057] 2) Put the above viscous material into an oven, bake at 110°C for 3 hours, cool down to room temperature naturally, and grind it into powder;

[0058] 3) Put the ground powder into a muffle furnace, bake at 240°C for 2 hours, then bake at 450°C for 4 hours, take it out after cooling to room temperature, grind and sieve to 120 mesh.

[0059] (2) Loading of active components

[0060] 1) Weigh 1.5g of oxalic acid and dissolve it in 50ml of deionized water, stir and dissolve at 50°C, add 0.5g of ammonium metavanadate until it is completely dissolved into a blue clear solution. Then add 2g of ammonium tungstate and 0.3g of triammonium phosphate into the blue clear solution, and continue to stir at 50°C until c...

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Abstract

The invention provides a denitration catalyst using rare earth and anion synergistically-modified titanium dioxide as a carrier and preparation of the catalyst, and belongs to the field of catalytic chemistry. The preparation method comprises the steps of performing synergistic modification on a titanium dioxide carrier by adopting a rare earth compound and anions, and supporting P2O5, V2O5 and WO3, wherein a precursor of the V2O5 is ammonium metavanadate, a precursor of the WO3 is ammonium tungstate, and a precursor of the P2O5 is triammonium phosphate. The catalyst provided by the inventionhas excellent medium and low temperature catalytic activity, and a large high-activity range; and under the temperature condition of 160-320 DEG C, the NOx removal rate is maintained at 95% or more, the N2 selectivity is higher than 98%, and the SO2 oxidation rate is lower than 1%.

Description

technical field [0001] The invention relates to a preparation formula and method of a novel medium and low temperature denitrification catalyst. The SCR catalyst is prepared by synergistically modifying the titanium dioxide carrier with rare earth compounds and anions, which can be used to remove non-electric catalysts such as coking, sintering, glass, cement, chemical industry, gas, and garbage incineration. NO in industrial flue gas x , belonging to the field of catalytic chemistry. Background technique [0002] NO in stationary source exhaust gas x The mainstream technology for governance is selective catalytic reduction (SCR). As the core of this technology—catalyst, it can be divided into noble metal catalysts, metal oxide catalysts, molecular sieve catalysts, carbon-based catalysts, clay-based catalysts, etc. according to the preparation raw materials. The most widely used catalyst system is V 2 o 5 -WO 3 / TiO 2 or V 2 o 5 -MoO 3 / TiO 2 Catalyst, where V 2 o...

Claims

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Application Information

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IPC IPC(8): B01J27/198B01J37/02B01D53/56B01D53/90
CPCB01D53/8628B01D53/90B01D2251/2062B01D2255/2061B01D2255/2065B01D2255/20707B01D2255/20723B01D2255/20776B01J27/198B01J37/0205
Inventor 李坚梁全明梁文俊李春晓
Owner BEIJING UNIV OF TECH
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