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Middle and low temperature SCR denitration catalyst with anti-poisoning performance, and preparation method thereof

A denitration catalyst and anti-poisoning technology, which can be used in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Achieve high activity, extended service life, reduced clogging and toxicity

Active Publication Date: 2014-08-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for small industrial boilers, gas boilers, gas turbines, cracking furnaces, nitric acid plants, oil refineries, and waste incineration plants, etc., the temperature of the flue gas after the use of waste heat is lower than 300°C. If the high-temperature SCR denitrification technology is forcibly applied, it will face Space and piping constraints, waste heat boiler and fan system retrofit issues

Method used

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  • Middle and low temperature SCR denitration catalyst with anti-poisoning performance, and preparation method thereof
  • Middle and low temperature SCR denitration catalyst with anti-poisoning performance, and preparation method thereof
  • Middle and low temperature SCR denitration catalyst with anti-poisoning performance, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Calcining transition metal salt cerium nitrate hexahydrate in an air atmosphere at 450°C for 2 hours to prepare cerium oxide;

[0038] 2) Put 50g of cerium oxide and 50g of phosphotungstic acid into a planetary ball mill after mixing, and rotate and grind at a speed of 180r / min for 10 hours to obtain an intermediate;

[0039] 3) Calcining the obtained intermediate at a temperature of 80° C. for 1 hour to obtain a medium-low temperature SCR denitrification catalyst with anti-sulfur and anti-poisoning properties of alkali metals and alkaline earth metals.

[0040] Catalyst activity test:

[0041] Put the prepared catalyst into a fixed-bed quartz tube reactor, and feed it with N 2 , O 2 , NO and NH 3 Composed of simulated flue gas for testing, where [NO]=600ppm, [NH 3 ]=600ppm, [O 2 ]=3%, the reaction temperature is 200~500℃, and the space velocity is 40000h -1 Under certain conditions, the denitrification efficiency is stable above 90%.

[0042] The test reactio...

Embodiment 2

[0051] 1) Calcining transition metal salt cobalt carbonate in an air atmosphere at 500°C for 2 hours to obtain cobalt oxide;

[0052] 2) Mix 50g of cobalt oxide and 50g of phosphotungstic acid into a planetary ball mill, and rotate and grind at a speed of 180r / min for 10 hours to obtain an intermediate;

[0053] 3) Calcining the obtained intermediate at a temperature of 80° C. for 1 hour to obtain a medium-low temperature SCR denitrification catalyst with anti-sulfur and anti-poisoning properties of alkali metals and alkaline earth metals.

[0054] Catalyst activity test:

[0055] Put the prepared catalyst into a fixed-bed quartz tube reactor, and feed it with N 2 , O 2 , NO and NH 3 Composed of simulated flue gas for testing, where [NO]=600ppm, [NH 3 ]=600ppm, [O 2 ]=3%, the reaction temperature is 200~500℃, and the space velocity is 40000h -1 Under certain conditions, the denitrification efficiency is stable above 90%.

[0056] The test reaction temperature is specifi...

Embodiment 3

[0065] 1) Calcining transition metal salt vanadium nitrate in an air atmosphere at 450°C for 7 hours to obtain vanadium oxide;

[0066] 2) Mix 50g of vanadium oxide and 50g of phosphotungstic acid into a planetary ball mill, and rotate and grind at a speed of 180r / min for 10 hours to obtain an intermediate;

[0067] 3) Calcining the obtained intermediate at a temperature of 80° C. for 1 hour to obtain a medium-low temperature SCR denitrification catalyst with anti-sulfur and anti-poisoning properties of alkali metals and alkaline earth metals.

[0068] Catalyst activity test:

[0069] Put the prepared catalyst into a fixed-bed quartz tube reactor, and feed it with N 2 , O 2 , NO and NH 3 Composed of simulated flue gas for testing, where [NO]=600ppm, [NH 3 ]=600ppm, [O 2 ]=3%, the reaction temperature is 200~500℃, the space velocity is 40000h -1 Under certain conditions, the denitrification efficiency is stable above 90%.

[0070] The test reaction temperature is specifi...

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Abstract

The invention discloses a middle and low temperature SCR denitration catalyst with an anti-poisoning performance. The invention also discloses a preparation method of the middle and low temperature SCR denitration catalyst with an anti-poisoning performance. The preparation method comprises the following steps: 1, calcining a transition metal salt at 400-700DEG C for 1-10h to obtain a transition metal oxide; 2, mixing heteropoly acid or heteropoly salt with the prepared transition metal oxide according to a mass ratio of 1:(0.1-1), and carrying out dry mixing grinding to obtain an intermediate, wherein the heteropoly acid is phosphotungstic acid or phosphomolybdic acid, and the heteropoly salt is corresponding B salt of phosphotungstic acid or phosphomolybdic acid; and 3, calcining the intermediate obtained in step 2 at 80-500DEG C to obtain a finished product. The catalyst has an excellent middle and low temperature denitration performance, has a very excellent anti-poisoning ability on SO2, alkali metals and alkaline earth metals, and has unique advantages in the treatment of exhaust gases with high content of the alkali metals or alkaline earth metals, comprising cement kiln tail gas, biomass fuel boiler flue gas and the like.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a preparation method and product of a medium-low temperature SCR denitrification catalyst with anti-poisoning performance. Background technique [0002] At present, my country's air pollution is undergoing a transition from coal-burning to complex pollution. Various problems such as photochemical smog, haze, and acid deposition coexist. Environmental problems are becoming more and more complicated. The concentration of precursors has been rising steadily, and the pollution of fine particles formed by their transformation has been increasing, the visibility of the atmosphere has dropped sharply, and haze events have occurred frequently. Since the "Tenth Five-Year Plan", with the construction of desulfurization facilities in my country's power plants, the effect of sulfur dioxide control has begun to appear, and SO in acid rain 4 2- / NO 3- The equivalence ratio of t...

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J31/36B01J31/28B01D53/90B01D53/56
Inventor 吴忠标田青青翁小乐刘越王海强
Owner ZHEJIANG UNIV
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