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Regeneration method for waste vanadium-titanium-based SCR (Selective Catalytic Reduction) flue gas denitrification catalyst

A denitration catalyst, vanadium-titanium-based technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low utilization rate of waste catalysts, secondary pollution, The strength of the regenerated catalyst is not high, and it achieves the effects of good sulfur resistance and water poisoning resistance, high utilization rate, and wide active temperature window.

Active Publication Date: 2014-06-25
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a waste vanadium-titanium-based SCR flue gas denitrification with simple process, low cost and low environmental pressure in order to improve the secondary pollution of the existing regeneration process, the strength of the regenerated catalyst is not high, and the utilization rate of the waste catalyst is low. Catalyst regeneration method

Method used

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  • Regeneration method for waste vanadium-titanium-based SCR (Selective Catalytic Reduction) flue gas denitrification catalyst
  • Regeneration method for waste vanadium-titanium-based SCR (Selective Catalytic Reduction) flue gas denitrification catalyst

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Experimental program
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Effect test

Embodiment 1

[0028] Specific steps:

[0029] (1) Blow the waste vanadium-titanium-based SCR flue gas denitrification catalyst with 0.8MPa oil-free dry compressed air for 50 minutes, put it in a ball mill tank, and then put it on a planetary ball mill with a material: agate ball mass ratio of 1:3 Ball milling for 1 hour to prepare waste vanadium-titanium-based SCR flue gas denitrification catalyst recycle material;

[0030](2) Mix ammonium sulfate, kaolin and waste vanadium-titanium-based SCR flue gas denitrification catalyst reclaimed material at a mass ratio of 0.5:9.5:90 (without adding metal oxides), and then use the mixture: agate ball: poly The mass ratio of acrylic acid: water is 1:2.5:0.5%:1, ball milled on a planetary ball mill for 15 hours, and then dried at 110°C for 24 hours to prepare the regenerated SCR flue gas denitrification catalyst powder;

[0031] (3) Mix the regenerated SCR flue gas denitrification catalyst powder with hydroxypropyl methylcellulose, glycerin, and water...

Embodiment 2

[0038] Specific steps:

[0039] (1) The waste vanadium-titanium-based SCR flue gas denitrification catalyst was purged with 0.1MPa oil-free dry compressed air for 60 minutes, then placed in a ball mill tank, and then placed on a planetary ball mill with a material: agate ball mass ratio of 1:2 Ball milled for 1.5h to prepare waste vanadium-titanium-based SCR flue gas denitrification catalyst reclaimed material;

[0040] (2) Mix cobalt oxide, ammonium phosphate, kaolin, bentonite, and waste vanadium-titanium-based SCR flue gas denitrification catalyst reclaimed materials in a mass ratio of 15:2:10:30:43, and then use the mixture: agate balls The mass ratio of acrylamide: water is 1:2:2%:0.7, ball milled on a planetary ball mill for 16 hours, and then dried at 90°C for 24 hours to prepare the regenerated SCR flue gas denitrification catalyst powder;

[0041] (3) Mix the regenerated SCR flue gas denitrification catalyst powder with polyvinyl alcohol, tung oil, and water in a mas...

Embodiment 3

[0048] Specific steps:

[0049] (1) Blow the waste vanadium-titanium-based SCR flue gas denitrification catalyst with 1MPa oil-free dry compressed air for 20 minutes, put it in a ball mill tank, and then ball mill it on a planetary ball mill with a mass ratio of material: agate ball equal to 1:3 0.5h, the waste vanadium-titanium-based SCR flue gas denitration catalyst reclaimed material was prepared;

[0050] (2) Mix cerium oxide, lanthanum oxide, cobalt oxide, diammonium hydrogen phosphate, quartz sand, and waste vanadium-titanium-based SCR flue gas denitrification catalyst reclaimed material in a mass ratio of 1:1:13:0.3:28:56.7 material, and then ball milled on a planetary ball mill for 6 hours with the mass ratio of mixture: agate ball: acrylamide: ethanolamine: water: 1:3:1%:0.5%:0.5, and then dried at 120°C for 12 hours to prepare Regenerated SCR flue gas denitrification catalyst powder;

[0051] (3) Mix the regenerated SCR flue gas denitrification catalyst powder with...

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Abstract

The invention relates to a regeneration method for a waste vanadium-titanium-based SCR (Selective Catalytic Reduction) flue gas denitrification catalyst, comprising the following concrete steps of: (1) purging the waste vanadium-titanium-based SCR flue gas denitrification catalyst and ball-milling the purged waste vanadium-titanium-based SCR flue gas denitrification catalyst to obtain a reclaimed material of the waste vanadium-titanium-based SCR flue gas denitrification catalyst; (2) mixing a metal oxide, an assistant, an inorganic additive and the reclaimed material of the waste vanadium-titanium-based SCR flue gas denitrification catalyst, ball-milling and drying to obtain regenerated SCR flue gas denitrification catalyst powder; (3) adding a proper amount of binder, lubricating agent and water into the regenerated SCR flue gas denitrification catalyst powder to be uniform, then, pelleting, pugging, ageing and carrying out extrusion molding to obtain a regenerated SCR flue gas denitrification catalyst green body; and (4) drying and calcining the green body to obtain a regenerated SCR flue gas denitrification catalyst. The regeneration method provided by the invention is simple in process, low in cost and low in environment pressure. The regenerated SCR flue gas denitrification catalyst is higher in denitrification activity, wider in activity temperature window, better in sulfur and water intoxication resistance and higher in mechanical strength.

Description

technical field [0001] The invention relates to a method for regenerating a waste catalyst, in particular to a method for regenerating a waste vanadium-titanium-based SCR flue gas denitrification catalyst, and belongs to the fields of air pollution prevention and environmental protection. Background technique [0002] In 2011, my country's NOx emissions reached 24 million tons, making it the world's largest NOx emitter. Nitrogen oxides (NO X ) is the national "Twelfth Five-Year Plan" emission reduction focus. In its control technology, the selective catalytic reduction (NH 3 -SCR) technology accounts for 96% due to its maturity and reliability. Commercial denitrification catalyst V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 The optimum active temperature window is 310-410°C, and the service life is 3-5 years; it is predicted that after 2015, the annual waste of SCR denitrification catalysts will be as high as 120,000-150,000 cubic meters. The discarding of the catalyst directly aff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/92B01J23/22B01J23/847
Inventor 祝社民陈朗沈岳松沈树宝
Owner NANJING TECH UNIV