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Integral honeycombed catalyst for SCR flue-gas denitration and preparation method therefor

A honeycomb catalyst and monolithic technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. To achieve localization and other issues, to achieve the effect of increasing the contact area and catalyst strength, long service life, and improving catalytic performance

Active Publication Date: 2009-06-03
ZHONGCAI HIGH NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's flue gas denitrification technology mainly relies on the introduction of foreign technology, but the imported technology has prominent problems such as high technology usage fees, difficulty in mastering core technologies, and poor upgradeability. In particular, the catalyst used is expensive and has not been localized. These problems seriously restrict my country's NOx The development of governance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 1.641kg of ammonium tungstate according to the proportion, add 68g of oxalic acid into water to dissolve respectively, then add the oxalic acid solution into the ammonium tungstate aqueous solution, heat to 70°C, and fully stir in the reaction kettle for 30 minutes to dissolve; Titanic acid is 10.5kg of titanium dioxide nanopowder that raw material prepares, wherein SO 4 The root content is controlled at 5.1% (TiO 2 dry basis), bentonite 1.5kg, sepiolite 1.35kg, mix evenly, add the mixed carrier to the ammonium tungstate solution for impregnation, keep warm for 4 hours, stop heating, discharge the mixture from the outlet of the reactor, and dry Dry in a kiln at 105°C for 20 hours, roast in a kiln at 450°C for 4 hours, crush and sieve for later use.

[0041] Weigh 183g of ammonium metavanadate according to the proportion, add 197g of oxalic acid into water to dissolve respectively, then add the oxalic acid solution into the ammonium metavanadate aqueous solution, ...

Embodiment 2

[0045] The preparation was carried out according to the operation steps of Example 1, except that the ingredients were adjusted as follows: 12.9 kg of nano-titanium dioxide, 1.8 kg of bentonite, 1.2 kg of sepiolite, 366 g of ammonium metavanadate, and 394 g of oxalic acid. Other reagents, addition amount, operation process are all identical with embodiment 1. The overall strength of the catalyst is high, and the catalyst is crushed and sieved with 40 / 60 mesh, and the conversion rate of the catalyst used for flue gas denitrification is 95.7%.

Embodiment 3

[0047] The preparation was carried out according to the operation steps of Example 1, except that the batching composition was adjusted as follows: 11.5 kg of nano-titanium dioxide, 0.8 kg of bentonite, 0.6 kg of sepiolite, 732 g of ammonium metavanadate, and 788 g of oxalic acid. Other reagents, addition amount, operation process are all identical with embodiment 1. The overall strength of the catalyst is high, and the catalyst is crushed and sieved with 40 / 60 mesh, and the conversion rate of the catalyst for flue gas denitrification is 96.2%.

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Abstract

The invention relates to an integral honeycombed catalyst for SCR flue-gas denitration and a preparation method therefor. Titanium dioxide, bentonite and meerschaum are taken as carries, soaked for loading active components, formed, dried and baked to prepare the integral honeycombed catalyst. The carries comprise titanium dioxide 60-90%, bentonite 0-20% and meerschaum 0-10% by weight; the active components comprise WO3 5.0-10.0% OR MoO3 5.0-9.0%, V2O5 0.3-5.0%, and CeO2 0.0-2.0% or Nb2O5 0.0-1.0% by weight; and the total of the components is 100%. The catalytic activity is high, the denitration efficiency is high, and the service life is long; titanium dioxide, bentonite and meerschaum are taken as the carries, soaked for loading the active components, formed, dried and baked to prepare the integral honeycombed catalyst; and the preparation method is scientific, reasonable, simple and feasible.

Description

technical field [0001] The invention relates to an integral honeycomb catalyst for SCR flue gas denitrification and a preparation method thereof, which are used for the treatment of air pollution. Background technique [0002] Nitrogen oxides (including NO, NO 2 , referred to as NOx) is one of the most important air pollutants today, and the acid rain and photochemical smog caused by it have a serious impact on soil and water ecosystems; in addition, NOx can also cause greenhouses and promote O 3 converted to O 2 , destroy the ozone layer. Nitrogen oxides not only damage the environment, but also directly endanger human health. Most of NOx is produced by the oxidation of nitrogen in fuel and air during high temperature combustion. [0003] At present, among various denitrification technologies at home and abroad, Selective Catalytic Reduction (SCR) denitrification technology is one of the most widely used, most efficient and most mature technologies. SCR denitrification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/16B01J23/10B01J35/04B01D53/56
Inventor 张纯彦代丽丽吴庆祝于宁王庆庆赵艳军张慧欣
Owner ZHONGCAI HIGH NEW MATERIAL
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