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Low-temperature, sulfur-resistant phosphorus-containing cerium-iron-tin composite denitrification catalyst and preparation method thereof

A denitrification catalyst, ferrocerium technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of catalyst deactivation, low-temperature denitrification efficiency, poor catalytic activity, etc., and achieve simple preparation methods, Excellent low-temperature catalytic activity and reduced production cost

Active Publication Date: 2021-05-07
THE NORTHWEST RES INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101642715A discloses a cerium pyrophosphate catalyst for selective catalytic reduction of nitrogen oxides. Although the catalyst has high denitrification efficiency above 350°C, its catalytic activity is relatively poor below 350°C.
The invention patent with application publication number 108031482A discloses a cerium phosphate-based denitrification catalyst prepared by hydrothermal synthesis method with cerium phosphate as the main component and manganese oxide and tin oxide as auxiliary components. The temperature range of the catalyst is 300°C The denitrification efficiency reaches over 85% at ~500°C, but its low temperature denitrification efficiency is low, and the catalyst is rapidly deactivated in the presence of sulfur dioxide

Method used

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  • Low-temperature, sulfur-resistant phosphorus-containing cerium-iron-tin composite denitrification catalyst and preparation method thereof
  • Low-temperature, sulfur-resistant phosphorus-containing cerium-iron-tin composite denitrification catalyst and preparation method thereof
  • Low-temperature, sulfur-resistant phosphorus-containing cerium-iron-tin composite denitrification catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023]The phosphorus-containing tin composite denitrification catalyst containing cerium is composed of a phosphate, iron oxide and tin oxide, and the mass ratio of iron oxide and tin oxide is 1: 0.2: 0.03; The nitrogen oxide conversion of the phosphorus-containing iron-containing iron-containing composite denitration catalyst at a temperature condition of 150 ° C to 350 ° C reaches 90% or more.

[0024]The preparation method of the phosphorus-containing tin composite denitrifination catalyst containing the present embodiment includes the steps of:

[0025]Step 1, 6.51 g of six-water nitrate is dissolved in 100 g of deionized water, then mixed into aqueous pyrophosphate aqueous solution, mixed well, to obtain a mixed solution A; the aqueous pyrophosphate solution is dissolved from 0.89 g of pyrophosphate in 100 g of water formulation get;

[0026]Step 2, 6.00 g of urea added to the mixed solution A obtained in the steps of the mixing solution A to all dissolved to give a mixed solution B, an...

Embodiment 2

[0030]The phosphorus-containing tin composite denitrification catalyst containing cerium is composed of a phosphate, iron oxide and tin oxide, and the mass ratio of iron oxide and tin oxide is 1: 0.2: 0.04; The nitrogen oxide conversion of the phosphorus-containing iron-containing iron-containing composite denitration catalyst at a temperature condition of 150 ° C to 350 ° C reaches 90% or more.

[0031]The preparation method of the phosphorus-containing tin composite denitrifination catalyst containing the present embodiment includes the steps of:

[0032]Step 1, 4.34 g of six-water nitrate is dissolved in 100 g of deionized water, then mixed into aqueous pyrophosphate aqueous solution to mix well, resulting in a mixed solution A; the aqueous pyrophosphate solution is dissolved from 0.89 g of pyrophosphate in 100 g of water formulated get;

[0033]Step 2, 6.00 g of urea was added to the mixed solution A obtained in the step one to completely dissolve the mixed solution B, and then the mixed...

Embodiment 3

[0037]The phosphorus iron-containing iron-containing composite denitration catalyst of this embodiment is composed of a phosphate, iron oxide and tin oxide, and the mass ratio of iron oxide and tin oxide is 1: 0.2: 0.05; The nitrogen oxide conversion of the phosphorus-containing iron-containing iron-containing composite denitration catalyst at a temperature condition of 150 ° C to 350 ° C reaches 90% or more.

[0038]The preparation method of the phosphorus-containing tin composite denitrifination catalyst containing the present embodiment includes the steps of:

[0039]Step 1, 4.34 g of six-water nitrate is dissolved in 100 g of deionized water, then mixed into aqueous pyrophosphate aqueous solution to mix well, resulting in a mixed solution A; the aqueous pyrophosphate solution is dissolved from 0.89 g of pyrophosphate in 100 g of water formulated get;

[0040]Step 2, 6.00 g of urea was added to the mixed solution A obtained in the step 1 to completely dissolve the mixed solution B, and th...

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Abstract

The invention discloses a low-temperature, sulfur-resistant phosphorus-containing cerium-iron-tin composite denitration catalyst, which is composed of cerium phosphate, iron oxide and tin oxide in a mass ratio of 1:0.2:(0.03-0.07); the The phosphorus-containing cerium-iron-tin composite denitrification catalyst has a nitrogen oxide conversion rate of more than 90% at a temperature of 150°C to 350°C; the invention also discloses a low-temperature, sulfur-resistant phosphorus-containing cerium-iron-tin composite denitration catalyst. A preparation method, the method uses cerous nitrate, pyrophosphoric acid and urea as raw materials to carry out hydrothermal reaction to prepare cerium phosphate, and then supports iron oxide and tin oxide on the cerium phosphate. The catalyst of the invention has a large specific surface area and surface acidity, is beneficial to improving the low-temperature activity of the catalyst, has better low-temperature catalytic activity and better sulfur resistance; the preparation method of the invention is simple, and is beneficial to realize industrial production.

Description

Technical field[0001]The present invention belongs to the field of environmental technology, and more particularly to a low temperature, anti-sulfur-containing phosphorus ferrous-composite denitration catalyst and a preparation method thereof.Background technique[0002]Nitrogen oxides are mainly due to high temperature combustion in air in the air, with nitrogen oxides produced by mineral fuels (including petroleum, coal, natural gas) to 90%. NO in the nitrogen oxide can produce chemical smoke under sunlight, which gives a very threat, while destroying the atmosphere and indirect formation of acid rain. With the rapid development of the industry, the concentration of nitrogen oxides discharged from automobile exhaust and coal-fired flue gas increased year by year. NH3-SCR as the most widely used, mature nitrogen oxide removal technology, which uses the catalyst VW-TI having a higher denitration rate and better restrioviocephalation; but its temperature window (350 ° C ~ 400 ° C) is m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/185B01D53/86B01D53/56
CPCB01D53/8628B01J27/1853
Inventor 李飞仵静刘程侯鑫龚甍
Owner THE NORTHWEST RES INST OF CHEM IND
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