Quaternary composite oxide low-temperature SCR (selective catalytic reduction) catalyst and preparation method thereof

A technology of SCR catalyst and composite oxide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc. Problems such as easy sintering and peeling can be achieved to increase electron transfer, ensure continuous progress, improve dispersion and bonding strength

Inactive Publication Date: 2016-11-30
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] General MnOx-CeO 2 /TiO 2 -ZrO 2 Divided into two steps of carrier preparation and impregnation, the active component is loaded on the prepared TiO 2 -ZrO 2 The catalyst was prepared on the carrier to obtain a certain denitrification activity, but the dispersion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve titanium sulfate and zirconium tetrachloride in water (ice water bath), add 30% ammonia water drop by drop to obtain a white precipitate, after the precipitation is complete, filter and wash the precipitate with deionized water to remove chloride ions and sulfate ions . Use 20% nitric acid to completely dissolve the white precipitate, add manganese nitrate and cerium nitrate to the solution, then gradually drop the solution into 30% ammonia water during stirring to obtain a precipitate, filter, and wash the precipitate with deionized water , dried at 120°C, and then calcined at 550°C for 4.5h to obtain Mn-Ce-Ti-Zr-O x catalyst. Where Mn:Ce:Ti:Zr=0.3:0.05:1:1.

[0028] The catalyst is packed in a fixed bed reactor for catalyst activity experiment, and the application process is NO:NH 3 =1,O 2 Concentration 6%, GHSV (gas space velocity per hour) = 10000h -1 SCR flue gas denitrification, when the reaction temperature is 140°C, the catalytic efficiency is 85.4...

Embodiment 2

[0030] Dissolve titanium sulfate and zirconium nitrate in water, add 30% ammonia water drop by drop to get white precipitate, after the precipitation is complete, filter and wash to remove chloride ion and sulfate ion. Use 20% nitric acid to completely dissolve the white precipitate, add manganese nitrate and cerium nitrate to the solution, then gradually drop the solution into 30% ammonia water during stirring to obtain the precipitate, filter, wash, and dry at 120°C , and then calcined at 550°C for 4.5h to obtain Mn-Ce-Ti-Zr-O x catalyst. Where Mn:Ce:Ti:Zr=0.1:0.05:1:1.

[0031] Application processing NO: NH 3 =1,O 2 Concentration 6%, GHSV (gas space velocity per hour) = 10000h -1 The SCR flue gas denitrification method, when the reaction temperature is 140°C, the catalytic efficiency is 89.1%, and 150ppm of SO is added 2 and 8% H 2 After O, the catalytic efficiency was 85.4% at 140 °C.

Embodiment 3

[0033] Dissolve titanyl sulfate and zirconium tetrachloride in water (ice-water bath), add 30% ammonia water drop by drop to obtain a white precipitate, after the precipitation is complete, filter and wash to remove chloride ions and sulfate ions. Use 20% nitric acid to completely dissolve the white precipitate, add manganese nitrate and cerium nitrate to the solution, then gradually drop the solution into 30% ammonia water during stirring to obtain the precipitate, filter, wash, and dry at 120°C , and then calcined at 550°C for 4.5h to obtain Mn-Ce-Ti-Zr-O x catalyst. Where Mn:Ce:Ti:Zr=0.6:0.4:1:1.

[0034] Application processing NO: NH 3 =1,O 2 Concentration 6%, GHSV=10000h -1 SCR flue gas denitrification, when the reaction temperature is 140°C, the catalytic efficiency is 84.2%, adding 150ppm SO 2 and 8% H 2 After O, the catalytic efficiency was 80.1% at 140 °C.

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Abstract

The invention discloses a quaternary composite oxide low-temperature SCR (selective catalytic reduction) catalyst and a preparation method thereof. According to the catalyst, TiO2-ZrO2 serves as a carrier, and a manganese-cerium oxide is loaded on the carrier. The mole ratio of Ti to Zr to Mn to Ce in the catalyst is 1: 1: (0.005-1): (0.005-1). The obtained catalyst has the advantages that SCR operation temperature is reduced, high NO removal rate can be reached at the temperature of 80-180 DEG C when NH3 serves as a reducing agent in the SCR process, high catalytic efficiency can be kept when a system contains SO2 and H2O, and the system harmed by the SO2 can be restored.

Description

technical field [0001] The invention relates to a low-temperature SCR catalyst for removing NOx from flue gas, in particular to a low-temperature SCR catalyst based on Mn-Ce-Ti-Zr system with anti-sulfur dioxide and water performance and a preparation method thereof. Background technique [0002] Ammonia NH 3 As a reducing agent, selective catalytic reduction (SCR) NOx removal technology is currently the most widely used flue gas denitrification technology. NH 3 , NO and O 2 Oxidation-reduction reactions occur under the action of catalysts to generate N 2 and H 2 O. The catalyst used is mainly V 2 o 5 / TiO 2 series, the catalyst temperature window is 300-450°C. In order to reduce the temperature of the SCR reaction, it is of great significance to research and develop low-temperature (below 180°C) SCR reaction technology and SCR catalysts that are active under low-temperature conditions. [0003] MnOx supported on TiO 2 As a low-temperature SCR catalyst, it has bee...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/90B01D53/56
CPCB01J23/34B01D53/56B01D53/90B01D2251/2062B01D2255/407B01J23/002B01J2523/00B01J2523/3712B01J2523/47B01J2523/48B01J2523/72
Inventor 胡宇峰薛建明王小明
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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