Honeycomb low temperature flue gas denitration catalyst and preparation method thereof

A denitrification catalyst and low-temperature flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as complex preparation process, achieve wide temperature window, improve dispersion degree, and inhibit catalyst Inactivation effect

Active Publication Date: 2016-09-28
展宗城
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN102266761 reports a method for preparing low-temperature SCR catalyst powder. First, the co-precipitation method is used to prepare ZrO 2 -TiO 2 Composite metal oxide supports, and then supported CeO by impregnation method 2 、WO 3 and V 2 o 5 Active component, the catalyst exhibits good catalytic activity in the range of 150-450°C, but its preparation process is complicated
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Method used

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preparation example Construction

[0052] A method for preparing a honeycomb low-temperature flue gas denitrification catalyst, comprising the steps of:

[0053] Preparation of S1 catalyst powder:

[0054] S101 Add deionized water into the reaction kettle and heat it to 40-80°C, add oxalic acid or citric acid and stir until it is completely dissolved, then add the active component precursor and auxiliary agent precursor, and stir well to obtain the active component impregnation solution, wherein , the V 2 o 5 The molar ratio of the precursor to oxalic acid or citric acid is 1: (0.8-4); preferably, S101 adds deionized water to the reaction kettle and heats it to 40-80°C, adds oxalic acid or citric acid and stirs until it is completely dissolved, and then Join V 2 o 5 、WO 3 or MoO 3 Active component precursor, or add rare earth oxide active component precursor; add P 2 o 5 Auxiliary precursor, or add SO 3 Auxiliary agent precursor, stirred at 40-80°C for 10-60min to obtain active component impregnation s...

Embodiment 1

[0079] The steps in all the embodiments correspond to the steps in S1 and S2, and for the convenience of description, the step numbers are changed.

[0080] 1) Catalyst powder preparation

[0081] Step 1: Add 750 parts by weight of deionized water into the reactor and heat to 50-55°C, add 95 parts by weight of oxalic acid and stir until completely dissolved, slowly add 23 parts by weight of ammonium metavanadate (completely added in 10-30min), and stir After 20-30 minutes, add 44.5 parts by weight of ammonium molybdate, 8.5 parts by weight of triammonium phosphate and 126 parts by weight of cerium nitrate, and continue to stir at 50 ° C for 30 minutes to obtain an active component impregnation solution.

[0082] Step 2, add 600 parts by weight of TiO 2 powder, stirred at 45°C for 20 minutes to obtain a viscous slurry, stirred and ultrasonically dispersed for 1.5 hours,

[0083] Step 3: Dry the catalyst slurry in the reaction kettle at 250°C for 3.0 hours, crush it and roast ...

Embodiment 2

[0113] 1) Catalyst powder preparation

[0114] Step 1: Add 750 parts by weight of deionized water to the reactor and heat to 50-55°C, add 95 parts by weight of oxalic acid and stir until completely dissolved, slowly add 23 parts by weight of ammonium metavanadate (completely added in 10-30min) and stir 20-30min, add 32.8 parts by weight of ammonium tungstate, 8.5 parts by weight of triammonium phosphate, 2.5 parts by weight of ammonium sulfate and 126 parts by weight of cerium nitrate, and continue stirring at 50°C for 30 minutes to obtain an active component impregnation solution;

[0115] Step 2, add 600 parts by weight of TiO 2 Powder, stirred at 45°C for 20 minutes to obtain a viscous slurry, then stirred and ultrasonically dispersed for 1.5 hours;

[0116] Step 3: Dry the catalyst slurry in the reactor at 250°C for 3.0 hours, crush it, and roast it at 450°C for 3.5 hours, cool it down to room temperature naturally, and crush it to 200 mesh.

[0117] Through the prepared...

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Abstract

The invention relates to a honeycomb low temperature flue gas denitration catalyst and a preparation method thereof, and belongs to the field of atmosphere pollution control and environment catalysis materials. The catalyst adopts TiO2, V2O5, MoO3, WO3 and rare earth (La, Ce, Pr, Nd, Zr and Y) oxides as active components and P2O5 and SO3 as modification assistants, and is prepared through powder preparation, mixing and kneading steps. The catalyst has an excellent removal effect on NOx in low temperature flue gas, and the denitration efficiency at 170-180DEG C can reach 90% or above. The catalyst has high mechanical strength and anti-wear resistance, the vertical compressive strength is greater than 2.4MPa, and the hard end fly ash wear rate is smaller than 0.08%/Kg. The erosion, wearing and etching of fly ash to the catalyst are reduced, so the service life of the catalyst is prolonged. The catalyst has the advantages of simple and easily available production raw materials, simple and easily controllable preparation process, and easy realization of industrial production.

Description

technical field [0001] The invention belongs to the field of air pollution control and environmental catalytic materials, and specifically relates to a honeycomb low-temperature flue gas denitrification catalyst and a preparation method thereof. NOx emission control of flue gas or process waste gas, and denitrification process of electric boiler with low temperature and low dust arrangement. Background technique [0002] Nitrogen oxides (NOx), which have become 2 Another global air pollutant after that, NOx in the atmosphere has a high contribution value to many environmental problems such as global warming, acid rain, photochemical smog, increased surface ozone concentration, and water pollution, and has become a major urban air pollutant. primary pollutant. my country is a country with large NOx emissions, mainly from power plant boilers, transportation and various industrial processes. The annual emissions are more than 20 million tons, and it shows a trend of increasin...

Claims

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Application Information

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IPC IPC(8): B01J27/199
CPCB01J27/199B01J35/0066B01J35/04
Inventor 展宗城杨艳林展宗刚袁小芳杨峰
Owner 展宗城
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