Compounded denitration catalyst, as well as preparation method and application thereof

A denitration catalyst and composite technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low denitration performance of catalysts, high toxicity of precursors, and high cost of catalysts, and improve low-temperature denitration performance. , The effect of improving the safety of use and reducing the cost

Active Publication Date: 2014-12-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, the problem that this catalyst exists is that catalyst cost is high, and active component V 2 o 5 The precursor of the catalyst is highly toxic and easily causes environmental pollution. When the temperature is lower than 300 ° C, the denitrification performance of the catalyst is low

Method used

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  • Compounded denitration catalyst, as well as preparation method and application thereof
  • Compounded denitration catalyst, as well as preparation method and application thereof
  • Compounded denitration catalyst, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: 10wt%CeO 2 -5wt%MoO 3 / TiO 2 Preparation of composite catalyst

[0018] a) Take 4.96ml of 0.03 mol / L ammonium molybdate solution and stir in a 30°C water bath; then add 2.55g of titanium dioxide into the solution and stir for 4 hours to obtain a slurry.

[0019] b) drying the slurry prepared in step a) at 120° C. for 12 hours to prepare a dry sample. The sample was baked in a muffle furnace at 500°C for 4 hours, and after cooling, the sample was ground into powder.

[0020] c) Take 2.18ml of 0.80 mol / L cerium nitrate solution, stir in a 30°C water bath; then add the powder obtained in b) into the solution, and stir for 4 hours to obtain a slurry.

[0021] d) Dry the slurry prepared in step c) at 120°C for 12 hours, and then bake it in a muffle furnace at 500°C for 4 hours to obtain CeO 2 -MoO 3 / TiO 2 catalyst.

Embodiment 2

[0022] Example 2: 10wt%CeO 2 -2wt%MoO 3 / TiO 2 Preparation of composite catalyst

[0023] a) Take 2.98 ml of 0.02 mol / L ammonium molybdate solution, stir in a 30°C water bath; then add 2.55 g of titanium dioxide into the solution, and stir for 4 hours to obtain a slurry.

[0024] b) drying the slurry prepared in step a) at 120° C. for 12 hours to prepare a dry sample. The sample was baked in a muffle furnace at 500°C for 4 hours, and after cooling, the sample was ground into powder.

[0025] c) Take 2.18 ml of 0.80 mol / L cerium nitrate solution, stir in a 30°C water bath; then add the powder obtained in b) into the solution, and stir for 4 hours to obtain a slurry.

[0026] d) Dry the slurry prepared in step c) at 120°C for 24 hours, and then bake it in a muffle furnace at 500°C for 4 hours to obtain CeO 2 -MoO 3 / TiO 2 catalyst.

Embodiment 3

[0027] Example 3: 10wt%CeO 2 -8wt%MoO 3 / TiO 2 Preparation of composite catalyst

[0028] a) Take 1.86 ml of 0.05 mol / L ammonium molybdate solution, stir in a 30°C water bath; then add 2.55 g of titanium dioxide into the solution, and stir for 4 hours to obtain a slurry.

[0029] b) drying the slurry prepared in step a) at 120° C. for 18 hours to prepare a dry sample. The sample was baked in a muffle furnace at 500°C for 4 hours, and after cooling, the sample was ground into powder.

[0030] c) Take 2.18 ml of 0.80 mol / L cerium nitrate solution, stir in a 30°C water bath; then add the powder obtained in b) into the solution, and stir for 4 hours to obtain a slurry.

[0031] d) Dry the slurry prepared in step c) at 120°C for 24 hours, and then bake it in a muffle furnace at 500°C for 4 hours to obtain CeO 2 -MoO 3 / TiO 2 catalyst.

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Abstract

The invention provides a compounded denitration catalyst and a preparation method thereof, and belongs to the technical field of environment catalysis and atmospheric pollution controlling. The catalyst adopts titanium dioxide as a carrier, cerium dioxide as a main active component, and molybdenum trioxide as secondary active component performing a synergistic effect, and is prepared according to a stepped impregnation method. The compounded denitration catalyst is characterized in that due to the adding of molybdenum trioxide, the denitration performance of cerium-titanium catalyst is improved obviously, the active temperature window is widened, and the water resistance of the catalyst is also improved obviously. The method for reducing nitrogen oxides comprises the following steps: filling the catalyst into a fixed bed reactor; controlling the reaction temperature range to be 250 to 400 DEG C; and taking ammonia as a reducing agent. The cerium-molybdenum-titanium compounded catalyst prepared according to the invention is 12,8000 per hour in space velocity, and can purify nitrogen oxides with the efficiency ranging from 83 to 98 percent at the temperature ranging from 250 to 400 DEG C.

Description

technical field [0001] The invention relates to a composite catalyst, its preparation and a method for selectively catalytically reducing nitrogen oxides under oxygen-enriched conditions by using the catalyst. It is suitable for nitrogen oxides (NO x ) and belongs to the technical field of environmental catalysis and air pollution control. Background technique [0002] Nitrogen oxides are a major air pollutant, and the acid rain and photochemical smog caused by them have become increasingly prominent global environmental problems. Therefore, the emission control of NOx under oxygen-enriched conditions has become an important issue in the field of atmospheric environmental protection technology. research hotspot. Ammonia selective catalytic reduction (Selective catalytic reduction, SCR) is considered to be one of the most effective methods to eliminate NOx from stationary sources, and the core issue is the development of catalysts. Currently, NH for industrial applications...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28B01D53/90B01D53/56
Inventor 刘志明张绍轩易扬
Owner BEIJING UNIV OF CHEM TECH
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