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Copper-based catalyst for ammonia selective catalytic reduction of NOx and preparation method of copper-based catalyst

A copper-based catalyst and selective technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of complex catalyst composition and narrow applicable temperature of catalysts

Pending Publication Date: 2021-07-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN106111183A discloses a catalyst for selective catalytic reduction of nitrogen oxides and a preparation method thereof. The catalyst includes a molecular sieve and a transition metal loaded on the molecular sieve, and is made of a molecular sieve and a transition metal precursor. After drying the molecular sieve, To remove the adsorbed moisture; then mix the metal precursor with water, stir and dissolve to obtain a solution; stir and mix the prepared solution with the pretreated molecular sieve, let stand, dry, calcinate, and cool to room temperature to obtain the selective Catalyst for catalytic reduction of nitrogen oxides, but the applicable temperature of the catalyst is narrow
[0005] CN104437608A discloses a catalyst for nitrogen oxide ammonia selective catalytic reduction, said catalyst composition includes active component Fe, rare earth element additive (La, Ce or Sm) and molecular sieve carrier (Beta or Beta and ZSM-5 mixture), but the composition of the catalyst is relatively complex

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  • Copper-based catalyst for ammonia selective catalytic reduction of NOx and preparation method of copper-based catalyst
  • Copper-based catalyst for ammonia selective catalytic reduction of NOx and preparation method of copper-based catalyst
  • Copper-based catalyst for ammonia selective catalytic reduction of NOx and preparation method of copper-based catalyst

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Embodiment 1

[0080] This embodiment provides a Cu-CHA catalyst, the copper-based catalyst of the Cu-CHA includes a CHA molecular sieve with a silicon-to-aluminum ratio of 4.2, and a copper active component loaded on the CHA molecular sieve; the molecular sieve has an aperture of The loading amount of copper in the copper-based catalyst is 4.0wt.%.

[0081] This embodiment also provides the preparation method of described Cu-CHA catalyst, and described preparation method comprises the following steps:

[0082] (1) First, 1.542g NaAlO 2 Completely soluble in 14.166g H 2 O, then add 2.298g CuSO 4 ·5H 2 O, after stirring for 1 h, add 2.139 g of TEPA dropwise, then add 1.1 g of NaOH, and after stirring for 3 h, add 10 mL of silica sol (30 wt %); put the completely mixed gel into a 100 mL hydrothermal reaction kettle, and Crystallization reaction at 120°C for 5 days to obtain a crystallized product;

[0083] (2) Suction filter the crystallized product with deionized water, wash it, and the...

Embodiment 2

[0085] The present embodiment provides a kind of Cu-AEI catalyst, and the copper-based catalyst of described Cu-AEI comprises the AEI molecular sieve that silicon-alumina ratio is 7.3, and the copper active component loaded on AEI molecular sieve; The aperture of described molecular sieve is The loading amount of copper in the copper-based catalyst is 2.8wt.%.

[0086] The present embodiment also provides the preparation method of described Cu-AEI catalyst, and described preparation method comprises the steps:

[0087] (1) Dissolve 3gY molecular sieve in 25.5gH 2 O, then add 4.5g 1,1,3,5-tetramethylpiperidine solution (20wt.%), after stirring for 3h, add 0.75g NaOH, continue stirring for 5h. Put the completely mixed solution into a 100mL hydrothermal reaction kettle, and conduct a crystallization reaction at 140°C for 3 days to obtain a crystallized product;

[0088] (2) Suction filter the crystallized product with deionized water, wash it, then put it into a 100°C oven for...

Embodiment 3

[0091] The present embodiment provides a kind of Cu-KFI catalyst, and the copper-based catalyst of described Cu-KFI comprises the KFI molecular sieve that silicon-alumina ratio is 4.2, and the copper active component loaded on KFI molecular sieve; The aperture of described molecular sieve is The loading amount of copper in the copper-based catalyst is 3.0wt.%.

[0092] The present embodiment also provides the preparation method of described Cu-KFI catalyst, and described preparation method comprises the steps:

[0093] (1) 0.327g sodium aluminate (NaAlO 2 ) into 3.8g of deionized water, and stir until evenly mixed; add 0.05g of sodium hydroxide (NaOH), and stir for 1 hour; add 2.5g of potassium nitrate (KNO 3 ), stirred for 1 hour; added 3.2g of silica sol, stirred for 24h; added 0.05g of seed crystal, stirred for 1h. The obtained solution was put into a reaction kettle, and crystallized at 140°C for 3 days to obtain a crystallized product;

[0094] (2) The crystallized pr...

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Abstract

The invention provides a copper-based catalyst for ammonia selective catalytic reduction of NOx. The copper-based catalyst comprises a molecular sieve with a silica-alumina ratio of less than or equal to 8 and a copper active component loaded on the molecular sieve, and the molecular sieve has a small pore size and can provide a large number of ion exchange sites and acidic sites, so good active sites are provided for the adsorption activation of NOx and NH3, and the important promotion effect on the rapid NH3-SCR reaction is provided. The catalyst can improve the catalytic reduction efficiency and broaden the temperature window when the catalyst is applied to the ammonia selective catalytic reduction of NOx, and has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for ammonia selective catalytic reduction of NO x Copper-based catalyst and its preparation method. Background technique [0002] Nitrogen oxides (NO x ) is an important class of pollutants in the atmosphere, which has made important contributions to a series of air pollution phenomena such as acid rain, haze and photochemical smog. In existing NO x Removal technology, NH 3 Selective reduction (NH 3 -SCR) is to purify NO x The most widely used and most effective technical means. At the heart of the technology is the NH 3 -SCR catalyst. In order to meet the treatment conditions of different tail gas or flue gas, NH 3 -SCR catalysts need to have a wide denitration temperature window, good low-temperature catalytic performance and excellent hydrothermal stability, etc. [0003] Zeolite molecular sieve catalyst, especially zeolite with small pore structure, becau...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01D53/86B01D53/56
CPCB01J29/763B01J29/76B01D53/8628
Inventor 贺泓杜金鹏单玉龙刘忠其余运波
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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