Dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst and preparation method thereof

A denitration catalyst, cu-sapo-34 technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of copper-based SAPO-34 catalyst poisoning, low catalytic activity, and complicated synthesis process. problems, to avoid structure damage, simplify synthesis steps, and achieve the effect of simple synthesis method

Pending Publication Date: 2019-11-22
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method is a two-step ion exchange method, the synthesized H-SAPO-34 molecular sieve is first exchanged into NH 4 -SAPO-34, and then converted to Cu-SAPO-34 by ion exchange, the synthesis process is cumbersome
At the same time, when the quality of diesel is poor, in addition to NO x In addition, it also contains a small amount of sulfur dioxide (SO 2 ), while SO 2 Can lead to copper-based SAPO-34 catalyst poisoning, thereby reducing its catalytic reduction of NO x Ability
At the same tim

Method used

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  • Dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst and preparation method thereof
  • Dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst and preparation method thereof
  • Dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst and preparation method thereof

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preparation example Construction

[0043] The preparation method of a kind of dysprosium modified Cu-SAPO-34 molecular sieve denitration catalyst of the present invention comprises the following steps:

[0044] Step 1, dissolve 0.5-0.55g of copper nitrate, 0.005-0.01g of dysprosium nitrate, and 3.4-5.3mL of tetraethylenepentamine in 20mL of deionized water at room temperature, and stir for 60min;

[0045] Step 2, add 2.0-2.5mL phosphoric acid and 2.7-3.5g aluminum hydroxide to the above solution, and continue to stir for 60min;

[0046] Step 3, add 2.0-3.0 mL of 30% aqueous silica solution to the above solution, and stir for 30 min;

[0047] Step 4, then add 1.4-2.0 mL of morpholine and 20-100 mg of SAPO-34 seed crystals into the above solution, and stir for 2 hours;

[0048] Step 5, adding the uniformly stirred above-mentioned solution into a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, and aging at a temperature of 160-200°C for 48-72 hours;

[0049] Step 6, the reaction product is tak...

Embodiment 1

[0057] The preparation method of a kind of dysprosium modified Cu-SAPO-34 molecular sieve denitration catalyst of the embodiment of the present invention 1 comprises the following steps:

[0058] (1) Dissolve 0.50g of copper nitrate, 0.0075g of dysprosium nitrate, and 4.30mL of tetraethylenepentamine in 20mL of deionized water at room temperature, and stir for 60min;

[0059] (2) Add 2.20mL phosphoric acid and 3.10g aluminum hydroxide to the above solution, and continue stirring for 60min;

[0060] (3) Add 2.60 mL of 30% silicon dioxide aqueous solution to the above solution, and stir for 30 min;

[0061] (4) Then add 1.75mL of morpholine and 100mg of SAPO-34 seed crystals into the above solution, and stir for 2h;

[0062] (5) The uniformly stirred solution was added into a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, and aged at a temperature of 200°C for 60 hours.

[0063] (6) The reaction product was taken out from the polytetrafluoroethylene liner, ...

Embodiment 2

[0068] The preparation method of a kind of dysprosium modified Cu-SAPO-34 molecular sieve denitration catalyst of embodiment 2 of the present invention comprises the following steps:

[0069] (1) Dissolve 0.55g of copper nitrate, 0.0100g of dysprosium nitrate, and 4.60mL of tetraethylenepentamine in 20mL of deionized water at room temperature, and stir for 60min;

[0070] (2) Add 2.45mL phosphoric acid and 2.85g aluminum hydroxide to the above solution, and continue stirring for 60min;

[0071] (3) Add 2.60 mL of 30% silicon dioxide aqueous solution to the above solution, and stir for 30 min;

[0072] (4) Then add 1.90 mL of morpholine and 50 mg of SAPO-34 seed crystals into the above solution, and stir for 2 h;

[0073] (5) The uniformly stirred solution was added into a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, and aged at a temperature of 180°C for 48 hours.

[0074] (6) The reaction product was taken out from the polytetrafluoroethylene liner, wa...

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Abstract

The invention discloses a dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst and a preparation method thereof. The preparation method comprises the steps that: 1, weighing an aluminumsource, a silicon source, phosphoric acid, a template agent, copper nitrate, dysprosium nitrate and deionized water, and preparing a homogeneous aqueous solution A; 2, carrying out a hydrothermal reaction on the aqueous solution A obtained in the step 1, and aging the reaction product at 160-200 DEG C to obtain a reaction product B; and 3, washing and drying the reaction product B obtained in thestep 2, and calcining the reaction product B at the temperature of 450 DEG C or above to obtain the dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst. The preparation method disclosed by the invention can be used for preparing the dysprosium modified Cu-SAPO-34 molecular sieve denitration catalyst disclosed by the invention; the dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst provided by the invention can be used for selective catalytic reduction removal of nitrogen oxides in diesel vehicle tail gas, and has certain sulfur dioxide poisoning resistance andgood low-temperature catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of environmental catalysis and the technical field of molecular sieve catalysts, and relates to a modified Cu-SAPO-34 molecular sieve denitration catalyst, in particular to a dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst and a preparation method thereof. Background technique [0002] In recent years, my country has faced severe environmental problems, among which smog is one of the most serious environmental pollution; nitrogen oxides (NO x ) is one of the main components in the composition of smog. NO x The harm is extremely serious. In addition to causing smog problems, it will also cause environmental problems such as acid rain, photochemical smog, and ozone layer destruction. NO x There are two major sources of generation, one is generated by fixed source devices represented by power plants; the other is generated by mobile source devices represented by diesel vehicles. Among th...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J35/10
CPCB01J29/763B01J35/10B01J35/1019B01J35/1023
Inventor 石建稳王宝瑞徐玉蓉
Owner XI AN JIAOTONG UNIV
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