Preparation method of SSZ-13 hydrogen type molecular sieve, and preparation method of SCR catalyst

A technology of hydrogen-type molecular sieve and ammonium hydroxide, which is applied in the field of catalysis, can solve the problems of high cost, narrow operating temperature window, poor selection of low-temperature section, etc., and achieve the effects of reduced production cost, saved preparation time, and low price

Inactive Publication Date: 2018-03-16
FUYANG XINYIHUA MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the SCR catalyst is mainly WO 3 or MoO 3 Doped V 2 o 5 / TiO 2 Catalyst, but there are many problems in this catalyst, such as V with biotoxicity 2 o 5 Shedding occurs during use, threatening human health, the operating temperature window is narrow, and the low temperature section is poorly selected
[0004] Based on the above technical problems, a Cu-SSZ-13 catalyst has been developed, which has high catalytic activity, good hydrothermal stability, and strong resistance to HCs poisoning. It is an excellent SCR catalyst, but the traditional Cu-SSZ- Among the 13 catalysts, the preparation time of hydrogen-type molecular sieves is long and the cost is high, which makes Cu-SSZ-13 catalysts unable to be mass-produced

Method used

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  • Preparation method of SSZ-13 hydrogen type molecular sieve, and preparation method of SCR catalyst
  • Preparation method of SSZ-13 hydrogen type molecular sieve, and preparation method of SCR catalyst
  • Preparation method of SSZ-13 hydrogen type molecular sieve, and preparation method of SCR catalyst

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preparation example Construction

[0034] see figure 1 , the preparation method of the SSZ-13 hydrogen molecular sieve provided by the embodiment of the present invention comprises:

[0035] Step S110: mixing the aluminum source, the template agent, and the silicon source together in an alkaline aqueous solution, and performing a gelation reaction to obtain a gel;

[0036] Step S120: Under the action of the seed crystal, the gel undergoes a crystallization reaction to obtain a crystallized product;

[0037] Step S130: Carry out the first roasting of the crystallized product to obtain the first roasted product, then perform ion exchange on the first roasted product in an ammonium salt solution, and perform a second roasting on the ion-exchanged first roasted product , to obtain SSZ-13 hydrogen molecular sieve.

[0038] In the preparation method of the SSZ-13 hydrogen molecular sieve provided based on the above-mentioned examples, the aluminum source, template agent, and silicon source that are relatively easy ...

Embodiment 1

[0073] The present embodiment provides a kind of preparation method of SCR catalyst, comprises the following steps:

[0074] Step S210: Prepare SSZ-13 hydrogen molecular sieve by the following method; the specific method includes the following steps:

[0075]Step S111: At room temperature, sequentially add 890.8g of 3-hydroxyadamantanamine and 856.5g of anhydrous formic acid into a 10L reactor, and perform mechanical stirring for 0.5h, start to heat up to 80°C, and 1380.32g of formaldehyde solution (mass concentration is 37% %) was added dropwise under the condition of ℃, and the dropping time was 3h, then the temperature was raised to 98°C, and after the insulation reaction for 5h, the Esweiler-Clark reaction system was obtained; 3-hydroxyadamantine The molar ratio of formaldehyde in alkylamine, anhydrous formic acid and formaldehyde solution is 1:3.5:3.2;

[0076] The Esweiler-Clark reaction system was down to room temperature, and then aqueous sodium hydroxide solution (41...

Embodiment 3

[0098] Step S210: Prepare SSZ-13 hydrogen-type molecular sieves by the following method: step S111-step S113. For the specific method, refer to Example 1.

[0099] Step S114: Add KOH and Al to the Erlenmeyer flask at room temperature 2 (SO 4 ) 3 .18H 2 O, the aqueous solution containing N,N,N-trimethyl-3-hydroxyadamantyl ammonium hydroxide (mass concentration is 25.4%), benzyl trimethyl ammonium hydroxide and deionized water, stirred at room temperature for 1h to dissolve, and then Silica sol was added dropwise for 10 minutes, followed by stirring at 30°C for 2 hours to form a gel; among them, N,N,N-trimethyl-3-hydroxyadamantyl ammonium hydroxide, benzyltrimethylammonium hydroxide and silica sol The molar ratio of silicon is 0.036:0.014:1, silicon and Al in silica sol 2 (SO 4 ) 3 .18H 2 The molar ratio of aluminum in O is 10:1, and the molar ratio of potassium hydroxide to silicon in silica sol is 0.45:1.

[0100] Step S120: Move the gel into the hydrothermal reaction ...

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Abstract

The invention discloses a preparation method of an SSZ-13 hydrogen type molecular sieve, and a preparation method of SCR catalyst, and relates to the technical field of catalyst; the preparation method of the SSZ-13 hydrogen type molecular sieve can shorten the preparation time of the SSZ-13 hydrogen type molecular sieve and reduce the preparation cost, the SCR catalyst can be produced on a largebatch. The preparation method of the SSZ-13 hydrogen type molecular sieve includes steps of mixing aluminum source, template agent and silicon source in the alkali water solution together, and performing gelatinization reaction to obtain gel; under the effect of crystal seed, performing crystallization reaction on the gel, performing the first roasting on the crystalized matter to obtain a first roasting matter; performing ion exchange on the first roasting matter by ammonium salt solution; performing the secondary roasting on the first roasting matter after the ion exchange, so as to obtain the SSZ-13 hydrogen type molecular sieve. The hydrogen type molecular sieve comprises a preparation method of the mentioned SSZ-13 hydrogen type molecular sieve. The SSZ-13 hydrogen type molecular sieve provided by the invention is applied to preparation of the nitric oxide transformation catalyst.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a preparation method of SSZ-13 hydrogen molecular sieve and a preparation method of SCR catalyst. Background technique [0002] Selective catalytic reduction (selective catalytic reduction, abbreviated as SCR) catalyst is a catalyst used in the SCR denitrification system of power plants. In the SCR reaction, the SCR catalyst can promote the selective chemical reaction of the reducing agent with the nitrogen oxides in the flue gas at a certain temperature. [0003] In the prior art, the SCR catalyst is mainly WO 3 or MoO 3 Doped V 2 o 5 / TiO 2 Catalyst, but there are many problems in this catalyst, such as V with biotoxicity 2 o 5 Shedding occurs during use, threatening human health, the operating temperature window is narrow, and the low temperature section is poorly selected. [0004] Based on the above technical problems, a Cu-SSZ-13 catalyst has been developed, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J29/70B01J29/76B01J29/74B01J37/03B01J37/10B01J37/08B01J37/30B01J37/02B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2258/0283B01J29/7049B01J29/74B01J29/76B01J37/0201B01J37/036B01J37/08B01J37/088B01J37/10B01J37/30B01J2229/183C01B39/04C01P2002/72C01P2004/03
Inventor 韩耀华梁珂王广涛龙江湘任明松
Owner FUYANG XINYIHUA MATERIAL TECH
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