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CHA-type silicon-aluminum molecular sieves, and preparation methods and applications thereof

A silicon-aluminum molecular sieve and silicon-aluminum ratio technology, which is used in separation methods, molecular sieve catalysts, chemical instruments and methods to achieve uniform distribution, cost savings, and controllable grain size.

Active Publication Date: 2016-02-10
南京开丽环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effective preparation method of this zeolite has not been reported yet, and it is necessary to develop and develop a zeolite that is more suitable as a carrier for a catalyst for automobile exhaust purification and has better performance.

Method used

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  • CHA-type silicon-aluminum molecular sieves, and preparation methods and applications thereof
  • CHA-type silicon-aluminum molecular sieves, and preparation methods and applications thereof
  • CHA-type silicon-aluminum molecular sieves, and preparation methods and applications thereof

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preparation example Construction

[0067] As mentioned above, the present invention discloses a method for preparing the above-mentioned CHA-type silica-alumina molecular sieve, which comprises the following steps:

[0068] 1) Prepare sol: mix template agent, alkali and water, add aluminum source and silicon source, stir evenly between 25-45°C;

[0069] 2) Get the sol of step 1), join in the autoclave, add 0.1-5wt% weight (relative to SiO in the silicon source 2 weight) seed crystals, stirred, and crystallized at 165-190°C for 10-30 hours, wherein the stirring speed was 80-240rpm;

[0070] Wherein, the alkali is potassium hydroxide (KOH).

[0071] In the present invention, the silicon source is selected from inorganic silicon. Preferably, it is silica sol containing silica or solid silica gel for column chromatography.

[0072] In the present invention, the aluminum source is selected from one or more of aluminum nitrate, aluminum hydroxide, pseudoboehmite, aluminum oxide, aluminum powder and aluminum sulfat...

Embodiment 1

[0085] Embodiment 1 (preparation CHA type silica-alumina molecular sieve)

[0086] Prepare CHA-type silica-alumina molecular sieves through the following steps:

[0087] 1) Colloidal preparation: add template agent (75.92g, 23.25%, 0.084mol), KOH (104.0g, 91.17%, 1.69mol) in 800g of water to prepare the solution, and aluminum sulfate (46.95g, 0.070 mol) was dissolved in 270g of water, and after stirring for half an hour, silica sol (498.42g, 30.00%, 2.49mol) was added, and a uniform translucent colloid was obtained after stirring at 35°C for half an hour.

[0088] The molecular formula of the templating agent is (R 1 -N + (R 2 ) 3 ) m A m- , where R 1 for adamantane, R 2 They are the same as methyl, m is equal to 1, and A is hydroxide, which is obtained from purchase.

[0089] 2) Transfer the colloid in step 1) to a 2L autoclave, add 2.5g of seed crystals, crystallize at 180°C for 10 hours under stirring at 120rpm, and filter to obtain the crude product of the CHA-typ...

Embodiment 2

[0099] Embodiment 2 (preparation of CHA type silica-alumina molecular sieve)

[0100] Prepare CHA-type silica-alumina molecular sieves through the following steps:

[0101] 1) Colloidal preparation: add template agent (176.73g, 23.25%, 0.20mol) and KOH (47.76g, 91.17%, 0.78mol) into a beaker to prepare a solution prepared by dissolving 760g of water, and then add aluminum sulfate (43.33 g, 0.065mol) was dissolved in 250g water to prepare the solution, after stirring for half an hour, silica sol (546.77g, 30.00%, 2.73mol) was added, and a uniform translucent colloid was obtained after stirring at 35°C for half an hour.

[0102] The molecular formula of the templating agent is (R 1 -N + (R 2 ) 3 ) m A m- , where R 1 for adamantane, R 2 They are the same as methyl, m is equal to 1, and A is hydroxide, which is obtained from purchase.

[0103] 2) Transfer the colloid in step 1) to a 2L autoclave, add 3.0g of seed crystals, crystallize at 180°C for 10 hours under stirring ...

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Abstract

The invention discloses CHA-type silicon-aluminum molecular sieves, an automobile tail gas purification catalyst prepared with the molecular sieve, and preparation methods and applications thereof. The CHA-type silicon-aluminum molecular sieves are a series of molecular sieves with different silicon-to-aluminum ratios. The grain sizes are controllable and are uniformly distributed. The molecular sieves are especially suitable for satisfying the performance demands of automobile tail gas purification catalysts. Also, the automobile tail gas purification catalyst with the CHA-type silicon-aluminum molecular sieve as a carrier has excellent high-temperature hydrothermal stability and high-efficiency denitration catalytic activity. The molecular sieve can be widely applied in the aspects of petrochemical engineering, and chemistry and chemical engineering.

Description

technical field [0001] The invention relates to a molecular sieve and its preparation method and application, in particular to a CHA type silica-alumina molecular sieve and its preparation method and application. Background technique [0002] Today's haze weather mainly comes from the incomplete removal of nitrogen oxides in the exhaust of diesel engines. With the rapid development of the economy, the continuous improvement of the quality of life, people's awareness of environmental protection is getting stronger and stronger, and urban residents have higher and higher requirements for air quality. Catalysts for exhaust gas purification can effectively control the emission of harmful substances and protect the ecological environment and human health. [0003] In the early days, people used two-way catalysts to remove toxic carbon monoxide and incompletely combusted hydrocarbons in automobile exhaust through redox. However, the exhaust also contains nitrogen oxides, which ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J29/072B01D53/94B01D53/56
Inventor 孙红
Owner 南京开丽环保材料有限公司
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