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

A silicon-aluminum-phosphorus molecular sieve and phosphoric acid technology, applied in separation methods, molecular sieve catalysts, chemical instruments and methods, etc., to achieve the effects of controllable grain size, cost saving, and uniform distribution

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

AI Technical Summary

Problems solved by technology

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

Method used

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

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preparation example Construction

[0058] As mentioned above, the present invention discloses a preparation method of the above-mentioned CHA type silicon aluminum phosphorus molecular sieve, which comprises the following steps:

[0059] 1) Compounding sol: After adding silicon source, aluminum source and water to the mixed template agent, add phosphoric acid and stir evenly between 25-45°C;

[0060] 2) Get the sol of step 1), add 0.1-5wt% weight (relative to SiO in the silicon source 2 weight) seed crystals were added into the autoclave, stirred, and crystallized at 165-200° C. for 10-48 hours, wherein the stirring speed was 80-240 rpm.

[0061] 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.

[0062] In the present invention, the aluminum source is selected from one or more of aluminum hydroxide, pseudoboehmite, aluminum oxide and aluminum powder.

[0063] In the present invention,...

Embodiment 1

[0073] The CHA type silicon aluminum phosphorus molecular sieve is prepared by the following steps:

[0074] 1) Colloidal sol: add silica sol (76.20g, 30%, 0.38 mol), after stirring for half an hour, add water (990 grams, 54.99 moles), and after stirring for half an hour, pseudo-boehmite (109.8g, 76.5%, 0.83mol), add phosphoric acid (219.60g, 85%, 1.91mol), Stir at 35°C for half an hour to obtain a homogeneous translucent colloid.

[0075] 2) Transfer the colloid in step 1) to a 2L autoclave, add 1.00g of seed crystals, crystallize at 180°C for 20 hours under stirring at 120rpm, and filter to obtain the crude product of the CHA-type silicon-aluminum-phosphorus molecular sieve (denoted as molecular sieve X).

[0076] Post-processing is performed as follows:

[0077] i) washing the above-mentioned molecular sieve X with water,

[0078] ii) calcining the product of step i) at 600° C. to obtain the final acidic CHA-type silicon-aluminum-phosphorus molecular sieve (referred to ...

Embodiment 2

[0082] The CHA type silicon aluminum phosphorus molecular sieve is prepared by the following steps:

[0083] 1) Colloidal sol: add triethylamine (278.94g, 99%, 2.67 moles) and adamantane ammonium (adamantane ammonium: R 1 -N + (R 2 ) 3 ) m A m- , where R 1 is adamantane, R 2 The same is methyl, A is hydroxide, m is equal to 186.43g, 23.25%, 0.096 moles), add silica sol (61.23g, 30%, 0.31 moles) to the two-component template agent, stir for half an hour, add water (1080 grams, 60.00 moles), add pseudo-boehmite (128.49g, 76.5%, 0.96 moles) and stir for half an hour, add phosphoric acid (241.36g, 85%, 2.10 moles), and stir for half an hour at 35°C to obtain a uniform half Transparent colloid.

[0084] 2) Transfer the colloid in step 1) to a 2L autoclave, add 0.80g of seed crystals, crystallize at 180°C for 15 hours under stirring at 120rpm, and filter to obtain the crude product of the CHA-type silicon-aluminum-phosphorus molecular sieve (denoted as molecular sieve Y). ...

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Abstract

The invention discloses CHA-type silicon-aluminum-phosphorous molecular sieves, an automobile tail gas purification catalyst prepared with the molecular sieve, and preparation methods and applications thereof. The CHA-type silicon-aluminum-phosphorous molecular sieves are a series of molecular sieves with different oxide contents. 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-phosphorous molecular sieve as a carrier has excellent high-temperature and low-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 silicon aluminum phosphorus 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. Exhaust gas purification catalysts 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,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/94
Inventor 孙红
Owner 南京开丽环保材料有限公司
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