Template agent and preparation method therefor and application thereof

Abstract

The invention discloses a template agent used in the preparation of a carrier for a catalyst for automobile exhaust gas purification and a preparation method therefor and application thereof. The template agent is particularly suitable for preparing novel AEI type silicon-aluminum molecular sieves. In addition, the template agent can be effectively prepared by the method disclosed by the invention, and the total yield of reaction reaches up to 80%; and the method is simple, is low in cost and is applicable to industrial production.

Description

technical field

[0001] The invention relates to a template and its preparation method and application, in particular to a template used in the preparation of a catalyst carrier for automobile tail gas purification, 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 exhau...

Examples

preparation example Construction

[0055] In one embodiment of the present invention, the above-mentioned AEI type silica-alumina molecular sieve is prepared by the following preparation method, which includes the following steps:

[0056] 1) Colloidal preparation: mix template agent, alkali and water, then add Y-type molecular sieve and silicon source, stir evenly between 25-45°C;

[0057] 2) Get the sol of step 1), add 0.1-5wt% weight (relative to SiO in the silicon source 2 Weight) seed crystals are added to the autoclave, stirred, and crystallized at 130-200°C for 5-10 days, wherein the stirring speed is 80-240rpm.

[0058] In the present invention, the alkali is potassium hydroxide or sodium hydroxide.

[0059] 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.

[0060] In the present invention, the Y-type molecular sieve is used as an aluminum source.

[0061] In the present inve...

preparation example 1

[0082] Preparation example 1 (preparation of template agent A)

[0083] Template agent A was prepared by the following steps:

[0084] With 2,6-dimethyl-piperidine as the starting reactant, potassium hydroxide ethanol solution is added to its ethyl bromide ethanol solution, and the reaction occurs at room temperature to produce potassium bromide precipitation to generate 1-ethyl-2 , 6-Dimethyl-piperidine. Concentrate and evaporate to dryness to obtain product (molecular formula is C 9 h 19 N, recorded as template agent A).

[0085] This one-step reaction is a method known to those skilled in the art and will not be repeated here.

preparation example 2

[0086] Preparation example 2 (preparation of template B)

[0087] Template agent B was prepared by the following steps:

[0088] The 500ml toluene solution of the product template agent A (100g, 98%, 0.70 moles) of Preparation Example 1 and diethyl sulfate (180g, 98%, 1.14 moles) was reacted at 110°C in a 2L reflux vessel for 5-6 Hour, after cooling, 1,1-diethyl-2, the salt of 6-dimethyl-piperidinium monoethyl sulfate precipitates out from solution, filters and obtains white product 175.6g, yield 85% (molecular formula for C 13 h 29 NSO 4 , denoted as templating agent B).

technical field

[0001] The invention relates to a template and its preparation method and application, in particular to a template used in the preparation of a catalyst carrier for automobile tail gas purification, 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 exhau...

Examples

preparation example Construction

[0055] In one embodiment of the present invention, the above-mentioned AEI type silica-alumina molecular sieve is prepared by the following preparation method, which includes the following steps:

[0056] 1) Colloidal preparation: mix template agent, alkali and water, then add Y-type molecular sieve and silicon source, stir evenly between 25-45°C;

[0057] 2) Get the sol of step 1), add 0.1-5wt% weight (relative to SiO in the silicon source 2 Weight) seed crystals are added to the autoclave, stirred, and crystallized at 130-200°C for 5-10 days, wherein the stirring speed is 80-240rpm.

[0058] In the present invention, the alkali is potassium hydroxide or sodium hydroxide.

[0059] 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.

[0060] In the present invention, the Y-type molecular sieve is used as an aluminum source.

[0061] In the present inve...

preparation example 1

[0082] Preparation example 1 (preparation of template agent A)

[0083] Template agent A was prepared by the following steps:

[0084] With 2,6-dimethyl-piperidine as the starting reactant, potassium hydroxide ethanol solution is added to its ethyl bromide ethanol solution, and the reaction occurs at room temperature to produce potassium bromide precipitation to generate 1-ethyl-2 , 6-Dimethyl-piperidine. Concentrate and evaporate to dryness to obtain product (molecular formula is C 9 h 19 N, recorded as template agent A).

[0085] This one-step reaction is a method known to those skilled in the art and will not be repeated here.

preparation example 2

[0086] Preparation example 2 (preparation of template B)

[0087] Template agent B was prepared by the following steps:

[0088] The 500ml toluene solution of the product template agent A (100g, 98%, 0.70 moles) of Preparation Example 1 and diethyl sulfate (180g, 98%, 1.14 moles) was reacted at 110°C in a 2L reflux vessel for 5-6 Hour, after cooling, 1,1-diethyl-2, the salt of 6-dimethyl-piperidinium monoethyl sulfate precipitates out from solution, filters and obtains white product 175.6g, yield 85% (molecular formula for C 13 h 29 NSO 4 , denoted as templating agent B).

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