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Mesoporous material and preparation method thereof as well as catalyst and preparation method thereof

A technology of mesoporous material and dehydrogenation catalyst, which is applied in the field of organic chemical synthesis, can solve the problems of long process, frequent catalyst regeneration, large amount of low-carbon hydrocarbons, etc., and achieves good thermal stability, many active points, and large specific surface area. Effect

Inactive Publication Date: 2012-09-26
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of the two-step method is longer, while the one-step method uses microporous molecular sieve as the catalyst carrier, the regeneration of the catalyst is more frequent, and the generation of low-carbon hydrocarbons is relatively large

Method used

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  • Mesoporous material and preparation method thereof as well as catalyst and preparation method thereof
  • Mesoporous material and preparation method thereof as well as catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh Cr(NO 3 ) 3 ●6H 2 O 12g, Al(NO 3 ) 3 ●9H 2 O 10g, silica sol (containing SiO 2 30%) 20g is miscible in 100ml deionized water; weigh 2g of trimethylhexadecylammonium bromide and dissolve it in 100ml deionized water, then mix the two solutions under vigorous stirring, and adjust the pH value with 1M NaOH aqueous solution Adjust to 10.5 and continue stirring for 60 minutes. Transfer the generated slurry material to a 300ml stainless steel synthesis kettle and heat up to 120°C to continue the reaction for 100h. After the reaction is completed, cool to room temperature, discharge the material and wash it several times with a centrifuge. The filter cake is dried at room temperature, and then Calcined in a tube furnace at 550°C for 20h in an air atmosphere to obtain a solid substance, the specific surface area of ​​which was measured by nitrogen adsorption method (BET method) was 520m 2 / g, XRD method determines that it has a mesoporous structure, indicating that t...

Embodiment 2

[0037] Weigh Cr(NO 3 ) 3 ●6H 2 O 5g, Al(NO 3 ) 3 ●9H 2 O 15g, ethyl orthosilicate 40g is miscible in 90ml deionized water; weigh 1g trimethylhexadecyl ammonium bromide and dissolve it in 100ml deionized water, then mix the two solutions under vigorous stirring, and use 1M Aqueous NaOH solution was used to adjust the pH to 12 and stirring was continued for 60 minutes. Transfer the generated slurry material to a 300ml stainless steel synthesis kettle and heat up to 120°C to continue the reaction for 100h. After the reaction is completed, cool to room temperature, discharge the material and wash it with a centrifuge for several times. The filter cake is dried at room temperature, and then Calcined in a tube furnace at 550°C for 20h in an air atmosphere, a solid substance was obtained, and its specific surface area was 530m3 measured by nitrogen adsorption method (BET method). 2 / g, XRD method determines that it has a mesoporous structure, indicating that the prepared materi...

Embodiment 3

[0039] Weigh Cr(NO 3 ) 3 ●6H 2 O 7g, Al(NO 3 ) 3 ●9H 2 O 10g, Na 2 SiO 3 14g was dissolved in 108ml deionized water; 2g betaine was weighed and dissolved in 150ml deionized water, then the two solutions were mixed under vigorous stirring, the pH value was adjusted to 7 with 1M NaOH aqueous solution, and stirring was continued for 60 minutes. Transfer the generated slurry material to a 300ml stainless steel synthesis kettle and heat up to 120°C to continue the reaction for 100h. After the reaction is completed, cool to room temperature, discharge the material and wash it with a centrifuge for several times. The filter cake is dried at room temperature, and then Calcined in a tube furnace at 550°C for 20 hours in an air atmosphere to obtain a solid substance, the specific surface area of ​​which was measured by nitrogen adsorption method (BET method) was 516m 2 / g, XRD method determines that it has a mesoporous structure, indicating that the prepared material is the high...

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Abstract

The invention relates to a mesoporous material and a preparation method of the mesoporous material; the mesoporous material comprises the raw materials by weight percent: 1-30% of Cr2O3, 5-20% of Al2O3 and 50-90% of SiO2. The mesoporous material prepared by the invention has good heat stability and larger specific surface area, and is regular in structure and more in active points. The invention also relates to a catalyst taking the mesoporous material as carrier, and a preparation method of the catalyst; the catalyst comprises the raw materials by weight percent: 5-25% of Cr2O3, 4-15% of Al2O3, 50-85% of SiO2, 0.2-10% of Me and 0.1-5% of MxO. The catalyst prepared by the invention has the specific surface area larger than 150m<2> / g, and is stable in structure and excellent in catalytic activity.

Description

technical field [0001] The present invention relates to a kind of mesoporous material and its preparation method and catalyst and its preparation method, especially a kind of mesoporous material Cr-Al-Si-O and its preparation method and light alkane isomerization dehydrogenation catalyst and its preparation method , belongs to the technical field of organic chemical synthesis. Background technique [0002] The isomeric dehydrogenation of alkanes is an important industrial production process for preparing isomeric olefins from normal alkanes, such as the isomeric dehydrogenation of n-butane to produce isobutene, etc. Generally all is to adopt bifunctional catalyst in the literature, and the catalyst used is basically the precious metal catalyst (J Catal.2000,190:373; J Catal.1998,177:60; Catal Lett.1998,55:173 carried by molecular sieves) ). The production of iso-olefins from n-alkanes can also be done by isomerizing n-alkanes to produce iso-alkanes, and then dehydrogenatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/076B01J37/03C07C5/22C07C11/02
Inventor 房德仁任万忠王涛王智艳刘波刘丽花张慧敏
Owner YANTAI UNIV
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