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Efficient CrOx/mesoporous CaO catalyst for preparing isobutene by oxidative dehydrogenation of iso-butane and preparation method thereof

A technology for oxidative dehydrogenation and isobutene production, which is applied in the field of catalysis, can solve problems such as no chromium oxide catalyst, and achieve the effect of good oxidation-reduction performance

Inactive Publication Date: 2010-01-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no report on the chromium oxide catalyst supported by mesoporous calcium oxide.

Method used

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  • Efficient CrOx/mesoporous CaO catalyst for preparing isobutene by oxidative dehydrogenation of iso-butane and preparation method thereof
  • Efficient CrOx/mesoporous CaO catalyst for preparing isobutene by oxidative dehydrogenation of iso-butane and preparation method thereof
  • Efficient CrOx/mesoporous CaO catalyst for preparing isobutene by oxidative dehydrogenation of iso-butane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Prepare mesoporous CaO carrier with reference to the method disclosed in CN101187055: dissolve 3.1g polyethylene glycol in 120mL deionized water, add 2.24g CaO powder, stir evenly at room temperature, transfer to autoclave and place in oven , hydrothermally treated at 240°C for 72 hours, the product was taken out and naturally cooled to room temperature, filtered, washed, and dried to obtain a white powder, which was put into a muffle furnace and raised from room temperature to Burn at 600°C for 5 hours to obtain CaO single crystal particles with wormhole-like mesoporous cubic crystal structure, that is, mesoporous CaO carrier, and dry at 100°C for 1 hour;

[0021] 2) Weigh 0.4386g of chromium nitrate and dissolve it in absolute ethanol equal in volume to 2.0000g of mesoporous CaO;

[0022] 3) Add the solution prepared in step 2) to 2.0000 g of the dried mesoporous CaO powder in step 1), and after fully stirring, dry at 120°C for 12 hours, grind the obtained powder e...

Embodiment 2

[0024] 1) with embodiment 1 step 1);

[0025] 2) Weigh 1.1700g of chromium nitrate and dissolve it in absolute ethanol equal in volume to 2.0000g of mesoporous CaO;

[0026] 3) Add the solution prepared in step 2) to 2.0000 g of the dried mesoporous CaO powder in step 1), and after fully stirring, dry at 120°C for 12 hours, grind the obtained powder evenly and transfer it to a muffle furnace, In the air atmosphere, the temperature was raised to 550°C at a rate of 1°C / min for 3 hours to obtain CrO x / mesoporous CaO catalyst, wherein, the active component CrO x The load of Cr 2 o 3 The mass percentage content of is counted as 10%.

Embodiment 3

[0028] 1) with embodiment 1 step 1);

[0029] 2) Weigh 1.4354g of chromium nitrate and dissolve it in absolute ethanol equal in volume to 2.0000g of mesoporous CaO;

[0030] 3) Add the solution prepared in step 2) to 2.0000 g of the dried mesoporous CaO powder in step 1), and after fully stirring, dry at 120°C for 12 hours, grind the obtained powder evenly and transfer it to a muffle furnace, In the air atmosphere, the temperature was raised to 550°C at a rate of 1°C / min for 3 hours to obtain CrO x / mesoporous CaO catalyst, wherein, the active component CrO x The load of Cr 2 o 3 The mass percent content of is calculated as 12%.

[0031] catalyst

[0032] Mesoporous CaO and CrO prepared by the present invention in table 1 x / Specific surface area, average pore diameter and pore volume of mesoporous CaO.

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Abstract

The invention discloses an efficient CrOx / mesoporous CaO catalyst for preparing isobutene by oxidative dehydrogenation of iso-butane and a preparation method thereof, and belongs to the field of catalysis. The prior catalyst for preparing the isobutene by the oxidative dehydrogenation of the iso-butane has the problems of low isobutene selectivity and the like. The catalyst provided by the invention uses mesoporous CaO as a carrier and uses CrOx as an active component, wherein x is 1 to 3; and the loading capacity of the CrOx active component is 4 to 12 percent in percentage by mass of Cr2O3. The preparation method comprises the following steps: dissolving soluble chromium salt into anhydrous ethanol, then adding the solution into the mesoporous CaO carrier, stirring the mixture evenly, and drying the mixture for 12 hours at 120 DEG C to obtain white solid powder; and heating the white solid powder to 550 DEG C at the rate of 1 DEG C per minute in air atmosphere in a muffle furnace, and firing the heated white solid powder for 3 hours at constant temperature to obtain the CrOx / mesoporous CaO catalyst. The CrOx / mesoporous CaO catalyst prepared by the method has high isobutene selectivity and high activity, and the preparation method has low cost and simple and convenient operation.

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to a kind of CrO for producing isobutene by oxidative dehydrogenation of isobutane with high efficiency x / Mesoporous CaO catalyst and preparation method thereof. Background technique [0002] Isobutene is an important chemical raw material. The traditional method of isobutane dehydrogenation to isobutene has low selectivity of the target product and easy deactivation of the catalyst due to problems such as high reaction temperature and easy carbon formation on the surface of the catalyst. The oxidative dehydrogenation of low-carbon alkanes is an exothermic reaction, which can be carried out at a lower temperature, and the introduction of oxygen can eliminate the carbon formation on the surface of the catalyst, so the strategy of oxidative dehydrogenation of isobutane to isobutene has attracted much attention . However, in the presence of oxygen, the target product (alkenes) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01J23/02C07C11/09C07C5/48
Inventor 戴洪兴刘彩欣张晗何洪訾学红
Owner BEIJING UNIV OF TECH
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