Low-carbon alkane dehydrogenation catalyst and preparation method thereof

A technology for dehydrogenation catalysts and low-carbon alkanes, applied in catalyst activation/preparation, hydrocarbons, hydrocarbons, etc., can solve problems such as limited carbon capacity and limited loading of active components, and achieve carbon capacity Enhance, enhance the anti-coke ability, reduce the effect of regeneration times

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this patent, the chromium oxide is still all on the formed alumina matrix, impregnated by impregnation method, and there are still problems of limited loading of active components and limited carbon capacity.

Method used

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  • Low-carbon alkane dehydrogenation catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 75.03gCr(NO 3 ) 3 9H 2 O was dissolved in deionized water and fully stirred to prepare 18.0% (weight concentration) Cr(NO 3 ) 3 aqueous solution.

[0025] (2) prepare the KNO of 3.86% (weight concentration) 3 aqueous solution.

[0026] (3) 55g of pseudo-boehmite, 2.2g of bentonite and 28.92g of Cr(NO 3 ) 3 The aqueous solution is fully mixed, kneaded, made into a plastic body and extruded into small balls. Then dry at 120°C for 3 hours, place the dried sample in a high-temperature furnace, raise the temperature to 280°C at a rate of 2°C / min, and keep the temperature constant for 1 hour. Then the temperature was raised to 500° C. at a rate of 2° C. / min, and the temperature was kept constant for 3 hours. Finally, the temperature was increased to 620° C. at a rate of 2° C. / min, and the temperature was constant for 2 hours. Finally, under the atmosphere of 20% (volume) water and 80% (volume) air, it was calcined at 760°C for 4 hours to prepare carrier A1...

Embodiment 2

[0029] (1) Weigh 117.5gCrO 3 (Purity 99.8%) was dissolved in deionized water and stirred fully to prepare 47.0% (weight concentration) CrO 3 aqueous solution.

[0030] (2) prepare the KNO of 3.86% (weight concentration) 3 aqueous solution.

[0031] (3) 55g pseudo-boehmite, 2.2g bentonite and 4.19g step (1) prepared CrO 3 The aqueous solution is fully mixed, kneaded, made into a plastic body and extruded into small balls. Then dry at 100°C for 5 hours, place the dried sample in a high-temperature furnace, raise the temperature to 260°C at a rate of 2°C / min, and keep the temperature constant for 3 hours. Then the temperature was raised to 530° C. at a rate of 2° C. / min, and the temperature was kept constant for 3 hours. Finally, the temperature was increased to 640° C. at a rate of 2° C. / min, and the temperature was constant for 2 hours. Finally, under the atmosphere of 30% water (volume) and 70% (volume) air, it was calcined at 720°C for 3 hours to prepare carrier A2, in ...

Embodiment 3

[0034] (1) Weigh 117.5gCrO 3 (purity 99.8%) dissolved in deionized water and fully stirred to prepare 47% (weight concentration) CrO3 aqueous solution.

[0035] (2) prepare the KNO of 3.86% (weight concentration) 3 aqueous solution.

[0036] (3) 55g of pseudo-boehmite, 2.2g of bentonite and 2.09g of CrO prepared in step (1) 3 The aqueous solution is fully mixed, kneaded, made into a plastic body and extruded into small balls. Then dry at 140°C for 2 hours, place the dried sample in a high-temperature furnace, raise the temperature to 300°C at a rate of 2°C / min, and keep the temperature constant for 1 hour. Then the temperature was raised to 480° C. at a rate of 2° C. / min, and the temperature was kept constant for 5 hours. Finally, the temperature was increased to 620° C. at a rate of 2° C. / min, and the temperature was constant for 4 hours. Finally, under the atmosphere of 15% water (volume) and 85% (volume) air, it was calcined at 700°C for 5 hours to prepare carrier A3, ...

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Abstract

The invention discloses a low-carbon alkane dehydrogenation catalyst and a preparation method thereof. The catalyst is prepared from chromium serving as an active metal ingredient, alkali metal serving as an auxiliary catalytic ingredient and chromium-containing aluminum oxide serving as a carrier, wherein the weight content of the chromium oxide in the carrier is 2.0 to 15.0 percent. In the method, the active metal ingredient, namely chromium, is introduced into the aluminum oxide carrier by partially using a kneading method and partially using an immersion method; pseudo-boehmite mixed withchromium is processed by adopting a three-step roasting method and a hydrothermal method; and thus, the porous structure and the surface character of the carrier can be improved, the content and the distribution of the active metal chromium in the carrier and the mutual effect between the active metal and the aluminum oxide are further modulated, the activity and the stability of the catalyst areimproved, the carbon depositing resistance of the catalyst is enhanced, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation catalyst and a preparation method thereof, in particular to a catalyst for the catalytic reaction of propane dehydrogenation to propylene and a preparation method thereof. Background technique [0002] Since the beginning of the new century, human demand for the world's petrochemical raw materials and petrochemical products will continue to grow, and the demand for propylene as the basic petrochemical raw material will continue to grow. However, traditional conventional methods can no longer meet the rapidly growing demand, making the market a global market. shortage. And with the increasing scarcity of petroleum resources, the production of propylene has changed from purely relying on petroleum as a raw material to diversifying the technical route of raw materials, especially the technical route of producing propylene with low-carbon alkanes as raw materials. In recent years, the technology...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26B01J37/04B01J37/02C07C11/06C07C5/333
CPCY02P20/52
Inventor 李江红张海娟金亮张喜文宋喜军
Owner CHINA PETROLEUM & CHEM CORP
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