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Low-carbon alkane dehydrogenation catalyst and preparation method thereof

A technology for dehydrogenation catalysts and low-carbon alkanes, which is used in catalyst activation/preparation, hydrocarbons, hydrocarbons, etc., which can solve the problems of limited loading of active components and limited carbon capacity, and achieve enhanced anti-accumulation. The effect of carbon capacity, carbon capacity enhancement, improvement of pore structure and surface properties

Active Publication Date: 2011-01-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 is dissolved in deionized water and stirred fully to prepare 18.0% (weight concentration) Cr(NO 3 ) 3 Aqueous solution.

[0025] (2) Prepare 3.86% (weight concentration) KNO 3 Aqueous solution.

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

Embodiment 2

[0029] (1) Weigh 117.5gCrO 3 (Purity 99.8%) Dissolve in deionized water and stir well to prepare 47.0% (weight concentration) CrO 3 Aqueous solution.

[0030] (2) Prepare 3.86% (weight concentration) KNO 3 Aqueous solution.

[0031] (3) Combine 55g pseudo-boehmite, 2.2g bentonite and 4.19g CrO prepared in step (1) 3 The aqueous solution is fully mixed and kneaded to form a plastic body and then extruded into a small ball. Then, it was dried at 100°C for 5 hours, and the dried sample was placed in a high-temperature furnace, heated to 260°C at a rate of 2°C / min, and kept at a constant temperature for 3 hours. Then the temperature is increased to 530°C at a rate of 2°C / min, and the temperature is kept constant for 3 hours. Finally, it was raised to 640°C at a rate of 2°C / min, and baked at a constant temperature for 2 hours. Finally, it is calcined at 720°C for 3 hours in an atmosphere of 30% water (volume) and 70% (volume) air to prepare carrier A2, in which Cr 2 O 3 The weight con...

Embodiment 3

[0034] (1) Weigh 117.5gCrO 3 (Purity 99.8%) Dissolve in deionized water and stir well to prepare 47% (weight concentration) CrO 3 Aqueous solution.

[0035] (2) Prepare 3.86% (weight concentration) KNO 3 Aqueous solution.

[0036] (3) Combine 55g pseudo-boehmite, 2.2g bentonite and 2.09g step (1) the prepared CrO 3 The aqueous solution is fully mixed and kneaded to form a plastic body and then extruded into a small ball. Then, it was dried at 140°C for 2 hours, and the dried sample was placed in a high-temperature furnace, heated to 300°C at a rate of 2°C / min, and kept at a constant temperature for 1 hour. Then the temperature is increased to 480°C at a rate of 2°C / min, and the temperature is kept constant for 5 hours. Finally, it was raised to 620°C at a rate of 2°C / min, and baked at a constant temperature for 4 hours. Finally, it is calcined at 700°C for 5 hours in an atmosphere of 15% water (volume) and 85% (volume) air to prepare carrier A3, in which Cr 2 O 3 The weight conte...

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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 with chromium 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 are improved, 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 petrochemical raw materials and petrochemical products in the world will continue to grow. The demand for propylene, the basic petrochemical raw material, will continue to grow. However, traditional conventional methods can no longer meet the rapidly growing demand, making the market appear global. The shortage. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has shifted from relying solely on petroleum as a raw material to a diversified technical route of raw materials, especially the technical route of preparing propylene from low-carbon alkanes. In recent years, the technology of producing propyle...

Claims

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Application Information

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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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