Low carbon alkane dehydrogenation catalyst for alkene production and its preparation method and application

A technology of low-carbon alkanes and catalysts, which is applied in the field of low-carbon alkanes dehydrogenation to olefins catalysts and its preparation, and can solve the problems of complex preparation process and high content of chromium oxide in active components

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this method is relatively complicated, and the content of the active component chromium o...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Select spherical γ-Al with a diameter of 1.5~3mm 2 o 3 The precursor of chromium selected for loading chromium oxide is chromic acid. Immerse in chromic acid solution at room temperature for 5 hours, then dry at 120°C for 5 hours, and bake at 600°C for 4 hours. The content of the loaded active component chromium oxide is 70% of the total chromium content in the final catalyst. Potassium oxide is loaded on the carrier loaded with active component chromium, soaked at room temperature for 5 hours, dried at 120°C for 2 hours, and calcined at 540°C for 3 hours. The carrier loaded with potassium oxide continued to load the active component chromium, soaked in chromic acid solution at room temperature for 5 hours, dried at 120°C for 5 hours, and calcined at 600°C for 4 hours to prepare the catalyst as A. The mass of chromium oxide in the prepared catalyst accounts for 15% of the total mass of the catalyst, and the mass of potassium oxide accounts for 1% of the total mass of...

example 2

[0025] Select spherical γ-Al with a diameter of 1.5~3mm 2 o 3 The chromium precursor selected for loading chromium oxide is chromium nitrate. Immerse in chromium nitrate solution at room temperature for 5 hours, then dry at 120°C for 5 hours, and bake at 600°C for 4 hours. The content of the loaded active component chromium oxide is 65% of the total chromium content in the final catalyst. Sodium oxide is loaded on the carrier loaded with active component chromium, soaked at room temperature for 5 hours, dried at 120°C for 2 hours, and calcined at 540°C for 3 hours. The carrier loaded with sodium oxide continued to load the active component chromium, impregnated with chromium nitrate solution at room temperature for 5 hours, dried at 120°C for 5 hours, and calcined at 600°C for 4 hours to prepare the catalyst as C. The mass of chromium oxide in the prepared catalyst accounts for 21% of the total mass of the catalyst, and the mass of sodium oxide accounts for 1.5% of the tota...

example 3

[0027] Select spherical γ-Al with a diameter of 1.5~3mm 2 o 3 The chromium precursor selected for loading chromium oxide is chromium acetate. Immerse in chromium acetate solution at room temperature for 5 hours, then dry at 120°C for 5 hours, and bake at 600°C for 4 hours. The content of the loaded active component chromium oxide is 80% of the total chromium content in the final catalyst. Lithium oxide is loaded on the carrier loaded with active component chromium, soaked at room temperature for 5 hours, dried at 120°C for 2 hours, and calcined at 540°C for 3 hours. The carrier loaded with lithium oxide continued to support the active component chromium, and the catalyst prepared by immersing in chromium acetate solution at room temperature for 5 hours, drying at 120°C for 5 hours, and calcining at 600°C for 4 hours was designated as D. The mass of chromium oxide in the prepared catalyst accounts for 27% of the total mass of the catalyst, and the mass of lithium oxide accou...

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Abstract

The invention discloses a low carbon alkane dehydrogenation catalyst for alkene production and its preparation method and application. The catalyst uses Al2O3 (alumina) as a carrier, chromium as an active component, and an alkali metal as an assistant catalyst component, taking to the final catalyst weight as the base, the chromium oxide content is 10.0%-30.0%, the alkali metal oxide content is 0.5%-3.0%, and the rest is the alumina. The active component chromium is stepwise impregnated onto the alumina carrier before and after impregnation of the alkali metal assistant catalyst component. The low carbon alkane dehydrogenation catalyst for alkene production is used in dehydrogenation of propane to produce propylene. The low carbon alkane dehydrogenation catalyst for alkene production has high activity stability and propylene selectivity, and the preparation method is simple, and is suitable for industrial applications.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation olefin catalyst and its preparation method and application, in particular to a C3-C4 alkane dehydrogenation olefin catalyst and its preparation method and application. Background technique [0002] In recent years, with the rapid development of the global petrochemical industry, the demand for low-carbon olefins is also increasing. The catalytic dehydrogenation technology of light alkanes is an effective way to increase the production of C3~C4 olefins. At present, the low-carbon alkane dehydrogenation technologies in the world include: UOP’s Oleflex process, ABB Lummus’s Catofin process, ConocoPhillips (Uhde)’s Star process, Snamprogetti / Yarsintz’s FBD-4 process, Linde / BASF's PDH process, etc. Among the devices already built, most of the former Soviet Union adopted the FBD-4 process, while the Catofin and Oleflex processes have become the dominant processes used in new plants. The Oleflex...

Claims

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Application Information

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IPC IPC(8): B01J23/26C07C5/333C07C11/06
CPCY02P20/52
Inventor 王振宇李江红张海娟张喜文
Owner CHINA PETROLEUM & CHEM CORP
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