Nanometer grade low carbon paraffin dehydrogen catalyst

A dehydrogenation catalyst, a technology for low-carbon alkanes, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low conversion rate, high reaction temperature, low selectivity, etc.

Inactive Publication Date: 2007-02-14
DAQING PETROLEUM ADMINISTRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a nano-scale low-carbon alkane dehydrogenation catalyst, which has a simple method and a reasonable process, and solves the technical problems of high optimal reaction temperature, low conversion rate and low selectivity of previous dehydrogenation catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Catalyst 15% Cr 2 O 3 -30% Al 2 O 3 -Preparation of carbon nanotubes

[0016] (a) Weigh 1 gram of single-wall or multi-wall carbon nanotubes with a diameter of 3-30 nm, wash and heat them in an acid solution, and use ultrasonic vibration to disperse them.

[0017] (b) Weigh 0.8 grams of Cr(NO 3 ) 3 ·9H 2 O, 2.2 grams of Al(NO 3 ) 3 ·9H 2 O. Prepare a 0.02M aqueous solution and add the carbon nanotubes described in (a).

[0018] (c) Weigh (NH 4 ) 2 CO 3 ·H 2 1.47 grams of O or ammonia (or urea), add water to make a 0.02M aqueous solution, fully dissolve it, and use this solution to titrate the above nitrate solution with sufficient stirring. After the titration, continue to stir for 7.5 hours. The result of this reaction is the formation of Al(OH) 3 And Cr(OH) 3 precipitation. The reaction equation is:

[0019]

[0020]

[0021] (d) Wash the formed precipitate with distilled water several times and perform suction filtration. The resulting precipitate was dried ...

Embodiment 2

[0032] 1. Catalyst 8%Cr 2 O 3 -25% Al 2 O 3 -Preparation of carbon nanotubes

[0033] (a) Weigh 1 gram of single-wall or multi-wall carbon nanotubes with a diameter of 3-30 nm, wash and heat them in an acid solution, and use ultrasonic vibration to disperse them.

[0034] (b) Weigh 0.42 grams of Cr(NO 3 ) 3 ·9H 2 O, 1.8 grams of Al(NO 3 ) 3 ·9H 2 O. Prepare a 0.02M aqueous solution and add the carbon nanotubes described in (a).

[0035] (c) Weigh (NH 4 ) 2 CO 3 ·H 2 1.3 g of O or ammonia (or urea), add water to make a 0.02M aqueous solution, fully dissolve it, and use this solution to titrate the above nitrate solution with sufficient stirring. After the titration, continue to stir for 7.5 hours. The result of this reaction is the formation of Al(OH) 3 And Cr(OH) 3 precipitation. The reaction equation is:

[0036]

[0037]

[0038] (d) Wash the formed precipitate with distilled water several times and perform suction filtration. The resulting precipitate was dried at 100°...

Embodiment 3

[0049] 1. Catalyst 25% Cr 2 O 3 -8% Al 2 O 3 -Preparation of carbon nanotubes

[0050] (a) Weigh 1 gram of single-walled or multi-walled carbon nanotubes with a diameter of 3-30 nm, wash and heat them in an acid solution, and use ultrasonic vibration to disperse them.

[0051] (b) Weigh 1.31 grams of Cr(NO 3 ) 3 ·9H 2 O, 0.59g Al(NO 3 ) 3 ·9H 2 O. Prepare a 0.02M aqueous solution and add the carbon nanotubes described in (a).

[0052] (c) Weigh (NH 4 ) 2 CO 3 ·H 2 1.08 grams of O or ammonia (or urea), add water to make a 0.02M aqueous solution, fully dissolve it, and use this solution to titrate the above nitrate solution with sufficient stirring. After the titration, continue to stir for 6 hours. The result of this reaction is the formation of Al(OH) 3 And Cr(OH) 3 precipitation. The reaction equation is:

[0053]

[0054]

[0055] (d) Wash the formed precipitate with distilled water several times and perform suction filtration. The resulting precipitate was dried at 12...

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Abstract

The present invention relates to one kind of nanometer level low carbon alkane dehydrogenating catalyst, and features that the C3-C5 low carbon alkane dehydrogenating catalyst comprises carrier of single wall or multiple wall carbon nanotube and two active components selected from chromic oxide in 2-30 wt%, alumina in 2-25 weight and nickel oxide in 2-30 wt%. The catalyst has high catalysis activity, increased active structures, long service life, low catalytic dehydrogenation reaction temperature, high conversion rate, high selectivity and other advantages.

Description

Technical field: [0001] The invention relates to a low-carbon alkane dehydrogenation catalyst, belonging to a nano-level low-carbon alkane dehydrogenation catalyst. Background technique: [0002] At present, there is no ideal catalyst for the decarbonization of low-carbon alkane. In the past, the dehydrogenation catalysts for low-carbon alkane have the problems of high dehydrogenation temperature, poor conversion rate and relatively poor selectivity. In addition, noble metals are often used as active substances, the cost of the catalyst is high, and the use conditions are harsh. In particular, the dehydrogenation catalytic process of carbon 5 is complicated and difficult. The existing catalysts have poor selectivity and low conversion rate of alkanes. For example, the selectivity of butane to isobutylene is only 40-45%, the selectivity is 79%, and the operation time is 10-20 days. The special catalyst for carbon 5 dehydrogenation process is basically The above is blank. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01J21/04B01J21/18B01J23/835
Inventor 于振兴张晓丽石群孙启权张平
Owner DAQING PETROLEUM ADMINISTRATION
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