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Carbon-alumina supported copper oxide catalyst, preparation method and applications thereof

An alumina supported, copper oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of easy carbon deposition and decreased catalyst activity, etc. Achieve the effect of reducing carbon deposition, improving mechanical strength and good catalyst stability

Inactive Publication Date: 2015-11-04
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of the alumina carrier has a certain degree of hydrophilicity, and it is easy to deposit carbon, resulting in a decrease in catalyst activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Porous alumina (specific surface area is about 210m 2 / g) impregnated with sucrose solution (sucrose:alumina weight ratio is 0.9:1), then dried at 120°C for 12h, then calcined and carbonized at 800°C for 1h under the protection of nitrogen to obtain C-Al 2 o 3 Composite carrier, the content of carbon is 5.0wt%. Dissolve 2.42g of copper nitrate and 1.02g of citric acid in 400mL of water, stir at room temperature to form a solution, and add the prepared C-Al to the above solution 2 o 3 Composite carrier 19.12g, stirred and dried in a constant temperature water bath at 60°C, and calcined at 650°C for 5h to obtain the carbon-alumina supported copper oxide catalyst CuO / C-Al 2 o 3 , wherein the mass percentage of CuO is 4.0%. The prepared CuO / C-Al 2 o 3 The catalyst is loaded into a fixed bed reactor, and a mixed gas of isobutane and carbon dioxide with a mass ratio of 1:5 is passed through preheated to 330°C, at 0.1MPa and a space velocity of 4L / (g cat h) and a react...

Embodiment 2

[0026] Porous alumina (specific surface area is about 200m 2 / g) into C 6 h 6 / N 2 (25°C saturated steam) gas flow, vapor deposition at 725°C for 1h, to obtain C-Al 2 o 3 Composite carrier, the content of carbon is 15.2wt%. Dissolve 1.82g of copper acetate and 2.10g of citric acid in 350mL of water, stir at room temperature to form a solution, and add the prepared C-Al to the above solution 2 o 3 7.17g of the composite carrier was stirred and dried in a constant temperature water bath at 70°C, and calcined at 650°C for 5 hours to obtain the carbon-alumina-supported copper oxide catalyst CuO / C-Al 2 o 3 , wherein the mass percentage of CuO is 10.0%. The prepared CuO / C-Al2 o 3 The catalyst is loaded into a fixed bed reactor, and a mixed gas of isobutane and carbon dioxide with a mass ratio of 1:5 is passed through preheated to 330°C, at 0.1MPa and a space velocity of 6L / (g cat h) and a reaction temperature of 555°C, the conversion rate of isobutane was measured to be 43...

Embodiment 3

[0028] Porous alumina (specific surface area is about 200m 2 / g) Immerse furfuryl alcohol and ethanol solution in equal volume at room temperature (0.5mL furfuryl alcohol: 1g Al 2 o 3 ), then polymerized at 95°C, and under the protection of nitrogen, calcined and carbonized at 800°C for 1h to obtain C-Al 2 o 3 Composite carrier, the content of carbon is 20.1wt%. Dissolve 2.66g of copper sulfate and 3.72g of citric acid in 450mL of water, stir at room temperature to form a solution, and add the prepared C-Al 2 o 3 6.51g of the composite carrier was dried in a constant temperature water bath at 80°C and calcined at 600°C for 7 hours to obtain the carbon-alumina-supported copper oxide catalyst CuO / C-Al 2 o 3 , wherein the mass percentage of CuO is 15.5%. The prepared CuO / C-Al 2 o 3 The catalyst is loaded into a fixed bed reactor, and a mixed gas of isobutane and carbon dioxide with a mass ratio of 1:6 is passed through which is preheated to 420°C. At 0.2MPa and a space v...

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Abstract

The present invention discloses a carbon-alumina supported copper oxide catalyst and a preparation method thereof, and applications of the carbon-alumina supported copper oxide catalyst in isobutene preparation through isobutane dehydrogenation, wherein the carbon-alumina supported copper oxide catalyst comprises 4.0-25.0% by mass of an active component copper oxide and the balance of a carbon-alumina composite carrier. According to the present invention, the carbon-alumina supported copper oxide catalyst has characteristics of high isobutane conversion rate, high isobutene selectivity and good stability, wherein the isobutane conversion rate can achieve 35.2-55.4%, the isobutene selectivity can achieve 80.4-92.5%, and the catalyst activity is reduced by 1.5-6.5% after the reaction for 3-5 h; and the catalyst does not use the precious metal and the toxic chromium-based metal oxide, and the method has characteristics of low cost, environmental protection and simple preparation, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a supported catalyst for dehydrogenation, in particular to a carbon-alumina supported copper oxide catalyst and a preparation method thereof, as well as its application in preparing isobutene from isobutane dehydrogenation. Background technique [0002] Isobutylene is an important organic chemical raw material. It can not only be used to synthesize butyl rubber, isoprene rubber and polyisobutylene rubber elastomer, but also can be used to produce various fine chemicals such as methyl methacrylate and tert-butyl alcohol. . The traditional sources of isobutene mainly come from naphtha cracking ethylene units and fluid catalytic cracking units of oil refineries. With the continuous development of isobutene downstream products and its derivatives, the demand for isobutene is also increasing, and traditional sources have been difficult to meet. Market demand. For this reason, new isobutene production technologies have been continu...

Claims

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Application Information

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IPC IPC(8): B01J23/72C07C5/333C07C11/09
Inventor 李泽壮刘经伟陈韶辉杨爱武李晓强柏基业刘丽娟王英武
Owner SINOPEC YANGZI PETROCHEM
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