A kind of low-carbon alkane dehydrogenation catalyst containing skeleton silver and preparation method thereof

A dehydrogenation catalyst, a technology of low-carbon alkanes, applied in the directions of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of low catalyst stability and rapid deactivation, and achieve excellent catalyst activity stability, The effect of preventing crystal phase transformation and improving selectivity

Active Publication Date: 2016-06-15
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] For Cr currently used in Lummus's Catofin process 2 o 3 / Al 2 o 3 The disadvantages of low catalyst stability and rapid deactivation include the crystal phase transformation of the catalyst to a more stable crystal phase under the conditions of use

Method used

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  • A kind of low-carbon alkane dehydrogenation catalyst containing skeleton silver and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Aluminum hydroxide preparation. Take 3.5g of silver nitrate and dissolve it in 1L of 20% dilute nitric acid, and mix with Al 2 o 3 The concentration is 200g / L of sodium metaaluminate solution for neutralization, the neutralization temperature is 60°C, and the neutralization pH is 8.5. Aging for 1 hour after neutralization, then aging the slurry at pH 9.5 and temperature 60°C for 0.5 hour, filtering and washing, drying at 120°C for 8 hours, and crushing to obtain aluminum hydroxide powder A1.

[0042] Carrier Al 2 o 3 preparation. Mix a certain amount of aluminum hydroxide powder A1 with 8% of the mass fraction of aluminum oxide powder and turnip powder, then add citric acid with a mass concentration of 6% and dilute nitric acid with a mass concentration of 20% for kneading, kneading The time is 30 minutes, and finally it is molded on a molding machine. After the molded carrier is aired at room temperature for 8 hours, it is then dried at 120°C for 4 hours. The drie...

Embodiment 2

[0047] Aluminum hydroxide preparation. Dissolve 5.5g of silver nitrate and 600g of aluminum nitrate into 1L of solution, and mix with Al 2 o 3 The concentration is 200g / L of sodium metaaluminate solution for neutralization, the neutralization temperature is 30°C, and the neutralization pH is 10. Aging for 1 hour after neutralization, then aging the slurry for 1.5 hours at a pH of 10.5 and a temperature of 80°C, filtering and washing, drying at 120°C for 8 hours, and pulverizing to obtain aluminum hydroxide powder A2.

[0048] Carrier Al 2 o 3 The preparation was the same as in Example 1, using aluminum hydroxide A2 as the alumina raw material, and the water absorption rate of the prepared carrier was 57.9%.

[0049] Weigh 18g of chromium trioxide, 2.8g of potassium nitrate, and 3.2g of calcium nitrate, add 30ml of deionized water to make an impregnation solution, and weigh the carrier Al prepared above. 2 o 3 20g was supersaturated impregnated for 1 hour, then the impreg...

Embodiment 3

[0052] Aluminum hydroxide preparation. Dissolve 0.5g of silver nitrate and 800g of aluminum sulfate into 1L of solution, neutralize with 20% sodium hydroxide solution, the neutralization temperature is 40°C, and the neutralization pH is 6.5. After neutralization, the slurry was aged for 2 hours, and then the slurry was aged for 2.5 hours at a pH of 11.5 and a temperature of 50° C., filtered and washed, dried at 120° C. for 8 hours, and crushed to obtain aluminum hydroxide powder A3.

[0053] Carrier Al 2 o 3 The preparation was the same as in Example 1, using aluminum hydroxide A3 as the alumina raw material, and the water absorption rate of the prepared carrier was 59.4%.

[0054] Weigh 18g of chromium trioxide, 3.0g of magnesium nitrate, 2.9g of copper nitrate, add 30ml of deionized water to make an impregnation solution, weigh the carrier Al prepared above 2 o 3 20g was subjected to supersaturated impregnation for 1 hour, then the impregnated carrier was taken out, aire...

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Abstract

The invention is a low-carbon alkane dehydrogenation catalyst containing silver skeleton and its preparation method, characterized in that: the catalyst is composed of three parts: main active component, auxiliary agent and carrier, the main active component is chromium oxide, and the content 1-30wt%; the auxiliary agent is one or more of Na, K, Ca, Mg, Cu, Zr, Ce, Ag, and the oxide content of the auxiliary element is 0.01-10wt%; the rest is Ag-containing Alumina as a carrier: use impregnation method or co-impregnation method to load active metals and additives, then dry and calcinate to obtain a low-carbon alkane dehydrogenation catalyst containing skeleton silver.

Description

technical field [0001] The invention belongs to the field of catalyst preparation. The invention relates to a low-carbon alkane dehydrogenation catalyst containing skeleton silver and a preparation method thereof, in particular to a catalyst preparation method for improving the activity and stability of a low-carbon alkane dehydrogenation olefin catalyst. Background technique [0002] Among low-carbon olefins, propylene and isobutene are two important organic chemical raw materials, and their consumption is second only to ethylene. In addition to being used to produce polypropylene, propylene is also the main raw material for the production of acrylonitrile, butanol, octanol, propylene oxide, isopropanol, propylbenzene, acrylic acid, carbonyl alcohol and nonylphenol. Isobutylene is widely used in various organic chemical raw materials and fine chemicals such as synthetic rubber, butyl rubber and polyisobutylene. In the traditional process, the main source of these two low-...

Claims

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Application Information

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IPC IPC(8): B01J23/652B01J23/89C07C11/06C07C5/333
CPCY02P20/52
Inventor 杨玉旺高旭东戴清孙彦民于海斌
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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