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Preparation method for dehydrogenation catalyst

A dehydrogenation catalyst and catalyst technology, applied in the direction of chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of insignificant effect, poor recycling performance, etc., achieve high activity, reduce Operating cost, the effect of prolonging the one-way operation cycle

Active Publication Date: 2018-11-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problem of poor regeneration performance of Cr-based dehydrogenation catalysts, simply modifying the properties of the carrier is not effective.

Method used

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  • Preparation method for dehydrogenation catalyst
  • Preparation method for dehydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 200 mL each of deionized water and absolute ethanol, and mix well at room temperature. Weigh 45g of benzoic acid and dissolve in the above solvent, stir well and heat the solvent to 60°C in a water bath. Then add an appropriate amount of chromium oxalate to the above solution, stir until it is completely dissolved, then add an appropriate amount of lanthanum chloride, adjust the pH of the solution to 5 with dilute hydrochloric acid, and stir until it is completely dissolved.

[0028] Weigh 300mL γ-Al 2 o 3 The carrier is placed in a rotary evaporator, vacuumed for 30 minutes, then the above solution is impregnated and pumped into a rotary bottle, and the carrier is impregnated for 8 hours under normal pressure. Evaporate the impregnation solution at 80°C to dryness, unload the catalyst, put it in an oven to dry at 120°C for 5 hours, and put it into a muffle furnace for calcination at 550°C for 4 hours.

[0029] The above-mentioned catalyst is then impregnated wi...

Embodiment 2

[0044] Take 200mL of deionized water and 240mL of absolute ethanol, and mix well at room temperature. Weigh 55g of benzoic acid and dissolve it in the above solvent, stir well and heat the solvent to 70°C in a water bath. Then add an appropriate amount of chromium oxalate to the above solution, stir until it is completely dissolved, then add an appropriate amount of lanthanum chloride, adjust the pH of the solution to 5.5 with dilute hydrochloric acid, and stir until it is completely dissolved.

[0045] Weigh 280mL γ-Al 2 o 3 The carrier is placed in a rotary evaporator, vacuumed for 30 minutes, then the above solution is impregnated and pumped into a rotary bottle, and the carrier is impregnated for 6 hours under normal pressure. Evaporate the impregnating solution at 75°C to dryness, unload the catalyst, put it in an oven to dry at 110°C for 4 hours, and put it into a muffle furnace for calcination at 600°C for 4 hours.

[0046] The above catalyst is impregnated with an a...

Embodiment 3

[0048] Take 250mL of deionized water and 190mL of absolute ethanol, and mix well at room temperature. Weigh 39g of benzoic acid and dissolve in the above solvent, stir well and heat the solvent to 75°C in a water bath. Then add an appropriate amount of chromium oxalate to the above solution, stir until it is completely dissolved, then add an appropriate amount of lanthanum chloride, adjust the pH of the solution to 4.6 with dilute hydrochloric acid, and stir until it is completely dissolved.

[0049] Weigh 260mL γ-Al 2 o 3 The carrier was placed in a rotary evaporator, vacuumed for 30 minutes, then the above solution was impregnated and pumped into a rotary bottle, and the carrier was impregnated for 5 hours under normal pressure. Evaporate the impregnating solution at 80°C, unload the catalyst, dry in an oven at 110°C for 6 hours, and then put it in a muffle furnace for 3 hours at 560°C.

[0050] The above-mentioned catalyst is then impregnated with an aqueous solution of ...

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Abstract

The invention discloses a preparation method for a dehydrogenation catalyst. The method comprises the following steps: (1) enabling soluble salt of Cr and soluble salt of La to be dissolved in benzoicacid solution, to obtain impregnation liquid containing Cr and La; and (2) dipping a carrier by using the impregnation liquid obtained in the step (1), drying, roasting, to obtain the dehydrogenationcatalyst. In the catalyst prepared by the method, the substance Cr stably exists on the surface of the aluminum oxide carrier, after the catalyst is recycled and regenerated for many times, the catalyst still has the higher dehydrogenation activity. The substance Cr largely exists in pore canals with larger pore diameters, and the substance Cr still has the higher activity under a higher carbon deposition quantity. A one-way running period of the catalyst is prolonged, and the operating cost of the device is reduced.

Description

technical field [0001] The invention relates to a preparation method of a low-carbon alkane dehydrogenation catalyst, in particular to a preparation method of a Cr-based dehydrogenation catalyst. Background technique [0002] The development of shale gas in North America has led to a sharp decline in natural gas prices relative to crude oil prices, while the production of large condensate liquids (NGLs) in shale gas has also increased rapidly. Shale gas condensate is rich in low-carbon alkanes such as ethane, propane, and butane. Ethane can be used as a cracking raw material to produce ethylene. Therefore, FCC technology alone cannot meet the rapidly growing demand for propylene. Dehydrogenation of low-carbon alkanes in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce low-carbon olefins is an effective way to solve this problem. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has ...

Claims

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Application Information

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IPC IPC(8): B01J23/86B01J23/26C07C5/333C07C11/04C07C11/06C07C11/08
CPCB01J23/002B01J23/26B01J23/868B01J2523/00C07C5/3332B01J2523/17B01J2523/31B01J2523/3706B01J2523/67B01J2523/13B01J2523/32C07C11/04C07C11/06C07C11/08Y02P20/52Y02P20/584
Inventor 王振宇郑步梅张淑梅
Owner CHINA PETROLEUM & CHEM CORP
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