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A kind of method for preparing CO2 oxidation ethylbenzene dehydrogenation catalyst by pyrolysis of nitrogen-containing compound

A nitrogen compound and ethylbenzene dehydrogenation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, hydrocarbons, etc., to achieve low synthesis temperature, good stability, and simple operation Effect

Active Publication Date: 2016-04-06
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the existing 2 The shortcomings of the catalyst preparation method for the dehydrogenation of ethylbenzene oxide, to provide a simple, economical, short reaction time, low synthesis temperature, uniform catalyst preparation method

Method used

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  • A kind of method for preparing CO2 oxidation ethylbenzene dehydrogenation catalyst by pyrolysis of nitrogen-containing compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to the composition of the catalyst is 6% V 2 o 5 -Al 2 o 3 , add 0.2302g of ammonium metavanadate and 20.6322g of aluminum nitrate nonahydrate into 100mL of 0.1% oxalic acid aqueous solution, stir until the solid is completely dissolved, add 12.5540g of ammonium carbonate, stir until evenly mixed, the nitrate in the resulting mixture The ratio of the molar amount of ammonium carbonate to the molar amount of ammonium carbonate is 1:0.5, the temperature is raised to 50°C, stirred at a constant temperature for 10 hours, and then heated to 200°C for 20 minutes, and then the temperature is raised to 550°C at a rate of 2°C / min. Calcined for 4 hours, naturally cooled to normal temperature, pressed into tablets, granulated, and passed through a 40-60 mesh sieve to prepare a catalyst.

Embodiment 2

[0015] In Example 1, the ammonium carbonate used was replaced with equimolar ammonium bicarbonate, and the other steps were the same as in Example 1 to prepare a catalyst.

Embodiment 3

[0017] In Example 1, the ammonium carbonate used was replaced with equimolar ammonium nitrate, and the other steps were the same as in Example 1 to prepare a catalyst.

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Abstract

The invention discloses a method for preparing a dehydrogenation catalyst for CO2 oxidizing ethylbenzene by thermal decomposition of nitrogen-containing compounds. The active ingredient of the catalyst is V2O5, the auxiliary ingredient of the catalyst is Al2O3 or a compound of Al2O3 and any one of CeO2, ZrO2 and cerium-zirconium composite oxide, and the catalyst is prepared by adopting ammonium carbonate, ammonium bicarbonate, ammonium nitrate, ammonium hydroxide, ammonium chloride or hydrazine as fuel and adopting a combustion decomposition method. The method disclosed by the invention has the advantages that the operation is convenient, the reaction time is short, the synthesis temperature is low, and equipment is simple; the prepared catalyst is uniform in dispersion, is used for catalyzing dehydrogenation of CO2 oxidizing ethylbenzene to prepare styrene; the conversion rate of ethylbenzene and the selectivity of styrene are high and the stability of the catalyst is good.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a method for preparing CO 2 Process for oxidizing ethylbenzene dehydrogenation catalysts. Background technique [0002] Styrene is one of the most important monomers in petrochemical products, and is mainly used as a raw material for the production of plastics, resins and synthetic rubber. Currently, about 90% of styrene in the market is produced by direct dehydrogenation of ethylbenzene. This method has high reaction temperature, difficult recovery of latent heat of water vapor and large energy consumption. Therefore, under the condition of energy shortage in the new century, it is urgent to develop a new process. According to literature reports, the oxidative dehydrogenation of ethylbenzene can break the thermodynamic equilibrium limit, solve the self-heating problem and reduce the reaction temperature, which can be used as a promising alternative method. Howev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22C07C15/46C07C5/42
Inventor 刘忠文杨慧宁任花萍王欢宋永红刘昭铁
Owner SHAANXI NORMAL UNIV
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