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Method for preparing ethylbenzene dehydrogenation catalyst by utilizing spherical nanometer alpha-ferric oxide as iron source

An ethylbenzene dehydrogenation and catalyst technology, which is applied in metal/metal oxide/metal hydroxide catalysts, carbon compound catalysts, physical/chemical process catalysts, etc., can solve the problems of low stability and low catalyst activity, and achieves Improve stability, high activity, increase the effect of dispersion

Active Publication Date: 2019-07-12
TIANJIN UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] One of the technical problems to be overcome by the present invention is to overcome the shortcomings of low catalyst activity and low stability in the previous literature, and provide a new catalyst for ethylbenzene dehydrogenation, which has high stability and high selectivity

Method used

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  • Method for preparing ethylbenzene dehydrogenation catalyst by utilizing spherical nanometer alpha-ferric oxide as iron source
  • Method for preparing ethylbenzene dehydrogenation catalyst by utilizing spherical nanometer alpha-ferric oxide as iron source
  • Method for preparing ethylbenzene dehydrogenation catalyst by utilizing spherical nanometer alpha-ferric oxide as iron source

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Mix 30g of ferric nitrate with deionized water, stir and fully dissolve to make a 1mol / L solution. Then add 200ml of 1mol / L urea and stir for 3h to form a gel. The gel substance was aged for 6 hours and dried at 95° C. for 20 hours to obtain an iron oxide precursor. The iron oxide precursor was calcined at 550 °C for 4 h in a muffle furnace. Obtain nano-iron oxide.

[0041] (2) Dissolve 15 g of cerium nitrate in deionized water and mix with 12 mol / L sodium hydroxide. After magnetic stirring for 30 minutes, the pH was adjusted to 2-6 with nitric acid to form white flocs. Put the solution into a polytetrafluoroethylene liner and keep it warm at 160°C for 18h. After hydrothermal pressure treatment, the sample was separated by centrifugation, and then washed several times with deionized water and absolute ethanol solution respectively. Finally, the washed samples were dried in a drying oven at 60 °C for 24 h.

[0042] (3) 67.1g of iron oxide powder and 7.5g of cer...

Embodiment 2

[0045] (1) Mix 30g of ferric nitrate with deionized water, stir and fully dissolve to make a 2mol / L solution. Then add 165ml of 1mol / L urea and stir for 3h to form a gel. The gel substance was aged for 6 hours and dried at 95° C. for 20 hours to obtain an iron oxide precursor. The iron oxide precursor was calcined at 550 °C for 4 h in a muffle furnace. Obtain nano-iron oxide.

[0046] (2) Dissolve 15 g of cerium nitrate in deionized water, and mix with 16 mol / L sodium hydroxide. After magnetic stirring for 30 minutes, the pH was adjusted to 2-6 with nitric acid to form white flocs. Put the solution into a polytetrafluoroethylene liner and keep it warm at 160°C for 18h. After hydrothermal pressure treatment, the sample was separated by centrifugation, and then washed several times with deionized water and absolute ethanol solution respectively. Finally, the washed samples were dried in a drying oven at 60 °C for 24 h.

[0047] (3) 67.1g of iron oxide powder and 7.5g of ce...

Embodiment 3

[0050](1) Mix 30g of ferric nitrate with deionized water, stir and fully dissolve to make a 1mol / L solution. Then add 140ml of 2mol / L urea and stir for 3h to form a gel. The gel substance was aged for 6 hours and dried at 95° C. for 20 hours to obtain an iron oxide precursor. The iron oxide precursor was calcined at 550 °C for 4 h in a muffle furnace. Obtain nano-iron oxide.

[0051] (2) Dissolve 15 g of cerium nitrate in deionized water and mix it with 18 mol / L sodium hydroxide. After magnetic stirring for 30 minutes, the pH was adjusted to 2-6 with nitric acid to form white flocs. Put the solution into a polytetrafluoroethylene liner and keep it warm at 160°C for 18h. After hydrothermal pressure treatment, the sample was separated by centrifugation, and then washed several times with deionized water and absolute ethanol solution respectively. Finally, the washed samples were dried in a drying oven at 60 °C for 24 h.

[0052] (3) 67.1g of iron oxide powder and 7.5g of c...

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Abstract

The invention relates to a method for preparing an ethylbenzene dehydrogenation catalyst by utilizing spherical nanometer alpha-ferric oxide as an iron source. The method comprises the following steps: mixing 50-75nm spherical alpha-ferric oxide and cerium oxide to obtain metastable suspension; slowly pouring a certain number of erbium nitrate, potassium carbonate and a mixed solution of one or two rare earth metallic oxide into the suspension; regulating the pH to be 9-12 through ammonium hydroxide to obtain heavy sizing; drying for 1-2h under the temperature of 80-120 DEG C; roasting the obtained product for 2-3h under the temperature of 300-500 DEG C to obtain a catalyst precursor; mixing the catalyst precursor and additives through proper amount of deionized water to obtain sizing; extruding the sizing into strips; drying for 3-4h under the temperature of 80-120 DEG C; and roasting for 2-3h under the temperature of 600-900 DEG C to obtain the finished product of catalyst. Accordingto the method, the preparation method of ferric oxide is improved; the spherical nanometer alpha-ferric oxide being 50-75nm in size is obtained; and meanwhile, the preparation technology of a ceriumsource is improved; the coprecipitation method is carried out to prepare Fe-K-Ce series ethylbenzene dehydrogenation catalyst, so that the catalyst is high in activity and stability.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to an ethylbenzene dehydrogenation catalyst, in particular to a preparation method of an ethylbenzene dehydrogenation catalyst using spherical nano-α-iron oxide as an iron source. Background technique [0002] At present, the production method of styrene is mainly the catalytic dehydrogenation of ethylbenzene. Metal oxides such as Fe-K-Ce are used as catalysts in the industrial production of ethylbenzene catalytic dehydrogenation. This catalyst mainly solves the problems of rapid catalyst deactivation and poor stability in the prior art. [0003] Hematite structure (α-Fe 2 o 3 ) is an n-type semiconductor, which is the most stable structure in thermodynamics, while nano-iron oxide has high porosity, excellent specific surface area, uniform dispersion, and can be 3+ Ions are stable. At the same time, the existence state of Ce element is as Ce 3+ The stable existence o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/887B01J35/08C07C5/333C07C15/46
CPCB01J23/8872B01J23/002B01J23/745C07C5/3332B01J2523/00C07C2523/887B01J35/394B01J35/51B01J2523/13B01J2523/3712B01J2523/375B01J2523/68B01J2523/842C07C15/46
Inventor 贾冬冬郝梦瑶王华伟王雷
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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