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Iron-base composite oxide catalyst for producing styrene by CO2 oxidative dehydrogenation of ethylbenzene

A technology for the production of ethylbenzene dehydrogenation and composite oxides, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, carbon compound catalysts, physical/chemical process catalysts, etc. Solve the problems of low dispersity of active components and low conversion rate of ethylbenzene, and achieve the effects of short cycle time, simple preparation method and high dispersity

Active Publication Date: 2016-10-12
SHAANXI NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the dispersion of the loaded active components is low, so that the conversion rate of ethylbenzene is only about 60%.
(3) Prepared by impregnation method, which is easy to operate, but takes a long time, and the dispersion of catalyst active components is average, so the conversion rate of ethylbenzene is low, generally not more than 60%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Add 130mg of γ-Al with a particle size of 20-30μm 2 o 3 Put it into the reaction chamber of the atomic layer deposition system, seal the reaction chamber, evacuate the atomic layer deposition system and feed nitrogen gas, adjust the outlet valve of the reaction chamber so that the pressure in the chamber is 100Pa, heat the reaction chamber to maintain the temperature of the reaction chamber at 350 ℃.

[0020] 2. Heat the ferrocene to 90°C, inject the generated ferrocene vapor into the reaction chamber of the atomic layer deposition system and γ-Al 2 o 3 A gas-solid interface reaction occurs, the reaction time is 1800s, and then nitrogen is injected into the reaction chamber to flush excess ferrocene and by-products, the time is 1800s; oxygen is injected into the reaction chamber, the reaction time is 1800s, and then nitrogen is flushed Excess oxygen and by-products for 1800s.

[0021] 3. Repeat step 2 twice to get FeO x / Al 2 o 3 Powder.

[0022] 4. After vac...

Embodiment 2

[0024] In step 4 of Example 1, after vacuuming the atomic layer deposition system, nitrogen gas is introduced, the outlet valve of the reaction chamber is adjusted so that the pressure in the chamber is 130 Pa, the temperature of the reaction chamber is maintained at 200 ° C, and palladium hexafluoroacetylacetonate is heated At 60 ° C, the generated palladium hexafluoroacetylacetonate vapor is brought into the reaction chamber of the atomic layer deposition system by nitrogen gas, and FeO x / Al 2 o 3The powder reacts, the reaction time is 150s, and then nitrogen gas is introduced into the reaction chamber to flush the excess palladium hexafluoroacetylacetonate and by-products, the time is 100s; water vapor carried by nitrogen gas is introduced into the reaction chamber, and the reaction time is 150s , and then feed nitrogen into the reaction chamber for flushing, the time is 100s, and the other steps are the same as in Example 1 to obtain the iron-based composite oxide cataly...

Embodiment 3

[0026] In step 4 of Example 1, the atomic layer deposition system was evacuated and then nitrogen gas was introduced, the outlet valve of the reaction chamber was adjusted so that the pressure in the chamber was 80 Pa, and the temperature of the reaction chamber was maintained at 150 ° C. Tetraisopropyl titanate Heating to 60 ° C, the generated tetraisopropyl titanate vapor is brought into the reaction chamber of the atomic layer deposition system by nitrogen, and FeO x / Al 2 o 3 The powder reacts, the reaction time is 100s, and then nitrogen gas is passed into the reaction chamber to flush the excess tetraisopropyl titanate and by-products, the time is 100s; hydrogen peroxide carried by nitrogen gas is passed into the reaction chamber, the reaction time is 100s , and then feed nitrogen into the reaction chamber for flushing, the time is 100s, and the other steps are the same as in Example 1 to obtain the iron-based composite oxide catalyst TiO 2 -FeO x / Al 2 o 3 . The p...

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Abstract

The invention discloses an iron-base composite oxide catalyst for producing styrene by CO2 oxidative dehydrogenation of ethylbenzene. Specifically, Gamma-Al2O3 is a carrier of the catalyst, FeOx is an active component thereof, and one of TiO2, PdO, ZnO and V2O5 is an additive of the catalyst; the catalyst is prepared by an atomic layer deposition method. Since the catalyst is used for producing styrene by CO2 oxidative dehydrogenation of ethylbenzene, selectivity of styrene reaches 95% above, and conversion rate of ethylbenzene reaches 65% above and even is up to 85% around. Besides, in preparation of the catalyst, liquid phase procedures such as dissolution and deposition of precursors are omitted, and the precursors disperse in surfaces and holes of the carrier directly; thus, the active component of the catalyst has high dispersity. In addition, the preparation method of the catalyst is simple with requirements for short cycle and mild condition.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a 2 Preparation of catalyst for dehydrogenation of ethylbenzene to styrene and evaluation of its reactivity. 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 problems such as 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 that can break the limitation of thermodynamic equilibrium, solve the problem of self-heating and reduce the reaction temperature. However, air or oxygen oxidation of ethylbenzene to styrene is accompanied by side rea...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J23/89B01J23/745B01J23/847C07C5/42C07C15/46
CPCC07C5/42B01J23/002B01J23/745B01J23/80B01J23/8472B01J23/8906C07C2523/847C07C2523/745C07C2523/80C07C2523/89B01J2523/00B01J35/633B01J35/647B01J35/615B01J2523/27B01J2523/31B01J2523/842B01J2523/824B01J2523/47B01J2523/55C07C15/46
Inventor 刘忠文宋珂琛冯昊郭策刘昭铁宋永红
Owner SHAANXI NORMAL UNIV
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