Preparation method for core-shell perovskite-type catalyst for preparing methanol through methane

A perovskite-type, methanol-making technology, which is applied in oxidation reaction preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low catalyst activity, achieve simple regeneration operation, simple operation, and improved activity Effect

Inactive Publication Date: 2014-08-06
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a core-shell perovskite catalyst for methane to methanol, which is used to improve the problem of low catalyst activity in the traditional methane to methanol process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 0.8993g nanometer Fe 2 o 3 , disperse with 45mL ethanol under the action of ultrasonic wave for 20min, let it settle for 8h, remove the supernatant, add 45mL deionized water, and apply ultrasonic wave for 15min to obtain nano-scale Fe 2 o 3 suspension; take 0.5227g Ba(NO 3 ) 2 , 0.3035g TiCl 4 , 0.0731g Ni(NO 3 ) 2 Add 30 mL of deionized water and stir for 30 min to fully dissolve it. Then add 1.5371g citric acid, heat and stir at 45°C for 35min to fully complex, then add Fe 2 o 3 Suspension, stirred at 45°C for 35min to mix well. Add 0.4965g of ethylene glycol and stir at 80°C to evaporate the solution until a colloidal mixture is obtained. After drying at 120°C for 12 hours, bake at 800°C for 8 hours to obtain 50% Fe 2 o 3 50%BaTi 0.8 Ni 0.2 o 3 Core-shell perovskite catalysts.

[0024] The 50%Fe prepared by the present embodiment 2 o 3 50%BaTi 0.8 Ni 0.2 o 3 The core-shell perovskite catalyst was added to a differential fixed-bed reactor for ...

Embodiment 2

[0026] Take 0.8635g nanometer Fe 2 o 3, disperse with 40mL ethanol under the action of ultrasonic wave for 20min, let it settle for 8h, remove the supernatant, add 40mL deionized water, and apply ultrasonic wave for 15min to obtain nano-scale Fe 2 o 3 suspension; take 0.4233g Sr(NO 3 ) 2 , 0.2656g TiCl 4 , 0.1746g Co(NO 3 ) 2 Add 40 mL of deionized water and stir at 35°C for 30 min to dissolve completely. Then add 2.9225g EDTA, heat and stir at 50°C for 30min to fully complex, then add Fe 2 o 3 Suspension, stirred at 50°C for 30min to mix well. Add 0.6207g of ethylene glycol and stir at 80°C to evaporate the solution until a colloidal mixture is obtained. After drying at 105°C for 12 hours, bake at 1000°C for 12 hours to obtain 50% Fe 2 o 3 50%SrTi 0.7 co 0.3 o 3 Core-shell perovskite catalysts.

[0027] The 50%Fe prepared by the present embodiment 2 o 3 50%SrTi 0.7 co 0.3 o 3 The core-shell perovskite catalyst was added to a differential fixed-bed reactor ...

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Abstract

The invention relates to a preparation method for a core-shell perovskite-type catalyst for preparing methanol through methane. The general formula of the core-shell perovskite-type catalyst is Fe2O3@A(1-m)A'mB(1-n)B'nO3. The preparation method for the core-shell perovskite-type catalyst comprises the following steps: adding nano-sized or micron-sized Fe2O3 into ethanol; dispersing under the effect of ultrasonic waves; removing the supernatant after complete precipitation; using ultrasonic waves to disperse Fe2O3 into deionized water to obtain a Fe2O3 suspension; adding soluble salts corresponding to A, A', B and B' to deionized water; stirring to allow the soluble salts to dissolve completely; adding a complexing agent; after heating and stirring for complexing, adding to the Fe2O3 suspension; stirring evenly; adding glycol; after thorough stirring, evaporating to obtain a colloidal mixture; drying and roasting to obtain the core-shell perovskite-type catalyst. The core-shell perovskite-type catalyst is a perovskite-type oxide catalyst of a core-shell structure; the active constituent, namely Fe2O3 is wrapped in the perovskite oxide, so that the phenomenon that the Fe2O3 is reduced to elementary substance Fe in the catalytic oxidation process, and the activity of the core-shell perovskite-type catalyst declines due to the sintering and accumulation of the Fe, is effectively prevented.

Description

1. Technical field: [0001] The invention relates to a perovskite composite oxide catalyst in the field of industrial catalysis application, in particular to a method for preparing a core-shell perovskite catalyst used for methane to methanol. 2. Background technology: [0002] In recent years, with the rapid development of my country's economy, the production and consumption of the three major resources of oil, coal and natural gas have also developed rapidly. Among the consumption of the three major resources, the contradiction between oil reserves, exploitation and consumption is very prominent, and the relationship between supply and demand is becoming increasingly tense. my country is rich in natural gas resources, but its utilization level is low. Only a small part is used to prepare synthesis gas for ammonia synthesis, and most of them are used as fuel gas for civilian use. The energy utilization efficiency is low, resulting in a great waste of resources. How to Convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C07C31/04C07C29/50
CPCY02P20/52
Inventor 陈彦广徐婷婷韩洪晶宋华张梅韩洪伟
Owner NORTHEAST GASOLINEEUM UNIV
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