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High-specific-surface-area perovskite catalyst LaCo0.9Mg0.1O3 and preparation method thereof

A high specific surface area, perovskite technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as gaps, and achieve easy operation, process Simple, Inexpensive Effects

Inactive Publication Date: 2013-10-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The results show that the partial substitution of Ag can improve the LaMnO 3 Catalytic activity for methane, the methane conversion rate reaches 98.9% at 750°C, and its activity still has a certain gap compared with similar catalysts

Method used

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  • High-specific-surface-area perovskite catalyst LaCo0.9Mg0.1O3 and preparation method thereof
  • High-specific-surface-area perovskite catalyst LaCo0.9Mg0.1O3 and preparation method thereof
  • High-specific-surface-area perovskite catalyst LaCo0.9Mg0.1O3 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: take by weighing 2.165g La(NO 3 ) 3 ·6H 2 O, 1.31g Co(NO 3 ) 3 ·6H 2 O and 0.128g Mg(NO 3 ) 2 ·6H 2 O was dissolved in 30 mL of deionized water, 0.2 glycine was added thereto, and after magnetic stirring for 1 h, a homogeneous solution was formed. Place the above solution in a water bath at 80°C, stir and evaporate to dryness until it reaches a sol state; place it in an oven at 105°C to dry to obtain a precursor, and firstly bake the precursor in a muffle furnace at a heating rate of 3°C / min to a temperature of 400°C 4h, and then the roasted precursor was raised to a temperature of 700°C in a muffle furnace at a heating rate of 3°C / min and roasted for 4h to obtain a perovskite powder; the obtained perovskite powder was added to a concentration of 0.4mol / In 1 L of acetic acid solution, magnetically stirred for 1 h to remove excess magnesia solids, washed the obtained sample with deionized water, centrifuged, and dried in an oven at 80°C for 12 h to...

Embodiment 2

[0029] Embodiment 2: take by weighing 2.165g La(NO 3 ) 3 ·6H 2 O, 1.31g Co(NO 3 ) 3 ·6H 2 O and 1.28g Mg(NO 3 ) 2 ·6H 2 O was dissolved in 30 mL of deionized water, 2 g of glycine was added thereto, and after magnetic stirring for 1 h, a homogeneous solution was formed. Place the above solution in a water bath at 80°C, stir and evaporate to dryness until it reaches a sol state; place it in an oven at 105°C to dry to obtain a precursor, and firstly bake the precursor in a muffle furnace at a heating rate of 3°C / min to a temperature of 400°C 4h, and then the roasted precursor was raised to a temperature of 700°C in a muffle furnace at a heating rate of 3°C / min and roasted for 4h to obtain a perovskite powder; the obtained perovskite powder was added to a concentration of 0.4mol / In 1 L of acetic acid solution, magnetically stirred for 1 h to remove excess magnesia solids, washed the obtained sample with deionized water, centrifuged, and dried in an oven at 80°C for 12 h ...

Embodiment 3

[0032] Embodiment 3: take by weighing 2.165g La(NO 3 )e 3 ·6H 2 O, 1.31g Co(NO 3 ) 3 ·6H 2 O and 2.56g Mg(NO 3 ) 2 ·6H 2 O was dissolved in 30 mL of deionized water, 1.46 g of glycine was added thereto, and after magnetic stirring for 1 h, a homogeneous solution was formed. Place the above solution in a water bath at 80°C, stir and evaporate to dryness until it reaches a sol state; place it in an oven at 105°C to dry to obtain a precursor, and firstly bake the precursor in a muffle furnace at a heating rate of 3°C / min to a temperature of 400°C 4h, and then the roasted precursor was raised to a temperature of 700°C in a muffle furnace at a heating rate of 3°C / min and roasted for 4h to obtain a perovskite powder; the obtained perovskite powder was added to a concentration of 0.4mol / In 1 L of acetic acid solution, magnetically stirred for 1 h to remove excess magnesia solids, washed the obtained sample with deionized water, centrifuged, and dried in an oven at 80°C for 1...

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Abstract

The invention provides a perovskite catalyst for catalyzing oxidized combustion of methane and a preparation method thereof. The structural formula of the perovskite catalyst for the oxidized combustion of the methane is LaCo0.9Mg0.1O3. The preparation method comprises the following steps of: preparing a solution with a raw material ratio of magnesium to lanthanum of 0.1 to 3 by taking lanthanum, cobalt and magnesium as raw materials, stirring the raw materials at the temperature of 80 DEG C until the solution is evaporated to gel, pre-sintering a precursor at the temperature of 400 DEG C, finally sintering the precursor at the temperature of 700 DEG C to obtain a preproduct, stirring the preproduct in acetum with the concentration of 0.4 mol / L for 1 hour, removing residual MgO from the product, centrifugating and washing the product by deionized water, and drying the product to obtain the catalyst LaCo0.9Mg0.1O3 with high specific surface area. The perovskite catalyst has the advantages of simple operation and low cost; the synthesized catalyst is higher in specific surface area and has extremely high activity on the catalytic combustion of the methane.

Description

Technical field: [0001] The invention relates to a preparation method of a perovskite catalyst with a higher specific surface area, in particular to a method for synthesizing LaCo with a higher specific surface area by a glycine nitrate method. 0.9 Mg 0.1 o 3 The catalyst method is applied to the catalytic combustion of methane and belongs to the field of catalytic technology and environmental protection. Background technique [0002] With the rapid development of the global economy and the rapid growth of population, energy shortage and environmental pollution have gradually become serious problems faced by human beings. At present, the reserves of fossil fuels represented by coal and oil are limited and non-renewable, and human beings focus on finding alternative energy sources. Natural gas (mainly composed of CH 4 ) is considered to be one of the main energy sources in the 21st century with the advantages of abundant reserves, low price, high thermal efficiency, low p...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/10
Inventor 郭广生王立娟顾福博王志华韩冬梅
Owner BEIJING UNIV OF CHEM TECH
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