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High temperature resistant catalyst for low concentration methane combustion and preparation method thereof

A methane combustion and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as difficult and stable use, and achieve good thermal stability and Low temperature activity, simple preparation method and low pollution

Inactive Publication Date: 2012-04-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the strong exothermic reaction of methane combustion, the temperature of complete combustion of 1vol.% low-concentration methane is generally higher than 700°C, and the low calcination temperature of the catalyst determines that it is difficult to use stably at a temperature higher than 700°C

Method used

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  • High temperature resistant catalyst for low concentration methane combustion and preparation method thereof
  • High temperature resistant catalyst for low concentration methane combustion and preparation method thereof
  • High temperature resistant catalyst for low concentration methane combustion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] will contain 8.560g Y x Zr 1-x o 2-δ(x=0.09) powder precursor was added to 100ml of water, stirred with a homogenizer at 8000rpm for 10min to form a uniform and stable slurry, and then vigorously stirred with a stirring paddle for 0.5h. According to the general formula La 1-x Sr x mn 1-y Ni y o 3 (x=0.2, y=0.5) weigh 3.463g La(NO 3 ) 3 .6H 2 O, 0.423g Sr(NO 3 ) 2 , 1.789g 50%Mn(NO 3 ) 2 , 1.454g Ni(NO 3 ) 2 .6H 2 O was made into 100mL mixed aqueous solution; and 100mL NaOH aqueous solution containing 2.4g was added to the slurry at the same time, after vigorous stirring for 5h, filtered, the pH of the filtrate was 11.3. Rinse the filter cake until the filtrate is neutral; dry the filter cake at 120°C and roast at 900°C for 6 hours to obtain the catalyst, which is called Cat.1.

Embodiment 2

[0033] will contain 6.115g Y x Zr 1-x o 2-δ (x=0.08) powder precursor was added to 80ml of water, stirred with a homogenizer at 10000rpm for 5min, and then vigorously stirred with a stirring paddle for 0.5h. According to the general formula La 1-x Sr x mn 1-y Ni y o 3 (x=0.1, y=1) weigh 3.896g La(NO 3 ) 3 .6H 2 O, 0.212g Sr(NO 3 ) 2 , 2.907g Ni(NO 3 ) 2 .6H 2 O was made into 100mL mixed aqueous solution; and 100mL NaOH aqueous solution containing 2.4g was added to the slurry at the same time, after vigorous stirring for 5h, filtered, the pH of the filtrate was 11.9. Rinse the filter cake until the filtrate is neutral; dry the filter cake at 120°C and roast at 1100°C for 3 hours to obtain the catalyst, which is called Cat.2.

Embodiment 3

[0035] will contain 8.560g Y x Zr 1-x o 2-δ (x=0.09) powder precursor was added to 100ml of water, stirred with a homogenizer at 8000rpm for 10min, and then vigorously stirred with a stirring paddle for 0.5h. According to the general formula La 1-x Sr x mn 1-y Ni y o 3 (x=0.2, y=0.5) weigh 3.463g La(NO 3 ) 3 .6H 2 O, 0.423g Sr(NO 3 ) 2 , 1.789g 50%Mn(NO 3 ) 2 , 1.454g Ni(NO 3 ) 2 .6H 2 O was made into 100mL mixed aqueous solution; and 100mL NaOH aqueous solution containing 2.4g was added to the slurry at the same time, after vigorous stirring for 5h, filtered, the pH of the filtrate was 11.3. Rinse the filter cake until the filtrate is neutral; dry the filter cake at 120°C and roast at 1000°C for 4 hours to obtain the catalyst, which is called Cat.3.

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Abstract

The invention relates to a high temperature resistant catalyst for low concentration methane combustion and preparation method thereof. The catalyst is catalyst based on core shell structure of perovskite encapsulated yttrium stabilized zirconium nano particle. Mass percentage of perovskite is 10-30% and that of yttrium stabilized zirconium is 70-90%. The catalyst is used for methane catalytic combustion and able to completely catalytically combust methane at 380-545 degrees centigrade when methane content is 0.5% and space velocity is 24000h-1. The advantages of the invention are low catalyst cost, good thermal stability, simple preparation method, easy industrialization, small pollution, low methane ignition temperature and complete combustion temperature.

Description

technical field [0001] The invention relates to the field of methane combustion catalysts, in particular to a catalyst compounded with doped perovskite and yttrium-stabilized zirconium and a preparation method thereof. The catalyst is especially suitable for catalytic combustion of low-concentration methane. Background technique [0002] Methane is a green energy with abundant reserves, low pollution and high thermal efficiency. Among them, low-concentration methane occupies a large proportion, such as coal seam tunnel gas and landfill methane. Due to the high calorific value of methane, the adiabatic temperature rise produced by the complete combustion of 0.5% vol methane is 105.1K, and the annual calorific value of the gas exhausted from coal mines in my country is equivalent to 1.14-1.17×10 7 Ton of standard coal, the emission to the atmosphere not only wastes resources, but also aggravates the greenhouse effect (the greenhouse effect of methane is 21 to 24 times that o...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/72
Inventor 韩倩茜江志东
Owner SHANGHAI JIAO TONG UNIV
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