Solid acid catalyst for selective catalystic reduction of NOx by methane and preparation method thereof

A solid acid catalyst and catalyst technology, which is used in industrial catalysis, environmental pollution control technology, automobile industry, and gas purification fields. It can solve problems such as high ozone concentration, greenhouse effect, and corrosion, and achieve high catalytic combustion activity and low cost. Effect

Inactive Publication Date: 2012-05-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NOx will also cause the ozone concentration on the ground to be too high, resulting in the greenhouse effect, etc.
[0003] Take NH 3 The SCR technology as a reducing agent has been industrially applied to a certain extent, but there is NH 3 Leakage and corrosion problems, researchers are constantly looking for other alternative technologies

Method used

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  • Solid acid catalyst for selective catalystic reduction of NOx by methane and preparation method thereof
  • Solid acid catalyst for selective catalystic reduction of NOx by methane and preparation method thereof
  • Solid acid catalyst for selective catalystic reduction of NOx by methane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 6 parts of 20-60 mesh γ-Al 2 o 3 Carrier, each 5g, one of which is left untreated, marked as A. The rest were impregnated in H 2 SO 4Concentrations of 0.2, 0.7, 1.5, 2.5, 3.5M / L solution, the volume of each sulfuric acid solution is 6ml, and then soaked at room temperature for 30min, stirring once every ten minutes during the soaking process, put it into 110 Dry in an oven at ℃ for 12 hours, take it out, put it into a muffle furnace and bake at 600℃ for 4 hours, the heating rate of the furnace is 5℃ / min, and the carrier A, 0.2SA, 0.7SA, 1.5SA, 2.5SA, 3.5SA are obtained.

Embodiment 2

[0031] Take 0.5ml of a solution with a Pd content of 12mg / ml, dilute it to 7.5ml with water, immerse 3g of carrier A in it for 30min, then evaporate to dryness with a rotary evaporator, the condition is 55°C for 1h, take it out, and put it in the muffle Calcined in the furnace at 600°C for 4h, and the heating rate of the furnace was 5°C / min, to prepare the catalyst Pd / A.

Embodiment 3

[0033] Take 0.5ml of solution with Pd content of 12mg / ml, dilute it to 7.5ml with water, immerse 3g carrier 0.2SA in it, immerse in it for 30min, then evaporate to dryness with rotary evaporator, the condition is 55℃ for 1h, take it out, and put it in the horse The catalyst Pd / 0.2SA was prepared by calcining at 600°C for 4h in a Furnace with a heating rate of 5°C / min.

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Abstract

The invention relates to a solid acid catalyst for selective catalystic reduction of NOx by methane and a preparation method thereof, mainly applying for purifying motor vehicle tail gas and factory flue tail gas, belonging to the field of environmental pollution control. The solid acid catalyst Pd / SO4<2->-Al2O3 comprises 0.2 wt% of noble metal Pb, 2.4-30 wt% of SO4<2->, and 69.8-97.4 wt% of gamma-Al2O3. The preparation method comprises the following steps: loading PdCl2 as a precursor on a carrier, and processing a gamma-Al2O3 carrier by using H2SO4, wherein, the concentration of H2SO4 is 0.2-2.5 M / L. According to the invention, by using an impregnation method to load the noble metal on the acid-treated Al2O3 carrier, the prepared catalyst has the advantages of few consumption of noble metal, low cost, simple preparation technology, and high activity for transformation of NOx and CH4.

Description

technical field [0001] The invention relates to the fields of industrial catalysis, environmental pollution control technology, gas purification, automobile industry and the like. Introducing a Pd / SO4 catalyst for the selective catalytic reduction of NOx from methane under oxygen-enriched conditions 4 2- -Al 2 o 3 Solid acid catalyst and its preparation method. technical background [0002] Nitrogen oxides (NOx) contain N 2 O, NO, NO 2 , N 2 o 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 etc. Among them, the main pollutants to the atmosphere are NO and NO 2 , more than 95% of NOx in the atmosphere is NO, NO 2 Only a small amount, more than 90% of the NOx in the flue gas is also NO. NO in the atmosphere. The main sources are: combustion of fossil fuels, supersonic aircraft, biomass combustion, lightning processes, photochemical processes in the stratosphere, NH 3 Oxidation in the atmosphere, NO in soil and ocean 2 Photolysis. Among them, the combustion of fossil fuel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01D53/86B01D53/56B01D53/72
Inventor 张志刚刘洋卢冠忠郭耘詹望成郭杨龙王筠松
Owner EAST CHINA UNIV OF SCI & TECH
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