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Catalyst for selectively catalytically reducing nitrogen-oxygen compound by using propane under oxygen-enriched condition

A technology of nitrogen oxides and selectivity, applied in chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve problems such as narrow operating window, achieve wide operating window, high purification performance of nitrogen oxides, and good repeatability Effect

Inactive Publication Date: 2015-09-30
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when low alkanes or alkenes are used as reducing agents, the operating window is narrow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 0.235g of silver nitrate and dissolve it in deionized water, then add 3g of 5% TiO 2 Al 2 o 3 , impregnated at 20°C for 6 hours, then dried in an oven at 110°C for 24 hours, and then baked in a muffle furnace at 600°C for 5 hours to prepare 5% Ag / TiO 2 -Al 2 o 3 catalyst.

[0018] Activity test: fixed bed reactor, reaction gas composition: NO = 450ppm, C 3 h 8 = 900ppm, O 2 = 7%, Ar as the balance gas. Total reaction gas flow 320 cm 3 / min. The activity of HC-SCR on the catalyst was tested in the temperature range of 200 ~ 600 ℃. Use the Model 42i-HS NOx concentration analyzer (Thermo-Scientific) to detect the conversion rate of NOx and the FULI 9790 chromatography (Zhejiang Fuli Analytical Instrument Co., Ltd.) to detect C 3 h 8 conversion rate.

Embodiment 2

[0020] In Example 1, additives were added, and silver nitrate and samarium nitrate were simultaneously dissolved in deionized water (the weight content of Sm was 0.5%), and the rest of the steps were the same to obtain 5%Ag / 0.5%Sm 2 o 3 / TiO 2 -Al 2 o 3 catalyst.

Embodiment 3

[0022] In Example 1, additives were added, silver nitrate and samarium nitrate were dissolved in deionized water at the same time (Sm weight content was 1%), and the rest of the steps were the same to obtain 5%Ag / 1%Sm 2 o 3 / TiO 2 -Al 2 o 3 catalyst.

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PUM

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Abstract

The invention relates to a catalyst for selectively catalytically reducing a nitrogen-oxygen compound by using propane under an oxygen-enriched condition. The catalyst is prepared from an active component which is silver oxide, and a carrier is TiO2 modified aluminum oxide; an auxiliary is Sm2O3; the catalyst is prepared by adopting an immersion method. The catalyst is high in catalytic activity and selectivity in C3H8-CSR reaction, can be used for catalytic purification of diesel vehicle tail gas and belongs to the field of environment pollution control.

Description

technical field [0001] The invention relates to the fields of environmental pollution control technology, mobile source tail gas purification and the like. In particular, it relates to a supported silver catalyst for selectively catalytically reducing nitrogen oxides under oxygen-enriched conditions and a preparation method thereof. Background technique [0002] With the continuous rapid growth of my country's economy and the significant increase in the production and ownership of motor vehicles, the emission of NO x It has become one of the primary sources of air pollutants in large and medium-sized cities. NO x As one of the main air pollutants, including NO, NO 2 , N 2 O, N 2 o 3 and N 2 o 4 . NO x It will lead to the formation of greenhouse effect, ozone depletion, acid rain and photochemical smog, which poses a serious threat to the environment and human health. Therefore, NO x Emission control has become a research hotspot in the field of atmospheric enviro...

Claims

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Application Information

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IPC IPC(8): B01J23/66B01D53/90B01D53/56
Inventor 郭耘曹建美王丽卢冠忠詹望成王艳芹郭杨龙王筠松
Owner EAST CHINA UNIV OF SCI & TECH
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