Unlock instant, AI-driven research and patent intelligence for your innovation.

A semi-coke low-temperature SCR denitrification catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of limited use of catalysts, narrow use temperature window, easy poisoning of catalysts, etc., to reduce secondary pollution, Wide applicable temperature window and the effect of reducing the use of NH3

Inactive Publication Date: 2021-02-02
CHONGQING UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of catalyst has a narrow operating temperature window (320-400°C), easy poisoning of the catalyst (alkali metal deactivates the catalyst), poor resistance to sulfur (the (NH 4 ) 2 SO 4 and NH 4 HSO 4 plugging the catalyst surface), NH 3 escape (secondary pollution) and other issues, which greatly limit the use of this type of catalyst in the process of low-temperature flue gas denitrification

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing a semi-coke low-temperature SCR denitration catalyst, characterized in that it comprises the following steps:

[0047] 1) After crushing and screening the raw material semi-coke, take 20 g of semi-coke particles with a particle size ranging from 20 to 40 mesh, wash them with deionized water, and then dry them;

[0048] The temperature of the drying process is 100°C, and the drying time is 6h;

[0049] 2) placing the dried semi-coke particles obtained in step 1) in a nitric acid solution for oxidation treatment;

[0050] The temperature in the oxidation treatment process is 80°C, and the oxidation treatment time is 3h;

[0051]The concentration of the nitric acid solution is 60wt.%;

[0052] The volume-to-weight ratio (mL:g) of the nitric acid solution and the semi-coke particles is 5:1;

[0053] 3) filtering the oxidized semi-coke particles obtained in step 2), washing with deionized water until neutral, and drying to obtain active semi-coke pa...

Embodiment 2

[0072] A method for preparing a semi-coke low-temperature SCR denitration catalyst, characterized in that it comprises the following steps:

[0073] 1) After crushing and screening the raw semi-coke, take 20 g of semi-coke particles with a particle size ranging from 16 to 20 mesh, wash with deionized water, and then dry them;

[0074] The temperature of the drying process is 110° C., and the drying time is 4 hours;

[0075] 2) placing the dried semi-coke particles obtained in step 1) in a nitric acid solution for oxidation treatment;

[0076] The temperature in the oxidation treatment process is 70°C, and the oxidation treatment time is 4h;

[0077] The concentration of the nitric acid solution is 57wt.%;

[0078] The volume-to-weight ratio (mL:g) of the nitric acid solution to the semi-coke particles is 4:1;

[0079] 3) filtering the oxidized semi-coke particles obtained in step 2), washing with deionized water until neutral, and drying to obtain active semi-coke particles...

Embodiment 3

[0098] A method for preparing a semi-coke low-temperature SCR denitration catalyst, characterized in that it comprises the following steps:

[0099] 1) After crushing and screening the raw material semi-coke, take 20 g of semi-coke particles with a particle size ranging from 20 to 40 mesh, wash them with deionized water, and then dry them;

[0100] The temperature of the drying process is 90°C, and the drying time is 6h;

[0101] 2) placing the dried semi-coke particles obtained in step 1) in a nitric acid solution for oxidation treatment;

[0102] The temperature in the oxidation treatment process is 80°C, and the oxidation treatment time is 3h;

[0103] The concentration of the nitric acid solution is 63wt.%;

[0104] The volume-to-weight ratio (mL:g) of the nitric acid solution to the semi-coke particles is 6:1;

[0105] 3) filtering the oxidized semi-coke particles obtained in step 2), washing with deionized water until neutral, and drying to obtain active semi-coke par...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle size (mesh)aaaaaaaaaa
particle size (mesh)aaaaaaaaaa
particle size (mesh)aaaaaaaaaa
Login to View More

Abstract

The invention discloses a semi-coke low-temperature SCR denitrification catalyst and a preparation method thereof, which is characterized in that: the catalyst is prepared by using semi-coke as a carrier, metal manganese oxide as an active component, and melamine as a supplementary reducing agent; After the semi-coke carrier is activated by nitric acid, the active component and the supplementary reducing agent are loaded by dipping and calcining; the loading of the active component of the catalyst is 5% to 15% of the weight of the carrier; the loading of the supplementary reducing agent of the catalyst is the carrier 5-20% of the weight. The carrier semi-coke used in the present invention has low cost, high strength, good thermal stability, and simple preparation process; under the working temperature of 175-300°C, it can achieve a denitrification efficiency of more than 90%; at the same time, it can reduce NH 3 The use of the invention reduces secondary pollution, is environmentally friendly, has remarkable effects, and is suitable for industrial promotion and application.

Description

technical field [0001] The invention relates to the field of atmospheric nitrogen oxide pollution control, in particular to a semi-coke low-temperature SCR denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants. According to the different combinations of nitrogen and oxygen, nitrogen oxides have a variety of compounds in different forms. Among them, NO and NO 2 , while more than 95% of the NO x is NO, NO in the flue x More than 90% are also NO. [0003] With economic development and social progress, due to NO x The rapid growth of emissions has led to the transformation of my country's acid rain pollution from sulfuric acid type to sulfuric acid / nitric acid compound type, and the increasingly serious compound acid rain pollution has offset my country's SO 2 The great efforts made in emission reduction are also one of the important reasons for the frequent occurrence of smog in ci...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/32B01D53/86B01D53/90B01D53/56
CPCB01D53/865B01D53/90B01D2258/0283B01J31/32
Inventor 姚璐刘清才蒋历俊任山阳杰杨剑胡广孔明范超孟飞
Owner CHONGQING UNIV