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Catalyst for desorbing nitrogen oxides and carbon monoxide at low temperature and preparation method thereof

A nitrogen oxide and carbon monoxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Short service life and other problems, to achieve the effect of simplifying industrial emission reduction process, simple composition, improving activity and service life

Inactive Publication Date: 2013-11-27
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that although there have been many research reports on low-temperature SCR catalysts at home and abroad, these catalysts still have defects such as low low-temperature activity, short service life, single function, or complicated preparation process and high cost.

Method used

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  • Catalyst for desorbing nitrogen oxides and carbon monoxide at low temperature and preparation method thereof
  • Catalyst for desorbing nitrogen oxides and carbon monoxide at low temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Catalyst preparation:

[0031] a) Coconut shell activated carbon was pickled with hydrochloric acid, washed with water, and dried at 110°C for 5h, and then the equal volume water absorption of activated carbon was measured;

[0032] b) At 22°C, weigh 10 g of activated carbon treated in step a), and prepare Cu (NO 3 ) 2 solution; put activated carbon into Cu(NO 3 ) 2 Immerse in the solution for 24h;

[0033] c) drying the activated carbon after step b) at 110° C. for 5 hours;

[0034] d) Calcining the dried coconut shell activated carbon in step c) at 300° C. for 3 hours to obtain a finished catalyst.

[0035] Catalyst activity detection: Simulated flue gas composition (volume fraction): NO / N 2 (5%, 20ml / min), NH 3 (5%, 8ml / min), O 2 (10ml / min) and balance gas N 2 (100ml / min), the gas flow is controlled by a rotameter, and the gas is mixed and passed into the reaction tube.

[0036] NO x The formula for calculating the removal efficiency is as follows:

...

Embodiment 2

[0044] Catalyst preparation:

[0045] a) Coconut shell activated carbon was pickled with hydrochloric acid, washed with water, and dried at 100°C for 6h, and then the equal volume water absorption of activated carbon was measured;

[0046] b) At 25°C, weigh 10 g of activated carbon treated in step a), and prepare Cu (NO 3 ) 2 solution; put activated carbon into Cu(NO 3 ) 2 Immerse in the solution for 12h;

[0047] c) drying the activated carbon treated in step b) at 80° C. for 7 hours;

[0048] d) Calcining the dried coconut shell activated carbon in step c) at 200°C for 5 hours to obtain a finished catalyst.

[0049] The content of each component of the catalyst prepared by the above method and the dispersion of CuO are as follows: figure 1 and figure 2 as shown, figure 1 Show that in the catalyst composition that this preparation method obtains: Cu element content is 5.04%, C element content is 86.69%, O element content is 8.27%, figure 2 It shows that CuO is unif...

Embodiment 3

[0054] Catalyst preparation:

[0055] a) Coconut shell activated carbon was pickled with hydrochloric acid, washed with water, and dried at 120°C for 6h, and then the equivalent volume water absorption of activated carbon was measured;

[0056] b) 35°C, weigh 10g of activated carbon treated in step a), and prepare Cu(NO 3 ) 2 solution; put activated carbon into Cu(NO 3 ) 2 Immerse in the solution for 72h;

[0057] c) drying the activated carbon treated in step b) at 110° C. for 8 hours;

[0058] d) Calcining the dried coconut shell activated carbon in step c) at 500° C. for 3 hours to obtain a finished catalyst.

[0059] Catalyst activity detection: Composition of flue gas and NO x The formula for calculating the removal rate of CO and CO is the same as in Example 1. Pack this catalyst in a quartz reaction tube, pass through simulated flue gas containing NO, and detect the NO concentration in the inlet and outlet gases at a reaction temperature of 275°C. x The remo...

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Abstract

The invention relates to a catalyst for desorbing nitrogen oxides and carbon monoxide at a low temperature and a preparation method thereof. The catalyst is composed of an active component and an activated carbon carrier, wherein the active component adopts cupric oxide and / or cuprous oxide, according to cupric oxide, the content of the active component accounts for 1 to 30 percent of the total weight of the catalyst, the catalyst can be used for desorbing nitrogen oxides and carbon monoxide in flue gas independently or simultaneously at a low temperature, and the rate of desorbing nitrogen oxides independently at the temperature of 225 DEG C can reach 97 percent; the rate of desorbing carbon monoxide independently at the temperature of 275 DEG C can reach 93 percent; the rates of desorbing nitrogen oxides and carbon monoxide at the same time at the temperature of 250 DEG C can reach 94 percent and 83 percent respectively. The composition of the catalyst is simple, the cost is low, an industrial emission reduction process is simplified and purifying equipment can be reduced. The invention further comprises the preparation method of the catalyst for desorbing nitrogen oxides and carbon monoxide at the lower temperature, the preparation method of the catalyst is simple, the used raw material is low in cost, the production cost is low, and zero contamination to the environment can be ensured.

Description

technical field [0001] The invention relates to a catalyst for removing nitrogen oxides and carbon monoxide in flue gas, in particular to a catalyst for removing nitrogen oxides and carbon monoxide at low temperature and a preparation method thereof. Background technique [0002] Nitrogen oxide NO x CO and carbon monoxide are the main substances of air pollution, mainly from the discharge of large boilers in coal-fired power plants and the large number of industrial boilers, cement glass kilns, metallurgical steel sintering furnaces, chemical plants, pickling equipment and automobile exhaust that are widely distributed in my country. etc. emissions. The pollution of nitrogen oxides and carbon monoxide has become an important issue in environmental governance, and adsorption removal and catalytic conversion of nitrogen oxides and carbon monoxide are important means of governance. [0003] At present, the most mature and effective flue gas denitrification technology of coal-f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01D53/86B01D53/56B01D53/62
CPCY02A50/20
Inventor 徐琼尹笃林颜松林曹权胡志辉杨记刘敏谭蓉毛丽秋喻宁亚伏再辉兰支利
Owner HUNAN NORMAL UNIVERSITY
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