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Process for preparing nitric oxide adsorbent with high adsorption capacity

A nitrogen oxide, high adsorption technology, applied in the direction of chemical instruments and methods, other chemical processes, etc., can solve the problem of low adsorption capacity

Active Publication Date: 2010-04-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcoming that the adsorption capacity of the existing rare-earth NOx trap catalyst is too low, thereby preparing a kind of adsorbent that can effectively adsorb NOx in the low-temperature exhaust gas, providing for removing the NOx in the low-temperature exhaust gas such as sintering flue gas a new method

Method used

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preparation example Construction

[0010] The preparation method of a nitrogen oxide adsorbent with high adsorption capacity provided by the invention is characterized in that the method comprises the following steps:

[0011] 1) Pretreatment of activated carbon carrier: Disperse activated carbon in 0.1M-10M nitric acid solution, the mass ratio of liquid to solid is 1:1-1:100, heat to 40-90°C under stirring and reflux, and oxidize for 5-20 hours Filter washed and air dried to constant weight;

[0012] 2) metal element loading: soluble cerium salt and soluble transition metal salt are dissolved in a solvent, and the solvent can be any one or a mixture of any of water, acetone, ethanol, wherein the molar ratio of cerium and transition metal is between Between 9:1~5:5, the activated carbon prepared in step 1) is dropped into the solution containing soluble cerium salt and soluble transition metal salt, heated under stirring, and the solvent is gradually volatilized to dryness at the boiling point of the solvent it...

Embodiment 1

[0016] Add 2000g of activated carbon to 200kg of 0.1M nitric acid, oxidize at 90°C for 20hrs under stirring and reflux, filter out the activated carbon, wash fully and dry in air to constant weight; mix 0.1mol cobalt(II) nitrate and 0.9mol Dissolve cerium (III) nitrate in 500mL ethanol, add the above-mentioned activated carbon, heat to 90°C under stirring to make it volatilize to dryness, and then burn it in a muffle furnace at 300°C under a nitrogen atmosphere for 6 hours to obtain a catalyst that can catalyze at low temperature An adsorbent material that oxidizes and absorbs nitrogen oxides.

Embodiment 2

[0018] Add 333.33g of activated carbon into 333.33g of 10M nitric acid, oxidize at 40°C for 5hr under stirring and reflux, filter out the activated carbon, wash fully and dry in air to constant weight; mix 0.4mol manganese (II) nitrate and 0.6 mol of cerium(III) nitrate was dissolved in 200mL of acetone, and the above-mentioned activated carbon was added, heated to 70°C under stirring to make it evaporate to dryness, and then burned in a muffle furnace at 600°C under a nitrogen atmosphere for 2 hours to obtain An adsorption material that catalyzes oxidation and absorbs nitrogen oxides.

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Abstract

A process for preparing nitric oxide adsorbent with high adsorption capacity belongs to the technical field of material preparation and waste gas treatment and comprises steps of utilizing manganese element ( or cobalt element ) and cerium element as main catalytic oxidation components, utilizing activated carbon as an NOx adsorbing component, obtaining activated carbon materials carrying the manganese element (or cobalt element) and the cerium element, and then obtaining an adsorbent material which can effectively oxidize NO into NO2 and adsorb NO2 at a low temperature by firing of inert gas. NOx adsorption capacity (by NO2) of the adsorbent material can reach over 30mg / g, therefore, the process for preparing nitric oxide adsorbent with high adsorption capacity has fine application prospect in operation of sintering smoke and gas denitration.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen oxide adsorbent with high adsorption capacity, and belongs to the technical field of material preparation and waste gas treatment. Background technique [0002] Nitrogen oxides (NO x , including NO and NO 2 ) emissions have become one of the most important sources of air pollution in my country. my country is the world's largest steel producer, and steel sintering flue gas NO x Emissions account for about NO x 10% of the total discharge has not been treated with denitrification, which has seriously threatened the ecological environment and hindered the sustainable development of economy and society. In addition, NO in the flue gas of coal-fired boilers x Pollution control has always been a focus of attention, and denitrification technologies such as selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) have been developed to control NO x (Thermal Power Generati...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/20
Inventor 刘海弟张冬海叶树峰陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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