Preparation method of nitric oxide normal-temperature catalyst

A nitric oxide and catalyst technology, which is applied in the field of environmental purification of nitrogen oxide gas pollutant treatment, can solve the problems of unsuitable NOx purification treatment, high reaction temperature, complicated process, etc., and achieves the improvement of NOx oxidation absorption efficiency and catalytic oxidation. High efficiency and simple process effect

Inactive Publication Date: 2015-04-22
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its process is more complex and higher at 150-300°C
Chinese patent CN101352645 discloses a flue gas catalytic oxidation denitrification process, using TiO 2 or ZrO 2 -TiO 2 As the carrier, Co is the catalyst of the active component, but also the reaction temperature is too high, so it is not suitable for NOx purification treatment under normal temperature conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Measure 5ml of 20-60 mesh activated carbon and place it in 10ml of nitric acid with a concentration of 5mol / l;

[0022] In an oil bath at 120°C, heat the nitric acid solution for 3 hours; then take out the activated carbon and wash it with deionized water until neutral, and dry it in an oven at 120°C for 3 hours;

[0023] Prepare 5ml of 0.5mol / l urea solution, soak the dried activated carbon in the solution for 8h; then take out the activated carbon and dry it in an oven at 100°C for 5h.

[0024] The nitric oxide catalyst can be obtained by calcining the above-mentioned activated carbon in a vacuum furnace at 350° C. for 3 hours.

[0025] The catalytic performance of the prepared catalyst was evaluated according to the aforementioned test conditions, and it was determined that the catalytic conversion rate of NO was 57-60%, and the basic catalytic effect was basically stable within 10 hours.

Embodiment 2

[0027] Measure 5ml of 20-60 mesh activated carbon and place it in 10ml of nitric acid with a concentration of 2mol / l;

[0028] In an oil bath at 120°C, heat the nitric acid solution for 5 hours; then take out the activated carbon and wash it with deionized water until neutral, and dry it in an oven at 100°C for 5 hours;

[0029] Prepare 5ml of 2.0mol / l urea solution, soak the dried activated carbon in the solution for 8 hours; then take out the activated carbon and dry it in an oven at 100°C for 3 hours.

[0030] The nitric oxide catalyst can be obtained by calcining the above-mentioned activated carbon in a vacuum furnace at 200° C. for 5 hours.

[0031] The catalytic performance of the prepared catalyst was evaluated according to the aforementioned test conditions, and the catalytic conversion rate of NO was determined to be 56-58%, and the basic catalytic effect was basically stable within 10 hours.

Embodiment 3

[0033] Measure 5ml of 20-60 mesh activated carbon and place it in 10ml of nitric acid with a concentration of 5mol / l;

[0034] In a water bath at 80°C, heat the nitric acid solution for 5 hours; then take out the activated carbon and wash it with deionized water until neutral, and dry it in an oven at 120°C for 3 hours;

[0035] Prepare 5ml of 0.5mol / l urea solution, soak the dried activated carbon in the solution for 12 hours; then take out the activated carbon and dry it in an oven at 120°C for 2 hours.

[0036] The nitric oxide catalyst can be obtained by calcining the above-mentioned activated carbon in a vacuum furnace at 300° C. for 4 hours.

[0037] The catalytic performance of the prepared catalyst was evaluated according to the aforementioned test conditions, and it was determined that the catalytic conversion rate of NO was 53-55%, and the basic catalytic effect was basically stable within 10 hours.

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Abstract

The invention relates to a preparation method of a nitric oxide normal-temperature catalyst which is characterized in comprising the steps that: active carbon is placed in a nitric acid solution; heating and impregnation are carried out; the active carbon is fetched and is washed until neutral by using deionized water; the active carbon is dried in a baking oven; the prepared active carbon is impregnated in an urea solution; the active carbon is fetched and dried in a baking oven; and the prepared active carbon is roasted in a vacuum furnace, such that the nitric oxide catalyst is prepared. The catalyst is suitable to be used in environmental conditions of normal temperature, normal pressure, and low concentration (NO is no higher than 20ppm). The method provided by the invention has the characteristics of simple preparation process, high catalytic oxidation efficiency, and the like.

Description

technical field [0001] The invention relates to a preparation method of a normal temperature catalyst, in particular to a preparation method of a nitrogen monoxide catalyst at a normal temperature, which is applied to the field of environmental purification for the treatment of nitrogen oxide gas pollutants. Background technique [0002] Among various air pollutants, the pollution of nitrogen oxides and the harm they cause cannot be ignored. Most of the nitrogen oxides come from fuel combustion, that is, vehicle exhaust, industrial kiln emissions, etc. Nitrogen oxide purification treatment can be divided into dry method and wet method according to the process. Dry methods include non-catalytic reduction methods, catalytic reduction methods, adsorption methods, etc.; wet methods include acid absorption, alkali absorption, oxidation absorption, etc. [0003] Oxidative absorption of nitrogen oxides under oxygen-enriched conditions is one of the current research directions. B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18B01D53/86B01D53/56
Inventor 张豪杰姚炜刘洋周洁邹娟珍何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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