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Chromic oxide catalyst for alkali liquor surface treatment as well as preparation method and application thereof

A surface treatment, chromium oxide technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. The effect of NO release performance, good application prospect and high reactivity

Inactive Publication Date: 2015-07-08
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also reported that cerium oxide has a strong ability to store and release oxygen, which will affect the progress of oxygen-related reactions.

Method used

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  • Chromic oxide catalyst for alkali liquor surface treatment as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take by weighing chromium nitrate 10.0g and directly put into the muffle furnace for 300 o C was calcined for 4h to obtain chromium oxide powder.

[0025] Alkali surface treatment chromium oxide catalyst preparation:

[0026] Using excessive impregnation, soak chromium oxide powder in ammonia solution, the concentration of ammonia water is 25%, after soaking for 12 hours, put it into 100 o After drying in C oven for 12 hours, put it into the muffle furnace at 300 o C was calcined for 4 hours to obtain the chromium oxide catalyst for alkali solution surface treatment.

[0027] Weigh 0.5g of the catalyst obtained above and start feeding reaction gas at room temperature for activity test. The gas composition is 15 ppm NO, the rest is air, and the total flow rate is ≥720 ml / min (STP).

Embodiment 2

[0029] Compared with Example 1, the difference is that the lye is an ammonium bicarbonate solution, and the amount of other materials and operating conditions are the same as in Example 1.

Embodiment 3

[0031] Compared with Example 1, the difference is that the lye is a mixed solution of ammonium bicarbonate and ammoniacal liquor, and the amount of other materials and operating conditions are the same as in Example 1.

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Abstract

The invention relates to a chromic oxide catalyst for alkali liquor surface treatment as well as a preparation method and an application thereof. According to the catalyst, chromic oxide powder is prepared by a precipitation method for a direct roasting method, and the chromic oxide catalyst is prepared in an alkali liquor soaking way and applied to a normal-temperature normal-pressure catalytic oxidation reaction of NO, so that NO can be catalyzed and oxidized into NO2 under a normal pressure at a normal temperature, a very high conversion rate is obtained, and high activity and high stability can be kept for a long time. The catalyst provided by the invention has the advantages of easily acquired raw materials, simple process and very good application prospect.

Description

technical field [0001] The invention relates to a chromium oxide catalyst for surface treatment of lye and its preparation and application, which is mainly aimed at the catalytic oxidation of NO in the environment, is suitable for the elimination of air pollutants, and has application prospects in the field of environmental purification. Background technique [0002] With the rapid development of urbanization, there are more and more semi-enclosed spaces such as tunnels, parking lots, and coal mines. In these semi-enclosed spaces, due to the restriction of natural ventilation, the tail gas emitted by motor vehicles cannot be discharged in time, resulting in the accumulation of pollutants and serious air pollution. Nitrogen oxide (NOx) is one of the main pollutants, which comes from motor vehicles all over the country every year The emission volume is as high as 5.833 million tons, more than 90% of which is nitrogen monoxide (NO). The most commonly used NOx treatment technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26B01J37/02B01D53/86B01D53/56
Inventor 刘爽张岷涛赵昆峰董亚梅王婷何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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