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Monolithic chromium oxide catalyst as well as preparation method and application thereof

A monolithic catalyst and chromium oxide technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low catalytic efficiency of catalysts, embedding of active components, low specific surface area, etc. Achieve the effects of improving NO storage performance, improving stability, and increasing specific surface area

Inactive Publication Date: 2014-08-20
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts prepared by the above methods usually have problems such as low loading, embedding of active components, and low specific surface area, so that the catalytic efficiency of monolithic catalysts is low.

Method used

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  • Monolithic chromium oxide catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of monolithic catalysts with chromium oxide coating by impregnation method:

[0021] Weigh 100.0g of chromium nitrate and dissolve it in 200ml of deionized water, stir at room temperature, after dissolving evenly, pour it on the cordierite honeycomb ceramic carrier, after repeated dipping, dry at 100°C, and bake at 300°C for 4 hours to obtain a chromium oxide coating monolithic catalyst.

[0022] Alkali treatment method prepares monolithic chromium oxide catalyst:

[0023] Using the method of excessive impregnation, soak the monolithic catalyst with chromium oxide coating prepared above in lye, ammonia water, pH = 8-10, after soaking for 2 hours, put it in a 100°C oven to dry for 12 hours, put it in a horse Calcined at 300°C for 4h in a Furnace to obtain the catalyst.

[0024] Put the above-prepared 10*10*10cm monolithic catalyst in the reactor, pass the reaction gas at room temperature, and conduct the activity test. The gas composition is 15 ppm NO, the ...

Embodiment 2

[0026] 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

[0028] Compared with Example 1, the difference is that the lye is a KOH mixed solution, and the amount of other materials and operating conditions are the same as in Example 1.

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Abstract

The invention discloses a preparation method for a monolithic chromium oxide catalyst. The preparation method comprises the following steps: preparing a monolithic catalyst provided with a chromium oxide coating by adopting an impregnation method: weighing a chrome precursor and dissolving the chrome precursor in deionized water, stirring the solution at normal temperature, pouring the chrome precursor on a cordierite honeycomb ceramic carrier after the chrome precursor is dissolved uniformly, after the cordierite honeycomb ceramic carrier is impregnated repeatedly, drying at 100 DEG C, and roasting for 4 hours at 300 DEG C to obtain the monolithic catalyst provided with the chromium oxide coating; preparing the monolithic chromium oxide catalyst by an alkaline liquid processing method: soaking the monolithic catalyst provided with the chromium oxide coating prepared by the step (1) in an alkaline liquid in an excessive impregnating way, wherein the PH of the alkaline liquid is 8 to 10, soaking the monolithic catalyst provided with the chromium oxide coating, roasting the monolithic catalyst provided with the chromium oxide coating for 2 to 6 hours after being dried for 12 hours, thereby obtaining the alkaline liquid surface processed monolithic chromium oxide catalyst. The catalytic oxidation of a NO reaction at normal temperature is realized; NO can be eliminated at the normal temperature; the engineering application is realized. The catalyst disclosed by the invention has a good application prospect because raw materials are easily available and the process is simple.

Description

technical field [0001] The invention relates to an integral chromium oxide catalyst and its preparation method and application, mainly aimed at the catalytic oxidation of NO in the environment, 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 exhaust gas emitted by motor vehicles cannot be discharged in time, resulting in the accumulation of pollutants. The air pollution is serious, and nitrogen oxides (NOx) are one of the main pollutants. The annual emissions from motor vehicles in the country are as high as 5.833 million tons, and more than 90% are nitrogen monoxide (NO). The integral catalyst is to realize the engineering NO The key to purification. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01J37/00B01D53/86B01D53/56
Inventor 何丹农刘爽赵昆峰高振源董亚梅王婷
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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