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A kind of monolithic chromium oxide catalyst for alkali treatment and its preparation method and application

A monolithic catalyst and chromium oxide technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the problem of low catalytic efficiency of catalyst and embedding of active components , Low specific surface area and other issues, to achieve the effect of improving NO storage performance, improving stability, and increasing specific surface area

Inactive Publication Date: 2015-08-26
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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  • A kind of monolithic chromium oxide catalyst for alkali treatment and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of monolithic catalysts with chromium oxide coating by impregnation method:

[0022] Weigh 100.0g of chromium nitrate and dissolve it in 200ml of deionized water, stir at room temperature, dissolve 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.

[0023] Alkali treatment method prepares monolithic chromium oxide catalyst:

[0024] In the way 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 100 o After drying in an oven for 12 h, the catalyst was calcined at 300 °C for 4 h in a muffle furnace to obtain the catalyst.

[0025] 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 re...

Embodiment 2

[0027] 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

[0029] 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 relates to an alkali liquor treated integral chrome oxide catalyst, a preparation method and an application. According to the catalyst, an active ingredient chrome is soaked to an inert carrier cordierite honeycomb ceramic with a soaking method, the specific surface area of the integral catalyst is increased with an alkali liquor treatment method after drying and roasting, the chemical state of the active ingredient is changed, the active site is increased, and NO catalytic oxidation reactivity and the long-time stability under normal pressure and temperature are improved. According to the catalyst, the preparation method and the application, the process is simple, raw materials are easy to obtain, and engineering application is realized.

Description

technical field [0001] The invention relates to the application of a monolithic chromium oxide catalyst prepared by an alkali treatment method, 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 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 ...

Claims

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Application Information

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