Preparation method and application of modified cobalt manganese binary metal oxide catalyst

A binary metal and oxide technology, which is applied in the field of preparation of modified cobalt-manganese binary metal oxide catalysts, can solve the problems not related to the preparation method of modified cobalt-manganese binary metal oxide catalysts, and achieve the preparation process parameters Easy to control, cost-effective, simple composition effect

Inactive Publication Date: 2014-06-25
YANTAI UNIV
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Problems solved by technology

None of them involve the preparation method of modified cobalt-manganese binary metal oxide catalyst and its application in the decomposition of high-concentration nitrous oxide waste gas

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to Co / Mn=6.5:1 (ratio of the amount of substance), prepare a mixed salt solution of cobalt nitrate and manganese nitrate with a total concentration of metal ions of 0.5mol / L, drop in ammonia solution (mass concentration is 3%, the following The concentration of aqueous ammonia in the embodiment is the same as this), carry out the precipitation reaction, and supplement new aqueous ammonia solution to maintain the pH=10 of the precipitation solution. The precipitate was separated by centrifugation, washed with water until the filtrate was neutral, and dried at 80°C for 12 hours to obtain cobalt-manganese binary metal hydroxide. Calcined at 500°C for 4 hours to obtain cobalt-manganese binary metal oxide. as a catalyst for N 2 O decomposition reaction.

[0025] N 2 O decomposition reaction conditions: take the catalyst into the reaction tube and put it into the reaction furnace. Introduce reaction gas 2%N 2 O / 4%O 2 / 94% Ar (volume percent), the space velocit...

Embodiment 2

[0028] According to Co / Mn=4.0:1 (the ratio of the amount of substance), prepare a mixed salt solution of cobalt nitrate and manganese nitrate with a total concentration of metal ions of 0.5mol / L, drop it into the ammonia solution, carry out the precipitation reaction, and add new ammonia solution to maintain the pH=10 of the precipitation solution. The precipitate was separated by centrifugation, washed with water until the filtrate was neutral, and dried at 80°C for 12 hours to obtain cobalt-manganese binary metal hydroxide. Calcined at 500°C for 4 hours to obtain cobalt-manganese binary metal oxide. as a catalyst for N 2 O decomposition reaction.

[0029] When the reaction temperature is 400°C, N 2 The decomposition percentage of O is 61.5%.

Embodiment 3

[0031] According to Co / Mn=9.0:1 (the ratio of the amount of substance), prepare a mixed salt solution of cobalt nitrate and manganese nitrate with a total concentration of metal ions of 0.5mol / L, drop it into the ammonia solution, carry out the precipitation reaction, and add new ammonia solution to maintain the pH=10 of the precipitation solution. The precipitate was separated by centrifugation, washed with water until the filtrate was neutral, and dried at 80°C for 12 hours to obtain cobalt-manganese binary metal hydroxide. Calcined at 500°C for 4 hours to obtain cobalt-manganese binary metal oxide. as a catalyst for N 2 O decomposition reaction.

[0032] When the reaction temperature is 400°C, N 2 The decomposition percentage of O is 84.1%.

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Abstract

The invention relates to a modified cobalt manganese binary metal oxide catalyst. The modified cobalt manganese binary metal oxide catalyst can be prepared by the following steps: synthesizing a cobalt manganese binary metal hydroxide by a weak base precipitation method, wherein the mass ratio of cobalt to manganese is (4.0-14.0):1; roasting at the temperature of 350 DEG C-550 DEG C so as to prepare a cobalt manganese binary metal oxide; impregnating the cobalt manganese binary metal oxide by auxiliary solutions of potassium carbonate, potassium oxalate or cesium carbonate and the like in equal volume; drying the cobalt manganese binary metal oxide which is impregnated by the auxiliaries at the temperature of 70 DEG C-90 DEG C; roasting the dried cobalt manganese binary metal oxide at the temperature of 350 DEG C-550 DEG C so as to obtain the modified cobalt manganese binary metal oxide catalyst. The raw materials for preparing the catalyst are all inorganic compounds and are harmless to human bodies and environments; moreover, the catalyst is simple in formation, can control preparation technological parameters, is high in activity of the catalyst, and has high cost performance.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a method for preparing a modified cobalt-manganese binary metal oxide catalyst, and the prepared modified cobalt-manganese binary metal oxide catalyst can be used in high-concentration nitrous oxide exhaust gas Applications in decomposition reactions. Background technique [0002] Human-made emissions of greenhouse gases have led to increasing ground temperatures, which has aroused widespread concern. In December 1997, at the third meeting of the parties to the United Nations Framework Convention on Climate Change held in Japan, representatives of 149 countries and regions adopted restrictions on carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, and perfluorocarbons. , sulfur hexafluoride and other six major greenhouse gas emissions "Kyoto Protocol". On February 16, 2005, the protocol came into force. [0003] Man-made nitrous oxide emissions mainly come...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCY02C20/10
Inventor 徐秀峰
Owner YANTAI UNIV
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