Preparation method of Co3O4 catalyst, and application of the catalyst in catalytic combustion of methane

Abstract

The application discloses a preparation method of a Co3O4 methane catalytic combustion catalyst and an application of the catalyst in low-temperature combustion of methane. The preparation method includes the steps of mixing a polyol water solution of bivalent cobalt salt and a polyol water solution of strong alkali, heating the mixture at a constant temperature in a sealed reaction kettle, and washing, drying and roasting the mixture to obtain the catalyst. The preparation method is low in cost, is simple in preparation and is easy to promote, has high activity, good stability, low ignition temperature, and can achieve complete combustion of methane in low concentration at a low temperature. The catalyst, compared with a noble metal catalyst, is low in cost, so that the catalyst has a potential prospect in the fields of hydrocarbon purification of automobile exhaust, high-effective combustion and utilization of domestic natural gas, etc.

Description

technical field [0001] The invention belongs to the fields of nanomaterial preparation technology and environmental protection, and in particular relates to a preparation method of a tricobalt tetroxide catalyst and an application of the tricobalt tetroxide catalyst prepared by the method in methane catalytic combustion. Background technique [0002] The exhaust gas emitted by motor vehicles contains some hydrocarbons CH x , the hydrocarbon CH x It is formed by the incomplete combustion of fuel in the engine and the volatilization of fuel. as CH x Methane, one of the components, will cause harm to human health at high concentrations, and the emission of methane into the atmosphere will aggravate the "greenhouse effect". In order to reduce its harm to the human body and the environment, it is necessary to purify methane. Methane catalytic combustion can not only improve the energy utilization rate of motor vehicle fuel, but also reduce the production of carbon monoxide in...

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Problems solved by technology

In the existing preparation technology, there are urea combustion method to prepare cerium oxide, zirconia, cobalt oxide solid solution catalyst (CN1623658A) and sol-gel method to prepare copper oxide, cerium oxide solid solution catalyst (CN101811054A), etc., but in these solid solution catalysts The temperature for complete combustion of methane is still relatively high, about 500-680°C and 550°C respectively.

Cobalt tetroxide (Co 3 o 4 ) catalytic materials have high low-temperature catalytic performance, for example, Z.Fei synthesized Co 3 o 4 Nanotubes (Z.Fei, et al, Chem.Commun., 2012, 48, 853-855), but the preparation process is harsh and not suitable for mass production

Patent CN103897757A uses a hydrothermal method to prepare a Co 3 o 4 Supported on cerium-based oxide CeLaxO 2+1.5x On the catalyst, its light-off temperature (T 10 ) is 398-433°C, and at least 90% conversion of methane can be achieved at 448°C (448°C-566°C); however, the light-off temperature (T 10 ) and 90% conversion temperature (T 90 ) is still high, and the catalyst removes the active component Co 3 o 4 In addition, it also contains heavy metals lanthanum and cerium, together with waste residues and wastes generated during its preparation, may cause heavy metal pollution

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