Cobalt-based catalyst and preparation method and application thereof

Abstract

The invention relates to a cobalt-based catalyst and a preparation method and application thereof. The cobalt-based catalyst is a mesoporous material formed by nanocrystallines, the specific area of the mesoporous material is 23.38-172.28 m<2> / g, and the grain size is 4.5-15.5 nanometers. The cobalt-based catalyst comprises a mixture of one or more oxides of ferrite, cobaltosic oxide, nickel oxide and manganese oxide, wherein the atomic ratio of cobalt to iron to nickel is 1:(0.060-0.10):(0-2.16), or the atomic ratio of cobalt to iron to manganese is 1:0.28:2.97, or the atomic ratio of cobalt to nickel is 1:(0.23-3.65). The cobalt-based catalyst disclosed by the invention can be used for effectively reducing the methane initiation temperature and enhancing the methane combustion rate by using a transition metal composite oxide obtained through a low-temperature oxidation reduction-concentration crystallization or oxalate co-precipitation-heat treatment process for a methane catalyst, and has the advantages of low cost, simple preparation process and easiness for popularization; a synthesized substance has the characteristics of high specific area, adjustability in size, composition and texture and the like, and is an excellent low-temperature methane catalysis material.

Description

technical field [0001] The invention relates to the field of nanocomposite technology, in particular to the preparation and application of a low-cost and high-efficiency cobalt-based low-temperature methane combustion catalyst. Background technique [0002] With the rapid development of China's economy, the number of automobiles has increased rapidly, and automobile exhaust has become one of the main sources of urban air pollution. Studies have shown that 70%–80% of pollutants (CO, HC, NO x , PM) is generated when the car is cold started, that is, it is generated during the first 0–180s of starting. Therefore, it can effectively solve the problem of pollutants generated during cold start of automobiles, improve the living environment of human beings, and improve the quality of human living space. Compared with the optimized combustion technology, the method of improving the performance of the tail gas purifier so that it can have a higher purification capacity at low tempe...

AI Technical Summary

Problems solved by technology

The first type, precious metal catalyst: this type of catalyst has low activation temperature and low complete conversion temperature, but the precious metal component is easy to lose at high temperature, the catalyst is easy to sinter and age, and the preparation price is high, so the use of this catalyst is limited

The second category, non-precious metal catalysts: can be specifically divided into single-component transition metal oxide catalysts, hexaaluminate catalysts and perovskite metal oxide catalysts. Compared with noble metal catalysts, this type of catalyst has low cost, but Performance needs to be further improved

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