A kind of preparation method of Mn-ce-ti-o composite metal oxide catalyst

Abstract

The invention discloses a preparation method of a Mn-Ce-Ti-O composite metal oxide catalyst. The operation steps are (1) adding ethanol dropwise to tetrabutyl titanate; (2) dissolving manganese nitrate and cerium nitrate in ethanol Obtain the mixed solution of manganese nitrate and cerium nitrate; (3) join mixed solution in the material obtained in step (1), add citric acid to stir and dissolve and leave standstill to carry out an aging; (4) gac is added to step (3) The material obtained after the primary aging is subjected to secondary aging; (5) drying, grinding and calcining in sequence to obtain the Mn-Ce-Ti-O composite metal oxide catalyst. The catalyst prepared by the method of the present invention has high NOx elimination ability, high purity, and good dispersibility; through the addition ratio of manganese and cerium oxides limited by the present invention, the sol-gel can be better aggregated together to obtain a particle size Smaller particles, with greater surface area, expose more adsorption sites.

Description

technical field [0001] The invention relates to a preparation method of a metal oxide catalyst, in particular to a preparation method of a Mn-Ce-Ti-O composite metal oxide catalyst. Background technique [0002] Among the transition metals, manganese oxides have different types of variable valence oxygen, which is beneficial to the catalytic cycle and has very prominent low-temperature catalytic properties. A variety of oxide species of Mn, such as MnO, MnO 2 , Mn 2 o 3 , Mn 3 o 4 , Mn 5 o 8 etc., under the same specific surface condition, MnO 2 It has higher low-temperature reaction activity. In the preparation process, different precursors will also lead to different oxidation states of the prepared catalyst. When the precursor is manganese nitrate, the oxide of Mn is mainly MnO 2 Exists in the form of Mn, when the precursor is manganese acetate, the oxidation state of Mn is mainly shown as Mn 2 o 3 . However, the anti-poisoning ability of manganese oxide is low,...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many technical methods for Mn-Ce-Ti-O composite metal oxide catalysts, among which co-precipitation method, sol-gel method, and hydrothermal synthesis method are very typical traditional methods, and the preparation of many materials is Prepared by this method or by the extension or combination of these methods, therefore, they play a very important role in the preparation and research of solid catalytic materials, but there are many shortcomings in these methods, causing the prepared The catalytic activity of the catalyst is not ideal, and the transition metal oxides prepared by it have many shortcomings such as insufficient NOx elimination ability, poor low temperature effect, and narrow temperature window for elimination.

For this kind of two-by-two composite method, there is no fixed operating condition, and the scope of use is limited. At the same time, the activity of the prepared catalyst is unstable, the dispersion is not good, and the preparation cycle is too long, so that the scope of application is still not wide enough.

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