Cerium-manganese molecular sieve catalyst and preparation method and application thereof

Abstract

The invention provides a preparation method of a cerium-manganese molecular sieve catalyst, comprising the steps of adding permanganate solution into a solution containing a divalent manganese sourceand a cerium source, and adding an acid to adjust pH to obtain a reaction solution; adding the reaction solution into a reactor, and allowing hydrothermal reaction to occur to obtain the cerium-manganese molecular sieve catalyst, wherein the addition of the reaction solution account's 30-80% by volume of the reactor. The cerium-manganese molecular sieve catalyst is prepared by a one-step hydrothermal process; by adjusting the reaction parameters, particularly filling rate of the reaction solution, ozone decomposition catalytic activity is improved; the ozone conversion rate under the normal temperature of 30 DEG C, space velocity of 600000 h<-1> and relative humidity of 45% may reach 95% and above; the catalyst herein has long life, up to 20 days and longer; the cost of the catalyst is greatly reduced; the preparation method is simple and feasible and can provide filling rate index for the industrial production of catalysts.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a cerium-manganese molecular sieve catalyst, its preparation method and application, in particular to a cerium-manganese molecular sieve catalyst, its preparation method and its application in the field of ozone decomposition. Background technique [0002] Ozone (O 3 ) is an allotrope of oxygen, which is unstable at room temperature and has a double-edged sword effect on the environment on which human beings live. In the stratosphere, ozone is beneficial to the living environment of human beings, and it can resist harmful The ultraviolet rays of the earth directly shine on the earth, but near the surface, the ozone is more harmful, and it will have different degrees of impact on the human skin, immune system and nervous system. Part of the ozone that people are exposed to comes from the ozone generated by photochemical reactions of nitrogen oxides and volatile organic compounds ...

AI Technical Summary

Problems solved by technology

[0004] CN 101711990 A discloses a molecular sieve catalyst loaded with metal oxides, including pure cryptopotassium manganese dioxide and transition metals, using potassium permanganate and manganese acetate raw materials to prepare manganese oxide octahedral molecular sieves by reflux and roasting methods (OMS-2), and then roasted after impregnated with transition metal salt solution to obtain a molecular sieve catalyst supported by transition metal oxides, but the preparation method is relatively complicated, and the reaction process is not easy to control, and it is mainly used for ethanol and acetaldehyde in automobile exhaust. oxidation removal

CN 104001502 A discloses a cerium-manganese catalyst for decomposing ozone at room temperature and high humidity, which is prepared by hydrothermal reaction using divalent manganese source, cerium source and potassium permanganate as raw materials, but this method is only suitable for small-scale preparation Catalyst, and the service life is short, which limits the expansion of its application range