High-stability nano cerium oxide material for catalyzing and oxidizing ortho-xylene at low temperature and application thereof

Abstract

The invention provides a cerium oxide nano cubical material which has excellent thermal stability and can catalyze and oxidize ortho-xylene into harmless CO2 and H2O with high efficiency under a condition of low temperature and a preparation method thereof. The preparation method of the material comprises the following steps of: taking soluble cerium salt as a precursor, adding excessive sodium hydroxide as a precipitator, then transferring the excessive sodium hydroxide into a reaction kettle, keeping the temperature constant within a range of 80-120 DEG C for 8-12h, washing the obtained precipitate with deionized water, drying over night and calcining at the temperature of 350-750 DEG C in a muffle furnace to obtain a nano cerium oxide cube. The method has the advantages of simple preparation method, low price and easy acquirement of raw materials, controllable appearance of the obtained material and the like; and the prepared nano material presents favorable uniformity, monodispersity and thermal stability and can be used as a catalyst and a carrier of the catalyst. Nano cerium oxide in the invention is used as the catalyst, can directly oxidize the ortho-xylene into the CO2 and the H2O within a temperature range of 140-260 DEG C, does not generate a by-product, represents favorable low-temperature catalytic activity and has higher practical value.

Description

technical field The invention relates to a kind of product with excellent thermal stability, which can efficiently catalyze and oxidize o-xylene into harmless CO under low temperature conditions. 2 and H 2 O cerium oxide nanocube materials and methods for their preparation. Background technique Ortho-xylene is a volatile organic pollutant (VOCs) with a wide range of sources, and it is one of the main pollutants in indoor and outdoor air. Outdoor sources mainly come from the production of chemical raw materials such as paints, coatings, lubricants, etc., the incineration of industrial waste, and the emission of motor vehicle exhaust. The interior is mainly produced through home decoration and home life. O-xylene can enter the human body through inhalation, ingestion and skin contact, and cause varying degrees of damage to human tissues and organs, especially women and children. Studies have found that short-term exposure to xylene gas can irritate the mucous membranes of...

AI Technical Summary

Problems solved by technology

When the nano-cerium oxide prepared by the above-mentioned several methods is used as a catalyst or a catalyst carrier, the above-mentioned method also has the following disadvantages: (1) surfactants or organic solvents are introduced into the reaction system; (2) the prepared samples are many without roasting

Good stability is one of the key factors that determine whether the catalyst can be used in practice. When the uncalcined material is used as the catalyst or catalyst carrier, its stability cannot be guaranteed when it experiences the high temperature environment that may occur in the catalytic reaction, which affects its practical application

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