Alumina-based nitric oxide normal temperature catalyst and preparation method

Abstract

The invention provides an alumina-based nitric oxide normal temperature catalyst which comprises, by mass, 96 to 99.5% of alumina and 0.5 to 4% of a transition metal oxide. The invention further provides a preparation method for the alumina-based nitric oxide normal temperature catalyst. The method is characterized in that the alumina-based nitric oxide normal temperature catalyst is prepared with a surfactant as a template and an ammonium salt as an auxiliary agent and through synthesis of the transition metal porous oxide by loading a nitrate on the surface of an alumina ball and the method comprises the following concrete steps: mixing the surfactant, the nitrate and an ammonium salt solution in order and carrying out continuous stirring; dipping the alumina ball in an solution obtained in the previous step at normal temperature and carrying out drying; and roasting the dried alumina ball in a muffle furnace so as to obtain the nitric oxide catalyst. Catalysis efficiency of the catalyst prepared by using the method on nitric oxide at normal temperature is up to 40%, and the catalyst has the characteristics of simple preparation technology, high catalytic oxidation efficiency, etc.

Description

technical field [0001] The invention relates to a nitrogen monoxide catalyst at normal temperature and a preparation method thereof, in particular to an alumina-based nitrogen monoxide catalyst at normal temperature and a preparation method thereof. It is used in the field of environmental purification for the treatment of nitrogen oxide gas pollutants. Background technique [0002] Among various air pollutants, nitrogen oxides (NO X ) pollution and the harm it causes cannot be ignored. Most of NOx comes from fuel combustion, that is, vehicle exhaust, industrial kiln emissions, etc. NOx purification treatment can be divided into dry method and wet method according to the process. Dry methods include non-catalytic reduction methods, catalytic reduction methods, adsorption methods, etc.; wet methods include acid absorption, alkali absorption, oxidation absorption, etc. [0003] Oxidation and absorption of NOx under oxygen-enriched conditions is one of the current research ...

AI Technical Summary

Problems solved by technology

[0004] In the research on the catalytic oxidation of nitric oxide, Chinese patent CN101822983A discloses a kind of mesoporous silica as the carrier, one or two mixtures of potassium and molybdenum as the doping component, and platinum as the active component. Catalyst for catalytic oxidation of nitrogen oxides in flue gas prepared by one-step impregnation method, but the process is more complicated, and the reaction temperature is higher at 150-300 °C

Chinese patent CN101352645 discloses a flue gas catalytic oxidation denitrification process, using TiO 2 or ZrO 2 -TiO 2 As the carrier, Co is the catalyst of the active component, but also the reaction temperature is too high, so it is not suitable for NOx purification treatment under normal temperature conditions