Magnetic iron-based composite oxide catalyst and preparation method thereof

Abstract

The invention provides a preparation method of a magnetic iron-based composite oxide catalyst. According to the preparation method, soluble ferrous salt and soluble titanium salt are prepared into a water solution according to the molar ratio of the iron element to the titanium element of 1:0.1-10, the water solution is stirred magnetically at normal temperature for 0.5-3 hours, and then a mixed solution is obtained; the mixed solution is stirred mechanically at normal temperature under a mechanically sealed condition or the condition that nitrogen is led into to remove oxygen, excessive alkaline precipitators are added dropwise at the same time till the pH is equal to 9-10, and after the mixed solution is completely precipitated, the precipitate is filtered and washed to obtain a filter cake; the filter cake is dried, then the processed filter cake is put in a muffle furnace for calcined activation for 3-6 hours at the temperature of 300-600 DEG C, and the magnetic iron-based composite oxide catalyst is prepared. According to the magnetic iron-based composite oxide catalyst, non-toxic components are adopted, and harm to human health and the ecological environment will not be caused; under the condition of a high air speed ratio, the catalyst has good medium and low temperature denitration cavity and can be used for removing nitric oxide in exhaust fume at a fire coal fixing source.

Description

technical field [0001] The invention belongs to the technical field of catalysts and their preparation, and in particular relates to a magnetic iron-based composite oxide catalyst and a preparation method thereof. Background technique [0002] The flue gas emitted by coal-fired stationary sources such as thermal power plants contains a large amount of nitrogen oxides, sulfur oxides, and carbon dioxide, among which nitrogen oxides (NO x , mainly NO and NO 2 ) will cause major environmental problems such as acid rain, photochemical smog, ozone depletion and greenhouse effect, and cause great harm to the ecological environment and human health. [0003] At present, for the NO in the tail flue gas of coal-fired stationary sources such as thermal power plants x Purification technologies mainly include: low NO x Combustion technology, reburning and advanced reburning technology, selective non-catalytic reduction technology (SNCR) and selective catalytic reduction technology (NH...

AI Technical Summary

Problems solved by technology

And studies have shown that: magnetic γ-Fe 2 o 3 The denitrification performance is better than that of non-magnetic α-Fe 2 o 3 ; but the magnetic γ-Fe 2 o 3 The medium and low temperature denitrification activity is low, and the preparation process is not mature enough, which limits its large-scale industrial application; if the denitrification temperature window can be extended to the medium and low temperature region, and the medium and low temperature SCR denitrification activity can be improved at the same time