Supported metallic oxide catalyst for assisting microwave denitration and preparation method and using method thereof

Abstract

The invention discloses a supported metallic oxide catalyst for assisting microwave denitration and a preparation method and a using method thereof. The catalyst is the supported catalyst using carbon as a carrier and using a metallic oxide as an active ingredient. The carrier of the catalyst is carbon-based, is convenient to obtain, large in specific surface area and capable of playing a very good dispersing role on the active ingredient of the catalyst, and the phenomenon of ingredient agglomeration is not produced. The metallic oxide is high in activity, and required supporting amount is small. The carbon-supported metallic oxide has very good microwave absorbing ability, can well play the synergistic effect of microwaves and the catalyst, the catalytic decomposition efficiency of nitrogen oxide is high, the NO decomposition rate can be above 98%, and the catalytic decomposition temperature is low and the loss of the carbon carrier is low by means of the method.

Description

technical field [0001] The invention relates to the technical field of flue gas denitration and purification, in particular to a supported metal oxide catalyst for assisting microwave denitrification, a preparation method and a use method thereof. Background technique [0002] Nitrogen oxides (NOx) are important air pollutants, which mainly come from the combustion of fossil fuels and vehicle exhaust. The excessive emission of nitrogen oxides causes environmental problems such as acid rain, photochemical smog, enhanced greenhouse effect, and ozone layer destruction. Nitrogen oxides are not only the most harmful environmental pollution but also the most difficult to deal with. In the prior art, the harmless removal of NOx can be realized in two ways according to the steady state of N: (1) using oxides to first oxidize NO into NO 2 , and then converted into nitrate or nitric acid; (2) reducing NOx to N which is non-toxic to the environment 2 . The former is transformed int...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the reaction temperature is still relatively high, and the decomposition efficiency is relatively low.

The existing catalytic decomposition method of nitrogen oxides under microwave conditions generally uses ZSM molecular sieve as the carrier. Although it can achieve a certain denitrification efficiency, the preparation process of the carrier is complicated, the hydrothermal stability of the carrier is poor, and the activity of the metal oxide components is low. Many disadvantages such as not high, especially the high loading of active components, even as high as 70%. Excessive loading will lead to a decrease in the specific surface area of ​​the catalyst, and second, it will easily cause catalyst components to agglomerate and deactivate. The metal oxide actually increases the temperature of the local reaction hot spot by enhancing the microwave absorption capacity, and does not really reflect the catalytic effect of the catalyst.