Supported metal oxide catalyst for assisted microwave denitrification, preparation method and use method thereof

Abstract

The invention discloses a supported metal oxide catalyst for assisting microwave denitrification, a preparation method and a use method thereof. The catalyst is a supported catalyst with carbon as a carrier and metal oxide as an active component; the catalyst The carrier is carbon, not only the source is convenient, but also the specific surface area is large, which can play a good role in dispersing the active components of the catalyst, and there will be no agglomeration between the components; the metal oxides used have high activity and the required loading The amount is small; carbon-supported metal oxides have good microwave absorption capacity, and can well exert the synergistic effect of microwaves and catalysts. The catalytic decomposition efficiency of nitrogen oxides is high, and the decomposition rate of NO can be as high as 98%. The catalytic decomposition temperature of the method is low, and the loss of the carbon carrier is low.

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.