High-activity nano-grade flue gas denitrification catalyst and low-temperature liquid-phase preparation method thereof

Abstract

The invention provides a high-activity nano-grade flue gas denitrification catalyst for removing nitric oxides in fuel gas under a low temperature condition, and a low-temperature liquid-phase preparation method of the high-activity nano-grade flue gas denitrification catalyst. The method does not relate to high-temperature roasting; and the prepared catalyst exists in a manner of a lot of amorphous state mixed oxides, and the activity is obviously improved. The high-activity nano-grade flue gas denitrification catalyst can be widely applied to selective catalytic reduction reaction of the fuel gas under an SO2-free or low-concentration SO2 environment of the fuel gas, so as to reduce the nitric oxides in the fuel gas into N2 and H2O. The catalyst takes a Ti oxide as a main component and is at least loaded with Mn-Ce-M-Ti-Ox of compound oxides of active components Mn and Ce, wherein M represents one or more elements of Fe, Co, Cu, Cr, Zr, Al and V; and the mol ratio of the elements is as follows: Ti: Mn: Ce: M is equal to 1: (0.005-1): (0.005-1): (0-0.3).

Description

technical field [0001] The invention relates to a low-temperature SCR catalyst for removing NOx from flue gas and a preparation method thereof, especially avoiding the high-temperature roasting process in the preparation process of the low-temperature SCR catalyst, effectively improving the specific surface area of ​​the catalyst and reducing the crystallinity of the catalyst, so that the catalyst It exists in the form of a large number of amorphous mixed oxides, which effectively increases the density of active sites on the surface of the catalyst. Background technique [0002] Currently, using ammonia NH 3 As a reducing agent, selective catalytic reduction (SCR) NOx removal technology is the most widely used flue gas denitrification technology. NH 3 , NO and O 2 Oxidation-reduction reactions occur under the action of catalysts to generate N 2 and H 2 O. The catalyst used is mainly V 2 o 5 / TiO 2 series, it has high catalytic activity, and high-temperature roasting...

AI Technical Summary

Problems solved by technology

The catalyst used is mainly V 2 o 5 / TiO 2 series, it has high catalytic activity, and high-temperature roasting process needs to be introduced in the preparation process, which increases the energy consumption of industrial production. At the same time, because the roasting process is easy to destroy the microstructure of the catalyst, it has a certain impact on the activity of the catalyst.