Efficient response optical coupling denitration catalyst and preparation method thereof

Abstract

The invention discloses an efficient response optical coupling denitration catalyst and a preparation method thereof, and belongs to the technical field of blast furnace slag application. The preparation method of the product comprises the following steps: uniformly mixing the titanium-containing blast furnace slag with the rare earth element oxide, the transition metal oxide and a certain amount of sodium hydroxide, heating to melt, reconfiguring a silicate phase while solid-dissolving transition group elements into a perovskite phase, and stripping the silicate phase through acid leaching treatment, thereby finally obtaining the perovskite-based functional material. The obtained product is the optical coupling low-temperature denitration catalyst with efficient response activity. According to the catalyst prepared by the method disclosed by the invention, the removal rate of NOx can reach 100% and the N2 selectivity can reach 92% under a low-temperature condition (140 DEG C) in a manner of adding a light source, so that the denitration catalyst capable of efficiently responding under the low-temperature condition is prepared at low cost in a short process; and the method disclosed by the invention has great significance in high-added-value application of the titanium-containing blast furnace slag and continuous and efficient removal of NOx in industrial waste gas.

Description

technical field [0001] The invention belongs to the technical field of blast furnace slag application, and in particular relates to a catalyst with high-efficiency response optically coupled low-temperature denitrification performance prepared by using titanium-containing blast furnace slag as a raw material through one-step modification. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants that cause photochemical smog, acid rain, nitrate aerosol, ozone layer hole and greenhouse effect, and is also one of the pathogenic sources of human respiratory system, cardiovascular disease and diabetes. With the enhancement of people's awareness of environmental protection, for the deteriorating air pollution and the continuous growth of NO x Emissions, the state has stricter requirements on nitrogen oxide emissions. "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) stipulates that coal-fired boilers NO x Emissions sha...

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Problems solved by technology

However, in the previous research of our research group, the preparation method of the catalyst was a two-step fire method, which required large energy consumption and complicated processes. At the same time, NaCO 3 As an alkaline thermal modifier will generate CO 2 Such gas is generated to cause slurry splashing, and there are risks in the high-temperature preparation process of the catalyst, and the catalyst preparation method is limited by the optimization of the fire method and the wet method, and the catalyst performance cannot meet the higher requirements

[0010] As an important secondary resource, titanium-containing blast furnace slag does not contain heavy metals and radioactive elements. The perovskite phase contained in it has significant photoresponse activity, and the rich Fe and other elements in blast furnace slag are used for photothermal coupling. It is possible to denitrate, but because the perovskite phase in titanium slag is wrapped by pyroxene phase, and a part of titanium is distributed in the pyroxene phase, which leads to poor intrinsic photoactivity of titanium slag, which greatly limits its application.

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