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Efficient response optical coupling denitration catalyst and preparation method thereof

A denitrification catalyst and optical coupling technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as large energy consumption, complex process, and poor photoactivity

Pending Publication Date: 2021-04-20
安徽工业大学科技园有限公司
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  • Description
  • Claims
  • Application Information

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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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  • Efficient response optical coupling denitration catalyst and preparation method thereof
  • Efficient response optical coupling denitration catalyst and preparation method thereof
  • Efficient response optical coupling denitration catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] The blocky titanium-containing blast furnace slag was crushed and dried, placed in a grinding tank for grinding for 60 seconds, and then 100 g of titanium-containing blast furnace slag powder was mixed with 5 g of analytically pure CeO 2 , 10g analytically pure MnO 2 and 34.5g NaOH particles were mixed and ground evenly and placed in a magnesia crucible, first heated to 350°C for 1 hour to remove bound water and volatile impurities, and then heated to 1500°C in a muffle furnace at a heating rate of 5°C / min Insulated for 1h and cooled to room temperature with the furnace to obtain Ce, Mn-based optimized reconstruction slag, which is denoted as 1-embodiment 1, and its X-ray diffraction image is as follows figure 1 , scanning electron microscope images such as image 3 , X-ray energy spectrum analysis is shown in Table 1.

[0056] Table 1: X-ray energy spectrum analysis of 1-embodiment 1 in embodiment 1 (at%, combine image 3 )

[0057]

[0058] Then 1-Example 1 was...

Embodiment 2

[0062] The blocky titanium-containing blast furnace slag was crushed and dried, placed in a grinding tank for grinding for 60 seconds, and then 100 g of titanium-containing blast furnace slag powder was mixed with 1 g of analytically pure CeO 2 , 1g analytically pure MnO 2 and 5.1g of NaOH particles were mixed and ground evenly and placed in a magnesia crucible, first heated to 250°C for 0.5h to remove bound water and volatile impurities, and then heated to 1350°C in a muffle furnace at a heating rate of 3°C / min ℃ for 2 hours and cooled to room temperature with the furnace to obtain Ce, Mn-based optimized reconstruction slag, which is recorded as 1-Example 2, and its X-ray diffraction image is as follows figure 1 .

[0063] Then 1-Example 2 was crushed and ground, then placed in a ball mill jar for ball milling for 20 hours, after suction drying and grinding, 16 g was poured into 80 ml of 1% HCl solution and leached for 2 hours to strip off non-target components, and then Dilu...

Embodiment 3

[0065] The blocky titanium-containing blast furnace slag was crushed and dried, placed in a grinding tank for grinding for 60 seconds, and then 100 g of titanium-containing blast furnace slag powder was mixed with 10 g of analytically pure CeO 2 , 30g analytically pure MnO 2 and 21g of NaOH particles were mixed and ground evenly and placed in a magnesia crucible, first heated to 300°C for 1 hour to remove bound water and volatile impurities, and then heated to 1500°C in a muffle furnace at a heating rate of 10°C / min. 1h is cooled to room temperature with furnace, obtains Ce, Mn base optimization reconstruction slag, is recorded as 1-embodiment 3, and its X-ray diffraction image is as follows figure 1 .

[0066] Then 1-Example 3 is crushed and ground, then placed in a ball mill jar for ball milling for 12 hours, after suction drying and grinding, 16 g is poured into 400 ml of 20% HCl solution and leached for 1 hour to strip off non-target components, and then Dilute the mixed...

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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...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/56
Inventor 吕辉鸿季益龙丁博代兵倪文雷昭
Owner 安徽工业大学科技园有限公司
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