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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AI-Extracted Technical Summary

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

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Method used

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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.

Application Domain

Dispersed particle separationMetal/metal-oxides/metal-hydroxide catalysts

Technology Topic

Rare-earth elementIndustrial waste +15

Image

Examples

Experimental program(4)
Effect test(1)

Example Embodiment

[0054]Example 1

[0055]Dry the block-containing tantantite-containing high slag, placed in a powder grinding tank, and then taking 100 g of titanium-containing high-containing slag powder and 5g analysis pure CEO210g analysis pure MNO2And 34.5 g of NaOH particles mixed abrasion in magnesium oxide crucible, first temperature rise to 350 ° C for 1 h to remove binding water and volatile impurities, and then heated in a muffle in a muffle at a heating rate of 5 ° C / min to 1500 ° C Insulation 1H is cooled to room temperature, resulting in Ce, MN-based optimization of heavy hood, and is described as 1-Example 1, and its X-ray diffraction image such asfigure 1 , Scanning electron microscope imageimage 3 X-ray energy spectrum analysis is shown in Table 1.

[0056]Table 1: X-ray energy spectrum analysis of 1-Example 1 in Example 1 (AT%, combinedimage 3 )

[0057]

[0058]Then, 1-Example 1 was broken, and then placed in the ball milling tank, the ball milling was pulled, and the filtration was dried and grounded, and 16 g was poured into 240 mL of 8% HCl solution to extract for 1 h to peel off the non-target component, and then The mixed solution was diluted 5 times to continue to be stirred for 20 min, and the filtration washing and drying were carried out, which was a high-efficiency response optically coupled low temperature denitrifying catalyst material, which is 2-Example 1, which is X-ray diffraction image such asfigure 2 The chemical composition analysis is shown in Table 3.

[0059]byfigure 1 X-ray diffraction image andimage 3 Scanning electron microscope images can be drawn: based on titanium-containing high slag, use CEO2Mno2After high temperature in situ doping modification, the main mineral phase evolved into a calcium titanium phase phase (region 1) and the sodium-magnesium aluminosilicate phase (region 2 and region 3) and a small amount of magnesium that is easily dissolved. The enrichment of manganese oxide (region 4).

[0060]It is understood by Table 1, the Ti content in the sodium aluminosilicate phase is very low, indicating that Ti in the raw granulation phase of the raw stone group is enriched into a perovskite phase in the illegal CAO phase in the raw CaO in the original titanium residue; in X-ray diffraction image The presence of magnesium mangoxide is not detected, and it is also shown that this phase is too small in the modified residue.

Example Embodiment

[0061]Example 2

[0062]The block-containing titanium-containing high slag was broken, placed in a powder mill, and then taking 100 g of titanium-containing high-flavored high-containing powder and 1 g analysis pure CEO.2, 1G analysis pure MNO2And 5.1 g of NaOH particles mixed polishing well in the magnesium oxide crucible, first warmed to 250 ° C for 0.5 hours to remove the combined water and volatile impurities, and then heated in a muffle in a muffle at a temperature increase of 3 ° C / min to 1350 The incubation of ° C was cooled to room temperature, obtained by Ce, MN-based optimized heavy strut, and X-ray diffracted image, such as 1-Example 2, X-ray diffraction imagefigure 1.

[0063]Then, 1-Example 2 was broken, and then placed in the ball milling, the ball milling was placed, and the filtration was dried and grounded, and 16 g was poured into 80 mL of the 1% HCl solution to extract 2 h to peel off the non-target component, and then The mixed solution was diluted 4 times to continue to be stirred for 10 min, and the filtration washing and drying were carried out as having a high efficiency response photocoupled low temperature denitrifying catalyst material, and the X-ray diffraction image is as follows.figure 2.

Example Embodiment

[0064]Example 3

[0065]The block-containing titanium-containing high slag was dried, placed in a powder grinding tank, and then taking 100 g of titanium-containing high-containing high slag powder and 10g analysis pure CEO.230g analysis pure MNO2And 21 g of NaOH particles mixed abutment in the magnesium oxide crucible, first temperature rise to 300 ° C for 1 h to remove the combined water and volatile impurities, and then heat the temperature of 10 ° C / min to 1500 ° C heat insulation 1H is cooled to room temperature, resulting in Ce, MN-based optimization of heavy struts, rejected as 1-Example 3, which X-ray diffraction image isfigure 1.

[0066]Then, 1-Example 3 was broken, and then placed in the ball milling, the ball milling was pulled, and the filtration was dried and grounded, and 16 g was poured into 400 ml of 20% HCl solution to extract 1 h to peel off the non-target component, and then The mixed solution was diluted 10 times to continue to be stirred for 10 min, and the filtration washing and drying were carried out as having a high efficiency response optically coupled low temperature denitrifying catalyst material, and the X-ray diffraction image is as described in Example 3.figure 2.

PUM

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