Preparation method for composite denitration catalyst with layered structure

A denitration catalyst, layered structure technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of limited scale application, low catalyst effect, narrow temperature window, etc.

Active Publication Date: 2018-06-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Rejeb R, Boudali L, Delahay G, Petitto C. Top Catal, 2017, 60, 230-237 reported the use of TiCl 4 The solution is intercalated into montmorillonite, and then the active component is loaded with molybdenum oxide. The effect of the prepared denitration catalyst is lower than that of the commercial vanadium-based catalyst.
However, the denitration catalyst or active component prepared by the above method uses vanadium oxide, or the catalyst effect of the preparation is not high, and the temperature window is narrow, and contains a relatively high content of alkali metal (sodium ion or potassium ion), which limits its further development. Scale application

Method used

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  • Preparation method for composite denitration catalyst with layered structure
  • Preparation method for composite denitration catalyst with layered structure
  • Preparation method for composite denitration catalyst with layered structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) With 150g of 1.0wt% oxalic acid solution, add 1.6g of ammonium molybdate and stir to dissolve, then add 25.4g of cerium nitrate to its dissolution, and pre-prepared 30wt% organic (hexadecyltrimethylammonium bromide) Add 50 g of modified montmorillonite (organic matter content: 30 wt%) slurry to the above solution, place it at 20° C. and stir for 3 days to obtain a suspension, wherein the molar ratio of molybdenum to cerium is 0.15:1;

[0024] (2) Stir the above suspension at 80°C for 6h to obtain a mixture, then add 0.10g (accounting for 0.2wt% of the mixture) of polyethylene oxide, stir the mud, extrude, and dry at 120°C for 8h to obtain a catalyst Precursor;

[0025] (3) The above catalyst precursor was placed in a muffle furnace and calcined at 550° C. for 5 h to obtain a sample, wherein the total content of cerium and molybdenum metal elements was 44%. The transmission electron microscope image of the prepared catalyst is shown in figure 1 As shown, it can be ...

Embodiment 2

[0028] (1) With 120g of citric acid solution of 1.5wt%, stir and add 1.0g ammonium molybdate to its dissolution, then add 14.4g of cerium chloride to its dissolution, pre-prepared 18wt% organic (tetradecyltrimethyl Ammonium bromide) modified attapulgite (organic matter content 25wt%) slurry 80g was added to the above solution, placed at 30°C and stirred for 2 days to obtain a suspension, wherein the molar ratio of molybdenum to cerium was 0.1:1;

[0029] (2) Stir the above suspension at 100°C for 4h to obtain a mixture, then add 0.2g of polyethylene oxide (accounting for 0.35wt% of the mixture), stir the mud, extrude, and dry at 110°C for 16h to obtain a catalyst Precursor;

[0030] (3) The above catalyst precursor was put into a muffle furnace and calcined at 600° C. for 4 hours to obtain a sample, wherein the total content of cerium and molybdenum metal elements was 39%.

[0031] (4) Denitrification rate test: the composition of the simulated gas is: NO (850ppm), NH 3 (850...

Embodiment 3

[0033](1) With 150g of 2.0wt% oxalic acid solution, stir and add 1.4g ammonium paramolybdate until it dissolves, then add 25.4g cerium nitrate until it dissolves, the pre-prepared 20wt% organic (octadecyl trimethyl bromide Ammonium chloride) modified montmorillonite (organic matter content 35wt%) slurry 75g was added to the above solution, placed at 40°C and stirred for 1 day to obtain a suspension, wherein the molar ratio of molybdenum to cerium was 0.15:1;

[0034] (2) Stir the above suspension at 90°C for 5h to obtain a mixture, then add 0.3g of polyethylene oxide (accounting for 0.55wt% of the mixture), stir the mud, extrude, and dry at 100°C for 24h to obtain a catalyst Precursor;

[0035] (3) The above catalyst precursor was placed in a muffle furnace and calcined at 500° C. for 6 hours to obtain a sample, in which the total content of cerium and molybdenum metal elements was 42%.

[0036] (4) Denitrification rate test: the composition of the simulated gas is: NO (850pp...

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Abstract

The invention relates to a preparation method for a composite denitration catalyst with a layered structure. The catalyst is prepared with organic modified layered clay, cerium salt and molybdate as precursors through adsorption, impregnation, extrusion molding, drying and calcination, wherein the mol ratio of molybdenum to cerium in the catalyst is (0.10-0.25): 1; and the total mass of cerium andmolybdenum metal elements accounts for 35 to 50% of the mass of the catalyst. The catalyst has large surface area; composite oxide nanoparticles are uniformly dispersed in the layered structure of the clay; the catalyst used as a flue gas denitration catalyst shows high denitration efficiency and wide temperature window; meanwhile, the catalyst has high stability, water resistance and sulfur poisoning resistance. In addition, the organic modified layered clay can effectively reduce alkali metal in the clay and improves the denitration performance of the catalyst. The clay used in the composite material has extensive sources, cheap price, low cost and environmental friendliness.

Description

technical field [0001] The invention relates to a preparation method of a denitration catalyst, in particular to a preparation method of a layered structure composite denitration catalyst. Background technique [0002] NOx is an important part of air pollution, and controlling the emission of nitrogen oxides has become an important part of air pollution control in my country and the world. Ammonia Selective Catalytic Reduction Technology (NH 3 -SCR) is currently the most effective and widely used denitrification technology. Among them, the core of SCR technology is the catalyst. Currently, commercial SCR catalysts use V 2 o 5 -WO 3 (MO 3 ) / TiO 2 catalyst. However, V in the vanadium-based denitration catalyst 2 o 5 It is a highly toxic substance and easily soluble in water, and its denitrification temperature window is narrow. At present, the country has designated it as a catalog of toxic and harmful raw materials (products) substitutes (2016 edition). Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01D53/86B01D53/56
CPCB01D53/8631B01D2251/2062B01J23/28
Inventor 刘优林徐波洋沈岳松祝社民
Owner NANJING UNIV OF TECH
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