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High-selectivity manganese-based low-temperature denitration catalyst and preparation method thereof

A high-selectivity, low-temperature denitrification technology, applied in the field of high-selectivity manganese-based low-temperature denitrification catalyst and its preparation, can solve the problem of low selectivity, achieve good denitrification efficiency, solve the problem of low selectivity, and excellent N2 selectivity Effect

Active Publication Date: 2019-04-12
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the present invention provides a high-selectivity manganese-based low-temperature denitrification catalyst and its preparation method, which has more than 90% NO in the temperature range of 100-320 °C x Conversion rate, N 2 Selectivity greater than 95%, and has better anti-SO 2 Poisoning performance; the catalyst has excellent performance, simple preparation process, good erosion resistance by end surface hardening treatment, prolongs the service life of the catalyst, and the high-selectivity manganese-based low-temperature denitrification catalyst provided by the present invention solves the problem of the presence of manganese-based catalysts. N 2 low selectivity problem

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  • High-selectivity manganese-based low-temperature denitration catalyst and preparation method thereof

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Embodiment 1

[0032] A high-selectivity manganese-based low-temperature denitration catalyst, by weight percentage, including 3wt.% manganese oxide, 20wt.% zirconium oxide, 70wt.% titanium oxide, 5wt.% tungsten oxide substance, 1wt.% cerium oxide and 1 wt.% barium oxide.

[0033] The preparation method of the high-selectivity manganese-based low-temperature denitrification catalyst is as follows: first, a certain amount of manganese nitrate, zirconium nitrate, titanium sulfate and cerium nitrate are dissolved in water to obtain a mixed solution, and ammonia water is added to precipitate and filter to obtain a precipitate; After the acid is dissolved in water, stir evenly with the precipitate, dry and ball mill for 3 hours to obtain a powder, then add barium nitrate, forming aids and water, wherein the added amount of the forming aids is 10wt.% of the powder , the forming aid includes kapok pulp and glass fiber, 45wt.% of the forming aid is kapok pulp; the amount of water added is 75wt.% of ...

Embodiment 2

[0035] A high-selectivity manganese-based low-temperature denitration catalyst, by weight percentage, including 6wt.% manganese oxide, 22wt.% zirconium oxide, 66wt.% titanium oxide, 3wt.% tungsten oxide substance, 1.2wt.% cerium oxide material and 1.8wt.% barium oxide.

[0036]The preparation method of the high-selectivity manganese-based low-temperature denitrification catalyst is as follows: first, a certain amount of manganese sulfate, zirconium sulfate, titanyl sulfate and cerium acetate are dissolved in water to obtain a mixed solution, and ammonium carbonate is added to precipitate and filter to obtain a precipitate; Dissolve ammonium tungstate in water and stir evenly with the precipitate, dry at 50°C and ball mill for 3.5 hours to obtain powder, then add barium acetate, forming aids and water, wherein the amount of forming aids is 9wt.% of the powder, the forming aid includes kapok pulp and glass fiber, 47wt.% of the forming aid is kapok pulp; the addition of water is ...

Embodiment 3

[0038] A high-selectivity manganese-based low-temperature denitration catalyst, by weight percentage, including 9wt.% manganese oxide, 19wt.% zirconium oxide, 62wt.% titanium oxide, 6wt.% tungsten oxide substance, 1.4wt.% cerium oxide material and 2.6wt.% barium oxide.

[0039] The preparation method of the high-selectivity manganese-based low-temperature denitrification catalyst is as follows: first, a certain amount of manganese chloride, zirconium acetate, titanium sulfate and cerium sulfate are dissolved in water to obtain a mixed solution, and ammonia water is added to precipitate and filter to obtain a precipitate; Dissolve ammonium paratungstate in water and stir evenly with the precipitate, dry at 60°C and ball mill for 4 hours to obtain powder, then add barium nitrate, forming aid and water, wherein the amount of forming aid is 8wt of the powder %, the forming aid includes kapok pulp and glass fiber, 49wt.% of the forming aid is kapok pulp; the amount of water added i...

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Abstract

The invention discloses a high-selectivity low-temperature manganese-based denitration catalyst and a preparation method thereof. The high-selectivity manganese-based low-temperature denitration catalyst comprises an oxide of manganese, an oxide of zirconium, and an oxide of titanium, and further includes an oxide of tungsten, an oxide of cerium, and an oxide of barium. The preparation method comprises the steps of dissolving a manganese salt, a zirconium salt, a titanium salt and a cerium salt in water to obtain a mixed solution, adding a precipitating agent, and conducting precipitating andfiltering to obtain a precipitate; dissolving a tungsten compound in water to obtain a solution, adding the solution to the precipitate, conducting uniform stirring, conducting drying, and then conducting ball-milling to obtain a powder; and adding a barium salt, a forming aid and water to the powder, conducting stirring and ball-milling to obtain a slurry, and conducting extrusion molding, calcination, and end surface hardening, so as to obtain the catalyst. The catalyst provided by the invention has a NOx conversion rate of 90% or more in a temperature range of 100-320 DEG C, and a N2 selectivity of higher than 95%.

Description

technical field [0001] The invention belongs to the field of industrial flue gas denitrification, and in particular relates to a high-selectivity manganese-based low-temperature denitrification catalyst and a preparation method thereof. Background technique [0002] Selective catalytic reduction (SCR) technology is currently the most widely used and most effective NO x Emission control technology, the core of which is the SCR catalyst. At present, SCR technology mainly uses vanadium-tungsten-titanium catalysts, with a market share of about 97% (2015). The system catalyst has good denitrification performance and anti-SO 2 Poisoning performance, but its working temperature is in the middle and high temperature (300-450°C) range, which requires high ash arrangement in the hot section or low ash arrangement in the hot section. The higher concentration of dust and SO in the former flue gas 2 It has a serious erosion effect on the catalyst and shortens the service life of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J37/03B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/34B01J37/03B01J2523/00B01J2523/25B01J2523/3712B01J2523/47B01J2523/48B01J2523/69B01J2523/72
Inventor 张深根张柏林刘波
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD