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Sulfur-resistant and water-resistant manganese low-temperature denitration catalyst and preparation method thereof

A low-temperature denitration and catalyst technology, which is used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can reduce the production cost, enhance the ability of sulfur and water resistance, and enhance the sulfur resistance.

Inactive Publication Date: 2020-09-15
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it is known that many manganese-based low-temperature denitrification catalysts are produced and formulated, mainly by extrusion molding, and due to the low decomposition temperature of manganese nitrate, it is impossible to obtain products with stable quality, and the cost is high, and the low-temperature sulfur resistance is poor. , leading to the impossibility of industrial production and practical application promotion

Method used

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  • Sulfur-resistant and water-resistant manganese low-temperature denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 A manganese-based low-temperature denitration catalyst with high sulfur and water resistance and low cost, and the preparation method is as follows:

[0029] (1) According to m TiO2 / V NaOH (g / ml)=0.005 added to 8mol / L sodium hydroxide solution and stirred for 30min, then placed in a hydrothermal reaction kettle at 150℃ for airtight reaction for 24h, after cooling, washed with 0.05mol / L HCl, and washed with deionized water until neutral . After drying at 60°C for 10 hours, a titanium dioxide nanotube precursor was obtained.

[0030] (2) Add 5 parts of molybdenum disulfide, 3 parts of 30% wt silica sol, 1 part of propylhydroxymethyl cellulose, 3 parts of glass fiber, and 2 parts of aluminum dihydrogen phosphate to 85 parts of titanium dioxide nanotube precursor. It is mixed with 120 parts of deionized water, stale, honeycomb extrusion molding, dried at 60°C for 48h, and calcined at 300°C for 24h to obtain a titanium dioxide nanotube honeycomb carrier.

[0031] (3) ...

Embodiment 2

[0032] Example 2 A manganese-based low-temperature denitration catalyst with high sulfur and water resistance and low cost, the preparation method is as follows:

[0033] (1) According to m TiO2 / V KOH (g / ml)=0.01 added to 12mol / L potassium hydroxide solution and stirred for 60min, then placed in a hydrothermal reaction kettle at 220℃ for 12h airtight reaction, after cooling, use 0.1mol / LH 2 SO 4 Wash, wash with deionized water to neutral. After drying at 100°C for 8 hours, a titanium dioxide nanotube precursor was obtained.

[0034] (2) Add 10 parts of tungsten disulfide, 5 parts of 30% wt silica sol, 3 parts of propylhydroxymethyl cellulose, 5 parts of glass fiber, and 8 parts of aluminum dihydrogen phosphate to 75 parts of titanium dioxide nanotube precursor. It is mixed with 150 parts of deionized water, stale, honeycomb extrusion molding, dried at 80°C for 24 hours, and calcined at 500°C for 12 hours to obtain a titanium dioxide nanotube honeycomb carrier.

[0035] (3) Prepar...

Embodiment 3

[0036] Example 3 A manganese-based low-temperature denitrification catalyst with high sulfur and water resistance and low cost, the preparation method is as follows:

[0037] (1) According to m TiO2 / V NaOH (g / ml)=0.008 was added to 10mol / L sodium hydroxide solution and stirred for 60min, then placed in a hydrothermal reaction kettle at 210℃ for airtight reaction for 24h, after cooling, use 0.05mol / LHNO 3 Wash, wash with deionized water to neutral. After drying at 90°C for 10 hours, a titanium dioxide nanotube precursor was obtained.

[0038] (2) Add 3 parts of molybdenum disulfide, 3 parts of tungsten disulfide, 4 parts of 30%wt silica sol, 3 parts of propylhydroxymethyl cellulose, 5 parts of glass fiber to 80 parts of titanium dioxide nanotube precursor. Mixing 6 parts of aluminum dihydrogen phosphate and 135 parts of deionized water, aging, honeycomb extrusion molding, drying at 70°C for 36 hours, and calcining at 400°C for 18 hours to obtain a titanium dioxide nanotube honeyco...

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Abstract

The invention discloses a sulfur-resistant and water-resistant manganese low-temperature denitration catalyst and a preparation method thereof, and relates to the technical field of catalyst preparation. The catalyst comprises a sulfur-resistant auxiliary agent, an active component and a hydrophobic substance, and a carrier of the catalyst is a titanium dioxide nanotube synthesized by using a waste SCR catalyst as a raw material through a hydrothermal method. A titanium dioxide nanotube precursor is prepared from the waste SCR low-temperature denitration catalyst through a closed hydrothermalreaction, and is used as a raw material for preparing the honeycomb low-temperature denitration catalyst, and the prepared manganese-based low-temperature denitration catalyst with high sulfur resistance, water resistance and low cost has the following advantages: the production cost is greatly reduced, the sulfur resistance and water resistance are enhanced, and the denitration efficiency is obviously higher than that of the low-temperature denitration catalyst applied in the industry at present. The resource saving is easily achieved, the resource reutilization is improved, the problems of low specific surface area and small pore volume of the existing titanium dioxide are solved, and the industrial application and promotion of the manganese-based low-temperature denitration catalyst areachieved.

Description

Technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a low-temperature manganese denitration catalyst with high sulfur resistance, water resistance and low cost, and a preparation method. Background technique [0002] Selective catalytic reduction (SCR) is the most widely used technology for removing nitrogen oxides from flue gas. NH 3 As a reducing agent, it uses a catalytic reaction to reduce harmful nitrogen oxides to harmless nitrogen. As the national environmental protection policy requirements become more and more stringent, the nitrogen oxide emission requirements of the glass, cement, coking, chemical, steel, carbon black and other industries are gradually decreasing, but the flue gas temperature range is widely lower, below 300 ℃, SO 2 And the high water vapor content and harsh working conditions restrict the use of traditional medium, high temperature and low temperature denitration catalysts. When the flue gas t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/34B01J27/051B01J35/04B01J35/10B01J37/02B01D53/86B01D53/56
CPCB01J37/0207B01J23/34B01J21/063B01J27/051B01D53/8628B01J35/56B01J35/615B01J35/635B01J35/633Y02C20/30
Inventor 张涛刘安阳张深根张柏林孙超邓立锋罗春云陈嘉俊
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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