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One-step method for preparing flaky manganese dioxide/carbon fiber low-temperature denitration catalyst

A manganese dioxide, low-temperature denitration technology, applied in physical/chemical process catalysts, catalyst activation/preparation, chemical/physical processes, etc., to achieve the effects of excellent low-temperature activity and water resistance, beneficial to large-scale production, and simple operation

Inactive Publication Date: 2017-05-31
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the one-step preparation of nanosheet manganese dioxide / nanocarbon fiber low-temperature denitrification catalysts by liquid phase redox method, so it is very meaningful to carry out this related research

Method used

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  • One-step method for preparing flaky manganese dioxide/carbon fiber low-temperature denitration catalyst
  • One-step method for preparing flaky manganese dioxide/carbon fiber low-temperature denitration catalyst
  • One-step method for preparing flaky manganese dioxide/carbon fiber low-temperature denitration catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh the following raw materials in parts by weight: 0.2-0.4 parts of nano-carbon fiber, 0.1-1 part of potassium permanganate, 0.01-0.05 part of sodium bisulfate, 0.01-0.1 part of sodium dodecylbenzenesulfonate and 10-70 parts of deionized water share;

[0030] a) Add 0.3g of original carbon nanofibers and 0.0237g of sodium dodecylbenzenesulfonate to 50mL of deionized water and stir for 5min, then mix it with 25mL of 0.04mol / L sodium bisulfate aqueous solution and 25mL of 0.04mol / L high Potassium manganate aqueous solution is mixed, wherein the consumption of potassium permanganate is calculated according to the molar ratio of Mn7+ / C=4%, and the consumption of sodium bisulfate is consistent with potassium permanganate.

[0031] b) Place the uniformly mixed solution in an ultrasonic cleaner for ultrasonic reaction for 1 hour, while raising the reaction system to 65°C;

[0032] c) The catalyst obtained in step (b) is filtered, washed, and dried in a vacuum oven at 105°C...

Embodiment 2

[0036] a) Add 0.3g of original carbon nanofibers and 0.0237g of sodium dodecylbenzenesulfonate to 50mL of deionized water and stir for 5min, then mix it with 38mL of 0.04mol / L sodium bisulfate aqueous solution and 38mL of 0.04mol / L high Potassium manganate aqueous solution is mixed, wherein the consumption of potassium permanganate is calculated according to the molar ratio of Mn7+ / C=6%, and the consumption of sodium bisulfate is consistent with that of potassium permanganate.

[0037] b) Put the uniformly mixed solution in an ultrasonic cleaner for ultrasonic reaction for 1 hour, and raise the reaction system to 70°C at the same time;

[0038] c) The catalyst obtained in step (b) is filtered, washed, and dried in a vacuum oven at 105°C to obtain 6% MnO 2 / CNFs catalyst.

[0039] Denitrification efficiency test conditions: [NO]=[NH 3 ]= 400 ppm, [O 2 ]= 5%, N 2 As balance gas, the mass space velocity is 210000mL•g cat −1 • h −1 , 200mg catalyst;

[0040] The result is...

Embodiment 3

[0042] a) Add 0.3g of original carbon nanofibers and 0.0237g of sodium dodecylbenzenesulfonate to 50mL of deionized water and stir for 5min, then mix it with 50mL of 0.04mol / L sodium bisulfate aqueous solution and 50mL of 0.04mol / L high Potassium manganate aqueous solution is mixed, wherein the dosage of potassium permanganate is calculated according to the molar ratio of Mn7+ / C=8%, and the dosage of sodium bisulfate is consistent with that of potassium permanganate.

[0043] b) Put the uniformly mixed solution in an ultrasonic cleaner for ultrasonic reaction for 1 hour, and at the same time raise the reaction system to 75°C;

[0044] c) The catalyst obtained in step (b) is filtered, washed, and dried in a vacuum oven at 105°C to obtain 8% MnO 2 / CNFs catalyst.

[0045] Denitrification efficiency test conditions: [NO]=[NH 3 ]= 400 ppm, [O 2 ] = 5%, N 2 As balance gas, the mass space velocity is 210000mL•g cat −1 • h −1 , 200mg catalyst;

[0046] The result is 180 o T...

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Abstract

The invention discloses a one-step method for preparing a flaky manganese dioxide / carbon fiber low-temperature denitration catalyst, comprising the steps: mixing nanocarbon fiber, sodium dodecyl benzene sulfonate, sodium hydrogen sulfate and potassium permanganate; performing ultrasonic reaction and drying, thus obtaining the nano flaky manganese dioxide / nanocarbon fiber denitration catalyst. The nano flaky manganese dioxide uniformly grows on the surface of the nanocarbon fiber, so the catalyst is very excellent in low-temperature activity and water-resistant performance, and the rate of conversion can reach 98% or more at the temperature of 180 DEG C; the denitration performance of the catalyst is basically not affected after adding 5% H2O. The method disclosed by the invention is fast in preparation technology, simple in process and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a process for preparing a sheet-like manganese dioxide / carbon fiber low-temperature denitrification catalyst in one step. Background technique [0002] Nitrogen oxides (NO x ) as the main air pollutant, which can cause smog, photochemical smog, ozone depletion and a series of human health problems. Currently the most widely used and most mature technology for the treatment of industrial source NO x The technology is based on ammonia NH 3 Selective catalytic reduction (SCR) as a reducing agent. SCR technology removes NO x The core of the catalyst is the current commercial vanadium-titanium catalyst V 2 o 5 / TiO 2 In the middle temperature section (300~400 o C) The catalytic performance is superior. In this temperature range, the denitrification equipment is placed before the desulfurization and dust removal device, so the catalyst has high ash content and high...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/02B01J37/04B01J37/34B01D53/86B01D53/56
CPCB01D53/8628B01J23/34B01J37/04B01J37/343B01J35/00B01J35/30
Inventor 郑玉婴陈健
Owner FUZHOU UNIVERSITY
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