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A kind of nano-rod-shaped manganese-chromium composite oxide low-temperature denitrification catalyst and its preparation method

A composite oxide and nanorod-shaped technology, applied in the field of flue gas denitrification, can solve the problems of complex preparation process, high denitration temperature, narrow activity window, etc., and achieve the effects of simple preparation process, high activity, and promotion of formation.

Active Publication Date: 2020-12-25
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the complex preparation process of existing denitrification catalysts, high denitrification temperature, simple MnO X Catalysts are susceptible to SO 2 Poisoning, narrow activity window and many other disadvantages

Method used

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  • A kind of nano-rod-shaped manganese-chromium composite oxide low-temperature denitrification catalyst and its preparation method
  • A kind of nano-rod-shaped manganese-chromium composite oxide low-temperature denitrification catalyst and its preparation method
  • A kind of nano-rod-shaped manganese-chromium composite oxide low-temperature denitrification catalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Dissolve 0.3 g of potassium permanganate and 0.25 g of chromium nitrate in 40 ml of deionized water, and ultrasonically disperse to obtain chromium nitrate solution and potassium permanganate solution.

[0024] (2) Mix the chromium nitrate solution and the potassium permanganate solution evenly, and magnetically stir for 2 hours at room temperature to obtain a mixed solution.

[0025] (3) Transfer the mixed liquid prepared in step (2) to a polytetrafluoroethylene hydrothermal kettle with a volume capacity of 100 ml, and react at 170° C. for 4 h.

[0026] (4) Suction filtration and washing of the solution in step (3), drying at 60°C, and calcining at 400°C for 3h in a muffle furnace to obtain a nanorod-shaped manganese-chromium composite oxide catalyst ((n-r)MnCrO X )(4h)).

[0027] figure 1 ((n-r)MnCrO prepared for Example 1 X ) XRD diagram. It can be seen from the figure that the nanorod-shaped manganese-chromium composite oxide mainly contains oxides of mangan...

Embodiment 2

[0030] (1) Dissolve 0.3 g of potassium permanganate and 0.25 g of chromium nitrate in 40 ml of deionized water, and disperse ultrasonically to obtain chromium nitrate solution and potassium permanganate solution.

[0031] (2) Mix the chromium nitrate solution and the potassium permanganate solution evenly, and magnetically stir for 2 hours at room temperature to obtain a mixed solution.

[0032] (3) Transfer the mixed solution prepared in step (2) to a polytetrafluoroethylene hydrothermal kettle with a volume capacity of 100 ml, and react at 170° C. for 2 h.

[0033] (4) Suction filtration and washing of the solution in step (3), drying at 80°C, and calcining for 3h at 400°C in a muffle furnace to obtain a nanorod-shaped manganese-chromium composite oxide catalyst (((n-r)MnCrO X )(2h)).

Embodiment 3

[0035] (1) Dissolve 0.3 g of potassium permanganate and 0.25 g of chromium nitrate in 40 ml of deionized water, and disperse ultrasonically to obtain chromium nitrate solution and potassium permanganate solution.

[0036] (2) Mix the chromium nitrate solution and the potassium permanganate solution evenly, and magnetically stir for 2 hours at room temperature to obtain a mixed solution.

[0037] (3) Transfer the mixed liquid prepared in step (2) to a polytetrafluoroethylene hydrothermal kettle with a volume capacity of 100 ml, and react at 170° C. for 6 h.

[0038] (4) Suction filtration and washing of the solution in step (3), drying at 100°C, and calcining for 3h at 400°C in a muffle furnace to obtain a nanorod-shaped manganese-chromium composite oxide catalyst (((n-r)MnCrO X )(6h)).

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Abstract

The invention belongs to the field of flue gas denitration, and particularly relates to a nano-rod shaped chromium-manganese composite oxide low-temperature denitration catalyst and a preparation method thereof. By using potassium permanganate and chromium nitrate as raw materials, the Mn-Cr composite oxide catalyst which has a stable structure, is compounded by manganese oxide and chromium oxideand has a novel rod-shaped structure is prepared through a hydrothermal synthesis method. A preparation process of the catalyst has the advantages that the preparation process is simple and economic,any templates are not needed, the catalyst is easily molded, the transmission electronic and ionic oxygen storage capability of the catalyst is enhanced, an active reaction temperature is effectivelyreduced, the heat stability of the catalyst is greatly improved, the service life of the catalyst is greatly prolonged, the denitration activity and the sulfur resistibility are improved, and an active window is wide.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification, and in particular relates to a low-temperature denitrification catalyst of nano-rod-shaped manganese-chromium composite oxide and a preparation method thereof. Background technique [0002] Currently, the treatment of NO emissions in the environment x (NO / N 2 O / NO 2 ), making it a non-toxic N 2 Change is very important. The reducing agents usually used in the SCR reaction mainly include ammonia (gaseous ammonia and urea), hydrocarbons and CO. Selective catalytic reduction (SCR) is the most widely used flue gas denitrification technology in the world today. Catalyst effect, reducing harmful nitrogen oxides to harmless nitrogen. [0003] V 2 o 5 / TiO 2 It is currently the most widely used SCR catalyst for flue gas denitrification in foreign industries, but the operating temperature of this type of catalyst must be higher than 350 ° C. Research and development of catalysts with low te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56B82Y40/00B01J37/10B01J35/02C01G45/02
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/34B01J35/02B01J37/10B82Y40/00C01G45/02C01P2002/72C01P2004/04C01P2004/16
Inventor 罗士平黄晓艳谢爱娟唐毅然姚超李霞章
Owner CHANGZHOU UNIV
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