Carbon-based acid anhydride synergistic transition metal denitration catalyst and preparation method thereof

A denitration catalyst, transition metal technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of high cost, high catalytic reaction temperature, and easy poisoning of catalysts. Inactivation, etc.

Active Publication Date: 2017-04-26
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the selective catalysis of vanadium-based catalysts is widely used in industry, but its high cost and high catalytic reaction temperature also limit its application to a certain extent.
[0004] Transition metal oxide catalysts are currently the most widel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this embodiment, taking the treatment of nitrogen monoxide (NO) pollutant gas with a concentration of 990 ppm as an example, a method for removing NO pollutant gas by using graphene oxide in cooperation with a transition metal denitration catalyst, the steps are as follows:

[0030] a. Synthesize graphene oxide by Hummers method, freeze-dry the sample and grind and siev to 100 mesh

[0031] Save the following for use;

[0032] b. The first raw material is the graphene oxide synthesized in step a; the second raw material is transition metal nitrate

[0033] Acid salt

[0034] c. Impregnation process: Weigh FeCu:GO=1:1.5, Fe:Cu=5:1 molar ratio of iron nitrate and copper nitrate

[0035] And graphene oxide, dissolve the nitrate with deionized water ultrasonically, then add the graphene oxide to the solution, ultrasonic for 30min-1h, stand for 12h and then dry at 110℃ for 12h;

[0036] d. Grind the catalyst sample after drying in step c to a feed fineness of 100 mesh or less;

[0037...

Embodiment 2

[0046] In this embodiment, taking the treatment of nitric oxide (NO) pollutant gas with a concentration of 700 ppm as an example, a method for removing NO pollutant gas by using modified activated carbon in cooperation with a transition metal denitration catalyst, the steps are as follows:

[0047] a. Modification of activated carbon: Weigh 5g of powdered activated carbon and soak it in a 2mol / L nitric acid solution for 24h;

[0048] b. Centrifuge the mixed solution in step a and wash it with deionized water 5 times. Place the centrifuged sample in an oven at 110°C overnight and dry it. After drying, the sample is ground and sieved to below 100 mesh for use;

[0049] c. The first raw material used is the modified activated carbon synthesized in step b; the second raw material used is transition metal nitrate;

[0050] d. Impregnation process: Weigh FeCr:AC=1:1.5, Fe:Cr=5:1 molar ratio of ferric nitrate, chromium nitrate and modified activated carbon, dissolve ferric nitrate and chromiu...

Embodiment 3

[0056] In this embodiment, taking the treatment of nitric oxide (NO) pollutant gas with a concentration of 700 ppm as an example, a method for removing NO pollutant gas by using biochar in cooperation with a transition metal denitration catalyst, the steps are as follows:

[0057] a. Using corn stalks as raw materials, biochar is synthesized by hydrothermal method. The specific steps include:

[0058] b. Grind and sieve the corn stalks to below 100 mesh, then weigh 10g and place it in the reactor, add 50ml of deionized water, and purge with nitrogen for 10min. The reactor was placed in an oven at 240°C for 4 hours.

[0059] c. After the reactor in step b is cooled, the hydrothermal sample is washed 3 times with ethanol and deionized water, and finally dried in an oven at 105°C overnight. The dried sample is ground and sieved to below 100 meshes, ready for use;

[0060] d. The first raw material is the biochar synthesized in step c; the second raw material is transition metal nitrate...

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PUM

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Abstract

The invention discloses a carbon-based acid anhydride synergistic transition metal denitration catalyst and a preparation method thereof. A mixture which is obtained through impregnation process ultrasonic dissolving of a transition metal and acid anhydride carbon (including graphene oxide, activated carbon, carbon nanotubes and charcoal) is calcined at 300-500 DEG C in inert atmosphere for 2-4 h to obtain a composite structure. The prepared catalyst highly-efficiently catalyzes NOx pollution gases at medium and low temperatures, the catalysis mechanism of the catalyst is characterized in that the reducing agent of a reaction is carbon, loading of the transition metal introduces high-activity metal acid sites, and the metal can promote the decomposition of acid anhydride groups on the surface of carbon in order to release a lot of catalysis activity sites, so the continuous and highly-efficient proceeding of the catalysis reaction is facilitated. The catalyst realizes the combination of the acid anhydride carbon material and the transition metal, fully shows the respective advantages of the acid anhydride carbon material and the transition metal, and can highly-efficiently process the NOx pollution gas at medium and low temperatures.

Description

Technical field [0001] The invention relates to a denitration catalyst and a preparation method thereof, in particular to a method for treating pollutant gas by using the prepared catalyst, and particularly relates to a carbon-based acid anhydride synergistic transition metal denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxide NOx is one of the main air pollutants recognized by all countries in the world, which mainly includes NO, N 2 O, NO 2 , N 2 O 4 , N 2 O 5 And other compounds. Nitrogen oxides not only directly affect human health, but also cause photochemical smog, acid rain, greenhouse effect, ozone layer destruction and other ecological and environmental problems through a series of physical and chemical reactions. At present, the reduction of nitrogen oxides has received great attention. Since the “Twelfth Five-Year Plan” included nitrogen oxide emissions as a binding indicator system, as of the end of 2015, the total nitr...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J23/86B01J21/18B01J37/02B01J37/08B01J37/34B01J32/00B01D53/86B01D53/56
CPCY02C20/10B01J23/745B01D53/8628B01J21/18B01J23/862B01J37/0201B01J37/088B01J37/343
Inventor 张佳施雯沈森源王高荣高齐钱光人刘建勇
Owner SHANGHAI UNIV
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