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

A denitrification catalyst and transition metal technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve high cost, easy poisoning and deactivation of catalyst, catalytic reaction Problems such as high temperature

Active Publication Date: 2019-07-23
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 widely studied NO-SCR catalysts. While they have the advantages of medium and high temperature catalysis, they also have some defects. 3 As a typical reducing agent, it will be accompanied by NH 3 Storage, transportation and unreacted NH 3 environmental problems, etc.

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) polluted gas with a concentration of 990ppm as an example, a method for removing NO polluted gas by using graphene oxide in cooperation with a transition metal denitrification catalyst, the steps are as follows:

[0030] a. Graphene oxide was synthesized by the Hummers method, and the sample was freeze-dried and then ground and sieved to 100 mesh

[0031] Save the following for later use;

[0032] B. adopt raw material one to be the graphene oxide that above-mentioned step a synthesizes; Adopt raw material two to be transition metal nitric acid

[0033] salt;

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

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

[0036] d. Grinding the catalyst ...

Embodiment 2

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

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

[0048] b. Centrifuge the mixed solution in step a, wash it with deionized water for 5 times, place the centrifuged sample in an oven at 110°C to dry overnight, grind and sieve the dried sample to below 100 mesh, and set aside;

[0049] c. adopt raw material one to be the modified active carbon after above-mentioned step b synthesis; Adopt raw material two to be transition metal nitrate;

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

Embodiment 3

[0056] In this embodiment, taking the treatment of nitrogen monoxide (NO) polluted gas with a concentration of 700ppm as an example, a method for removing NO polluted gas by using biochar in conjunction with a transition metal denitrification catalyst, the steps are as follows:

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

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

[0059] c. After the reactor in step b is cooled, wash the hydrothermally heated sample three times with ethanol and deionized water respectively, and finally dry it in an oven at 105°C overnight. Grind and sieve the dried samples to below 100 mesh, and set aside;

[0060] d. adopt raw material one to be the biochar that above-mentioned step c is synthes...

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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 denitrification catalyst and a preparation method thereof, in particular to a method for treating polluted gas by using the prepared catalyst, in particular to a carbon-based acid anhydride synergistic transition metal denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides NOx is one of the major air pollutants recognized around 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 ecological and environmental problems such as photochemical smog, acid rain, greenhouse effect, and ozone layer destruction through a series of physical and chemical reactions. At present, the emission reduction of nitrogen oxides has received great attention. Since the "Twelfth Five-Year Plan" included nitrogen oxide emissions in the binding indicator system, by the end of 2015, the tota...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J23/86B01J21/18B01J37/02B01J37/08B01J37/34B01J32/00B01D53/86B01D53/56
CPCY02C20/10
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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