A kind of preparation method of low temperature denitration catalyst supported by expanded graphite base carrier

An expanded graphite, carrier-supported technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical elements of heterogeneous catalysts, etc., can solve the problems of weak interaction, difficult to achieve efficient and stable loading, etc. , Excellent NOx removal efficiency, ensure the effect of water resistance

Active Publication Date: 2022-04-08
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above preparation process, the interaction between the active component and the expanded graphite is weak, and it is difficult to achieve high-efficiency and stable loading.

Method used

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  • A kind of preparation method of low temperature denitration catalyst supported by expanded graphite base carrier
  • A kind of preparation method of low temperature denitration catalyst supported by expanded graphite base carrier
  • A kind of preparation method of low temperature denitration catalyst supported by expanded graphite base carrier

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Embodiment 1

[0039] A preparation method of a low-temperature denitration catalyst loaded on an expanded graphite-based carrier, the process flow chart is as follows figure 1 shown, including the following steps:

[0040] A. Take an appropriate amount of 200-mesh expanded graphite in a crucible, and bake it at 450°C for 2 hours. The resulting expanded graphite structure is as follows: figure 2 The expanded graphite (EG) loose porous structure shown;

[0041] B, the expanded graphite processed in step A is added to the solution A containing tetrabutyl titanate, ethanol and glacial acetic acid in a volume ratio of 2:8:1 according to the ratio of 1:80.75 to tetrabutyl titanate mass ratio, Sonicate for 15 minutes and then stir for 30 minutes, then add solution C containing ethanol, water and dilute nitric acid (20% by mass) in a volume ratio of 1:1:0.01, which is equivalent to 2 times the volume of tetrabutyl titanate, into solution A , dried overnight at 120°C after standing for 18h and th...

Embodiment 2

[0046] A kind of preparation method of the low-temperature denitration catalyst supported by expanded graphite base carrier, comprises the following steps:

[0047] A. Take an appropriate amount of 200-mesh expanded graphite in a crucible, and bake it at 450°C for 2 hours;

[0048] B, the expanded graphite after processing is joined in the solution B that contains 1% sucrose (mass fraction) first ultrasonic 15min stirs 30min again, then the suspension solution D that is equivalent to solution B 2 times volumes containing titanium dioxide (expanded graphite and Titanium dioxide (mass ratio: 1:19) was added to Solution B, left to age for 18 hours, dried overnight at 120°C and calcined at 450°C for 5 hours to obtain an expanded graphite-based carrier.

[0049] C, manganese salt (manganese acetate), iron salt (ferric nitrate nonahydrate) are dissolved in methanol solution (methanol:water=1:1) according to the mass ratio of 1:1, form metal salt solution after stirring for 30min for...

Embodiment 3

[0053] A kind of preparation method of the low-temperature denitration catalyst supported by expanded graphite base carrier, comprises the following steps:

[0054] A. Take an appropriate amount of 200-mesh expanded graphite in a crucible, and bake it at 450°C for 2 hours;

[0055] B, the expanded graphite processed in step A is added to the solution A containing tetrabutyl titanate, ethanol and glacial acetic acid in a volume ratio of 2:8:1 according to the ratio of 1:420.75 to tetrabutyl titanate mass ratio, Sonicate for 15 minutes and then stir for 30 minutes, then add solution C containing ethanol, water and dilute nitric acid (20% by mass fraction) in a volume ratio of 1:1:0.01 equivalent to tetrabutyl titanate into solution A, After static aging for 12 hours, it was dried overnight at 120° C. and calcined at 450° C. for 4 hours to obtain an expanded graphite-based carrier.

[0056] C. Dissolve manganese salt (manganese nitrate tetrahydrate) and iron salt (ferric nitrate...

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Abstract

The invention discloses a preparation method of a low-temperature denitrification catalyst with high water resistance, and mainly relates to the technical field of environmental catalysis. The method comprises the following steps: A. pretreatment of the expanded graphite by roasting; B. combining the pretreated expanded graphite with titanium dioxide by using in-situ hydrolysis or introducing an external carbon source binder; C. combining the expanded graphite obtained in the previous step / titanium dioxide composite carrier is immersed in the transition metal salt solution for a period of time and then dried; D, roasting the dried sample to obtain the final product. The method is non-toxic and harmless, the process is simple, and the source of raw materials is extensive. The expanded graphite-based carrier can effectively improve the water resistance of the transition metal oxide catalyst. ‑1 Under certain conditions, the temperature range of 120°C-160°C has excellent NO for flue gas containing 10% water vapor x The removal efficiency can reach 50%‑80%, which has a high potential for industrial application.

Description

technical field [0001] The invention relates to the technical field of environmental catalysis, in particular to a method for preparing a low-temperature denitrification catalyst supported by an expanded graphite-based carrier, in particular to a method based on an expanded graphite-based carrier and a manganese-based composite oxide and applied to smoke with a relatively high water vapor content. A method for preparing a catalyst for low-temperature denitrification of gas. Background technique [0002] Nitrogen oxides (NOx) are emitted from stationary systems such as steel plants, municipal solid waste or mobile sources such as vehicles. x ) are major air pollutants that can cause photochemical smog and acid rain and pose health hazards. Selective Catalytic Reduction (SCR) was invented in Japan in 1970, and today, using NH 3 Selective Catalytic Reduction of NO x (NH 3 -SCR) has become the most commonly used NO due to its low cost and high efficiency. x emission reducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01J23/002B01J23/8892B01D53/8628B01J2523/00B01D2251/2062B01J2523/47B01J2523/72B01J2523/842
Inventor 陶善龙李咸伟张志翔石洪志上官文峰俞勇梅胡子国
Owner SHANGHAI JIAO TONG UNIV
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