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Catalyst for wet oxidation technique and preparation method thereof

A wet oxidation and catalyst technology, applied in the field of metal materials, can solve the problem of high loading, and achieve the effects of low production cost, good dispersibility and cost reduction

Inactive Publication Date: 2008-05-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the cerium content (CeO 2 )20% load is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Commercial γ-Al 2 o 3 It is used as a carrier with a particle size of 3-5mm, washed, and dried at 110°C until constant weight is used as a catalyst carrier. Using nitrates of La, Ce and Mn as raw materials (the impregnation concentration is 1.0mol / L), the step-by-step impregnation method is adopted, and the impregnation time of each step is 20h. Afterwards, they were all placed in a muffle furnace and calcined at 400 °C for 3 hours to finally obtain MnO 2 -CeO 2 -La 2 o 3 / γ-Al 2 o 3 Catalysts, metals Mn, Ce, and La are loaded at 5wt%, 7wt%, and 5wt%, respectively.

[0023] Take 5g of prepared catalyst wet oxidation degradation phenol solution, solution COD is 11900mg / L, after reaction temperature is 150 ℃, reaction total pressure is 8MPa reaction is 1h, effluent phenol removal rate is 100%, solution COD is about 700mg / L L, the COD removal rate> 94%, showing good catalytic activity. The catalyst was reused three times, and its COD removal rate was still >91%, s...

Embodiment 2

[0025] Commercial γ-Al 2 o 3 It is used as a carrier with a particle size of 3-5mm, washed, and dried at 110°C until constant weight is used as a catalyst carrier. Use nitrates of La, Ce and Mn as raw materials (the concentration of each nitrate in the impregnated mixed solution is 0.8mol / L), mix and impregnate for 20h, dry at 120°C for 20h in the air atmosphere after impregnation, and then Placed in a muffle furnace and calcined at 300°C for 6h to obtain (MnO 2 -CeO 2 -La 2 o 3 ) / γ-Al 2 o 3 Catalysts, metals Mn, Ce, La loading are all 6wt%.

[0026] Take 5g of the prepared catalyst wet catalytic oxidation degradation phenol solution, the COD of the solution is 11900mg / L, after the reaction temperature is 150°C, the total reaction pressure is 8MPa and the reaction is 1h, the phenol removal rate is 100%, and the COD of the solution is about 1040mg / L , removal rate > 91%, showing good catalytic activity. The catalyst was reused three times, and its COD removal rate was ...

Embodiment 3

[0028] Commercial γ-Al 2 o 3 It is used as a carrier with a particle size of 3-5mm, washed, and dried at 110°C until constant weight is used as a catalyst carrier. The nitrates of La and Mn were used as raw materials (both impregnation concentrations were 0.5 mol / L), and continuous impregnation methods were adopted respectively, and each impregnation time was 12 hours. After impregnation, they were dried at 120°C for 20 hours in an air atmosphere, and then placed in a muffle furnace for 3 hours at 550°C to obtain MnO 2 -La 2 o 3 / γ-Al 2 o 3 Catalyst, metal Mn, La loading are 5wt%.

[0029] Take 5g of the prepared catalyst wet catalytic oxidation degradation phenol solution, the COD of the solution is 11900mg / L, after the reaction temperature is 150°C, the total reaction pressure is 8MPa and the reaction is 1.5h, the phenol removal rate is 100%, and the COD of the solution is about 910mg / L, COD removal rate > 92%, showing good catalytic activity. The catalyst was reuse...

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Abstract

The invention relates to a catalyst which is used for wet air oxidation technique and the preparation method in the field of environmental protection technology. The catalyst uses Gamma-Al2O3 as a vector and the oxide of transition metal Mn or Mn and rear earth element M or the oxide of the M as active components, wherein, M is one or two kinds in La and Ce and the loading of each metal relative to Gamma-Al2O3 vector is 5wt to 8wt percent. The catalyst takes Gamma-Al2O3 as the vector, is cleaned and roasted to be a consistent weight; the obtained Gamma-Al2O3 vector is immersed into the metallic salt solution of the rear earth element M and the transition metal Mn; the loading of each metal relative to the vector is 5wt to 8wt percent; the mixture after being immersed and dried is roasted in air to get the catalyst used in the wet air oxidation. The invention does not use expensive precious metal materials and greatly reduces the cost of the catalyst; at the same time, the catalytic activity of the catalyst is enhanced; the operation condition is improved; and the reaction time is shortened.

Description

technical field [0001] The invention relates to a catalyst in the technical field of metal materials and a preparation method thereof, in particular to a catalyst used in a wet oxidation process and a preparation method thereof. Background technique [0002] Catalytic wet oxidation technology is currently recognized as an effective oxidation technology for treating high-concentration, toxic, harmful, and refractory organic wastewater. It has received extensive attention due to its small equipment size, short reaction time, and less secondary pollution. Good application prospects. Catalysts with high activity and stability are one of the key technologies for the application of catalytic wet oxidation technology. Homogeneous catalysts have the advantages of high activity and fast reaction speed, but because the catalyst is soluble in water, subsequent treatment is required to avoid catalyst loss. Heterogeneous catalysts have the advantage of being easy to separate and recycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/10C02F1/72
Inventor 朱世云程鼎王军芳蔡伟民
Owner SHANGHAI JIAO TONG UNIV
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