Preparation method of carrying type lamellar bimetal composite oxide catalyst

A layered bimetallic and composite oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problem of loss of active components of ozone oxidation catalysts

Active Publication Date: 2015-12-30
POTEN ENVIRONMENT GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The embodiment of the invention discloses a preparation method of a supported layered bimetallic composite oxide catalyst, which is used to solve the problem of loss of active components of the ozone oxidation catalyst

Method used

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  • Preparation method of carrying type lamellar bimetal composite oxide catalyst
  • Preparation method of carrying type lamellar bimetal composite oxide catalyst
  • Preparation method of carrying type lamellar bimetal composite oxide catalyst

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Experimental program
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Effect test

Embodiment 1

[0041] Catalyst carrier pretreatment: select porous ceramic balls with a particle size of 3mm (specific surface area ≥ 240m 2 / g, compressive strength > 140N, bulk density > 0.17g / mL) as the catalyst carrier material, washed 3 times with clean water, then soaked in 0.1mol / L dilute nitric acid for 24h, and finally washed with clean water to the pH of the supernatant To be neutral, bake in an oven at 90°C for 24 hours for later use.

[0042] Preparation of the precursor of the supported layered bimetallic composite oxide catalyst: the preparation of 400ml concentration is the Mg(NO 3 ) 2 With a concentration of 0.1mol / L Fe(NO 3 ) 3 mixed salt solution, and another 400ml of NaOH with a concentration of 0.48mol / L and NaOH with a concentration of 0.2mol / L were prepared 2 CO 3 mixed solution. The two solutions were simultaneously poured into a fully back-mixed rotating liquid film reactor at a uniform speed and reacted for 2 minutes to prepare a mixed slurry containing a large...

Embodiment 2～ Embodiment 11

[0049] Embodiments 2-11 have the same method steps as Embodiment 1, except that the parameters of the experimental conditions and experimental materials are different, and the specific differences are shown in the table below.

[0050] Table 1 Catalyst carrier pretreatment

[0051]

[0052]

[0053] Embodiment 2 ~ embodiment 11 are consistent with embodiment 1, are all 400mL mixed salt solution and 400mLNaOH and NaOH 2 CO 3 Mix the solution, and at the same time, pour it into the fully back-mixed rotating liquid film reactor at a uniform speed for reaction.

[0054] Preparation of the precursor of the supported layered bimetallic composite oxide catalyst in table 2

[0055]

[0056]

[0057] Table 3 Catalytic Ozone Oxidation Experiment of Supported Layered Bimetallic Composite Oxide Catalyst

[0058]

[0059] It should be noted that COD Cr It refers to the chemical oxygen demand measured with potassium dichromate as the oxidizing agent. In practical applica...

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Abstract

The embodiment of the invention discloses a preparation method of a carrying type lamellar bimetal composite oxide catalyst. The preparation method comprises the steps of conducting pretreatment on a catalyst carrier; adding a divalent metal ion and trivalent metal ion mixed salt solution and a NaOH and Na<2>CO<3> mixed solution into an all-backmixing rotating liquid-film reactor simultaneously, conducting a reaction for 1-3 minutes, and obtaining mixed slurry containing lamellar bimetal composite hydroxide crystal nuclei; transferring the mixed slurry containing the lamellar bimetal composite hydroxide crystal nuclei and the catalyst carrier obtained after the pretreatment into a reaction kettle, conducting a reaction for 2-24 hours at the temperature of 60-150 DEG C, then conducting drying treatment, and obtaining a precursor of the carrying type lamellar bimetal composite oxide catalyst; conducting calcination on the precursor for 2-8 hours at the temperature of 250-500 DEG C, and obtaining the carrying type lamellar bimetal composite oxide catalyst. By means of the method, loss of active constituents in the catalyst is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a preparation method of a supported layered bimetallic composite oxide catalyst. Background technique [0002] Metal-catalyzed ozonation technology is a new type of method developed in recent years, which can oxidize those difficult-to-degrade organic substances under normal temperature and pressure. The key to metal-catalyzed ozonation technology is the catalytic performance of metal-catalyzed ozonation catalysts. The active components of metal-catalyzed ozonation catalysts are metals or metal oxides, and the loss of active components will inevitably reduce the catalytic performance of the catalyst. The metal-catalyzed ozone oxidation catalyst prepared by the existing method is prone to loss of active components, thereby reducing the catalytic performance of the catalyst for ozone and causing secondary pollution. Contents of the invention [0003] The embodiment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/755B01J23/22B01J29/46B01J29/072B01J29/06B01J23/72C02F1/78
Inventor 乔瑞平耿翠玉张伦梁蒋玮
Owner POTEN ENVIRONMENT GRP
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