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Method for molding catalyst applied to catalytic wet oxidation

A technology for catalyzing wet oxidation and molding methods, which is applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. Preparation procedures, catalyst activity decline and other problems, to achieve good industrial application prospects, good removal effect, and improve the effect of hydrothermal stability

Inactive Publication Date: 2019-09-20
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method not only uses precious metal raw materials, but also requires complex preparation procedures such as carrier-shaped catalysts and active component impregnation.
[0006] In addition, after the existing catalyst is molded, due to the difference in the type and amount of binder and various additives, the specific surface area, pore volume, and bulk density of the molded catalyst will be changed to a certain extent, resulting in a decline in catalyst activity. , affect the COD removal effect of shaped catalysts on wastewater

Method used

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  • Method for molding catalyst applied to catalytic wet oxidation
  • Method for molding catalyst applied to catalytic wet oxidation
  • Method for molding catalyst applied to catalytic wet oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: A molding method of catalytic wet oxidation catalyst, that is, a molding method of cryptomanganese ore (OMS-2) powder. The transition metal powder catalyst is ground and pulverized to 100-150 mesh cryptomanganese Potassium ore (OMS-2) powder, its weight is 0.8 kg;

[0050] The auxiliary binder is nano ZrO 2 Powder, the weight of which is 0.16 kg;

[0051] Described extruding aid is squash powder, and its weight is 0.016 kg;

[0052] Described pore structure modifier is citric acid, and its weight is 0.032 kg;

[0053] The binder is an aqueous solution of silica sol, and its dropping weight is 1.0 kg;

[0054] Mix the above materials with a mixer, add them into a kneader and knead for 20 minutes after mixing completely, add 30% binder silica sol aqueous solution dropwise while kneading, continue kneading for 20 minutes after the addition is completed, until the material becomes plastic state; The kneaded material was put into the extruder, the twin-screw s...

Embodiment 2

[0057] Example 2: A molding method of catalytic wet oxidation catalyst, that is, a molding method of cryptomanganese ore (OMS-2) powder. The transition metal powder catalyst is ground and pulverized to 100-150 mesh cryptomanganese Potassium ore (OMS-2) powder, its weight is 0.8 kg;

[0058] The auxiliary binder is nano ZrO 2 Powder, the weight of which is 0.24 kg;

[0059] Described extruding aid is squash powder, and its weight is 0.016 kg;

[0060] Described pore structure modifier is citric acid, and its weight is 0.032 kg;

[0061] The binder is an aqueous solution of silica sol, and its dropping weight is 1.2 kg;

[0062] Mix the above materials with a mixer, and then add them into the kneader and knead for 30 minutes, while kneading, add 30% of the binder silica sol aqueous solution dropwise, and continue kneading for 20 minutes after the addition is completed, until the materials are in a plastic state; The kneaded materials were put into the extruder, the twin-scre...

Embodiment 3

[0067] A method for forming a catalytic wet oxidation catalyst, an industrial MnO 2 Powder molding method, the transition metal powder catalyst is ground and pulverized to 100~150 mesh industrial MnO 2 Powder,

[0068] It is a material that is difficult to form. Its weight is 1.5 kg;

[0069] The auxiliary binder is nano TiO 2 Powder, the weight of which is 0.75 kg;

[0070] Described extruding aid is starch, and its weight is 0.075 kg;

[0071] Described pore structure modifier is oxalic acid, and its weight is 0.15 kg;

[0072] The binder is an aqueous solution of silica sol, and its dropping weight is 1.2 kg;

[0073] Mix the above materials with a mixer, and then add them into the kneader and knead for 30 minutes, while kneading, add 30% of the binder silica sol aqueous solution dropwise, and continue kneading for 20 minutes after the addition is completed, until the materials are in a plastic state; The kneaded materials were put into the extruder, the twin-screw s...

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Abstract

The invention provides a method for molding a catalyst applied to catalytic wet oxidation, belonging to the technical field of wastewater treatment. The method is applied to a powder catalyst which can be applied to various industrial reactors only after molding. The method is characterized in that the powder catalyst is a transition metal powder catalyst; and in the process of molding, auxiliary binders, a squeezing agent and a pore structure modifier are added at first, then a binder is dropwise added while mixing and kneading, and then extrusion molding, drying and roasting are performed. According to the invention, a silica sol is added as the binder and nanometer ZrO2 and nanometer TiO2 are added as the auxiliary binders, so the hydrothermal stability of the catalyst can be effectively improved while the requirement on mechanical strength during industrial application of the catalyst is met; and the catalyst has almost the same activity before and after molding, and produces good COD removal effect on wastewater.

Description

technical field [0001] The invention relates to a molding method of a catalytic wet oxidation catalyst, which belongs to the technical field of waste water treatment application. Background technique [0002] Catalytic wet oxidation (CWAO) is a common method for treating high-concentration, refractory organic wastewater, which uses air or O 2 As an oxidant, under the action of a catalyst, it can completely degrade organic matter into CO 2 and H 2 O, is a clean process route. Due to its moderate reaction energy consumption, small equipment footprint, short reaction time, and thorough pollutant treatment, it has attracted extensive attention from the industry in recent years. [0003] The key technology of catalytic wet oxidation method lies in the research of catalyst. The most commonly used wastewater treatment catalysts at home and abroad mainly include three categories: noble metal series (such as Ru, Pt, Pd, etc.), Cu series, and rare earth series (such as Mn, Ce, Fe,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/72C02F1/00C02F103/30
CPCB01J23/34B01J23/72B01J23/007C02F1/00C02F2103/30
Inventor 孙孟玲陈革新郑期中孟旭龚雨杰赵培庆
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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