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Multiphase wet oxidation catalyst and preparation method thereof

A wet oxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, catalyst carriers, etc., can solve the problems of lack of organic wastewater, lack of heterogeneous wet oxidation catalysts, etc.

Active Publication Date: 2011-07-20
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, there is a lack of a suitable heterogeneous wet oxidation catalyst in this area, and a catalyst suitable for treating high-concentration refractory organic wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] With a concentration of 5.2% by weight Ce(NO 3 ) 3 The ceramic-activated carbon spheres were impregnated with an equal volume of the solution. After the impregnation time was 24 hours, they were dried in an oven at 120°C for 10 hours, and then filled with 2.5% RuCl 3 The equal volume of the solution is impregnated, and the impregnation time is 24 hours. Dry the above-mentioned carrier in an oven at 120°C for 10 hours, reduce it with hydrogen at 500°C for 3 hours, passivate it in nitrogen containing 1% volume of oxygen for 8 hours after cooling to room temperature, and obtain a ceramic-activated carbon composite material as a carrier. Wet oxidation catalyst in which the precious metal Ru loading accounts for 2% by weight of activated carbon, and the auxiliary component Ce loading accounts for 3% by weight of activated carbon. Ceramic-activated carbon ball diameter 6mm, the content of activated carbon is 4.25%, the specific surface area of ​​activated carbon is 1350m 2...

Embodiment 2

[0068] With a concentration of 5.2% Ce(NO 3 ) 3 The equal volume of the solution was impregnated with ceramic-activated carbon spheres. After the impregnation time was 36 hours, it was dried in an oven at 100°C for 12 hours, and then heated with 2.43% H 2 PtCl 6 The equal volume of the solution is impregnated, and the impregnation time is 24 hours. Dry the above-mentioned carrier in an oven at 100°C for 12 hours, reduce it with hydrogen at 300°C for 8 hours, passivate it in nitrogen containing 1% volume of oxygen for 10 hours after cooling to room temperature, and obtain a ceramic-activated carbon ball. Oxidation catalyst, wherein the loading of noble metal Pt accounts for 4% of the weight of activated carbon, and the loading of auxiliary component Ce accounts for 5% of the weight of activated carbon. Used pottery-activated carbon ball is the same as embodiment 1.

[0069] Using this catalyst to wet oxidation treatment of resin industrial wastewater, under the conditions o...

Embodiment 3

[0071] With a concentration of 3.5% La(NO 3 ) 3 The equal volume of the solution was impregnated with ceramic-activated carbon spheres. After the impregnation time was 16 hours, it was dried in an oven at 140 ° C for 8 hours, and then the concentration was 2.15% (NH 4 ) 2 IrCl 6 The equal volume of the solution is impregnated, and the impregnation time is 24 hours. Dry the carrier in an oven at 140°C for 8 hours, reduce it with hydrogen at 400°C for 5 hours, passivate it in nitrogen containing 1% oxygen by volume for 8-12 hours after cooling to room temperature, and obtain a ceramic-activated carbon composite material It is a supported wet oxidation catalyst, wherein the loading of noble metal Ir accounts for 1% of the weight of activated carbon, and the loading of auxiliary component La accounts for 2% of the weight of activated carbon. Among them, the diameter of ceramic-activated carbon balls is 7mm, the content of activated carbon is 4.5%, and the specific surface area...

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Abstract

The invention provides a multiphase wet oxidation catalyst, in which noble metal elements, which are selected from one or more than one of the group consisting of platinum, ruthenium, rhodium, iridium and aurum, are taken as active components; and rare earth elements, which are selected from one or more than one of the group consisting of lanthanum, cerium, praseodymium and neodymium, are taken as auxiliary components; the active components and the auxiliary components are carried on a ceramic-activated carbon carrier, wherein the content of activated carbon accounts for 1 to 15% of the totalweight of the ceramic-activated carbon carrier, and the weight of elements in the active components and the auxiliary components accounts for 0.25 to 5% of the weight of the activated carbon respectively. The invention further provides a preparation method and uses thereof. The catalyst of the invention is particularly suitable for the treatment of high-concentration organic waste water which is hardly degraded.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a heterogeneous wet oxidation catalyst and a preparation method thereof. Background technique [0002] Among the technologies for treating high-concentration refractory organic wastewater, the more advanced one is wet catalytic oxidation technology (CWAO). This technology is to purify organic wastewater under certain temperature (125-320°C) and pressure (0.5-20Mpa) conditions by introducing air or oxygen in the presence of a catalyst, so that C, H, O, N to CO 2 、H 2 O and N 2 The form of discharge, and no secondary pollution. The core part of the technology is the catalyst. Most of the currently used catalysts are based on Al 2 o 3 、TiO 2 , ZrO 2 Or their composite oxides or porous metal materials such as high-nickel alloys are used as carriers, and one or more of iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungst...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/66B01J32/00B01J21/18C02F1/72C02F101/30C02F103/38
Inventor 刘卫民胡以强涂善东
Owner EAST CHINA UNIV OF SCI & TECH
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