Supported magnetic nano-palladium/gold catalyst and preparation method and application thereof

A magnetic nano and gold catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the cumbersome preparation process of catalysts and the toxicity of modifying reagents , Increase catalyst cost and other issues, achieve the effect of reducing preparation cost, avoiding secondary pollution, and easy operation

Active Publication Date: 2017-03-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method of immobilizing palladium nanoparticles has been widely studied in organic catalytic reactions, but it faces many problems as a catalyst for water treatment: the modifying reagent is often toxic, and will fall off into the water during the reaction, resulting in secondary Secondary pollution; in order to better fix palladium nanoparticles, a layer of porous oxide is usually coated on the surface of the catalyst, which makes the catalyst preparation process more cumbersome and further increases the cost of the catalyst

Method used

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  • Supported magnetic nano-palladium/gold catalyst and preparation method and application thereof
  • Supported magnetic nano-palladium/gold catalyst and preparation method and application thereof
  • Supported magnetic nano-palladium/gold catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Dissolve 2.77 grams of ferric chloride hexahydrate and 0.2 ethylenediaminetetraacetic acid disodium in 80 milliliters of ethylene glycol, stir for 30 minutes and then ultrasonically treat it for 1 hour, then place the resulting colloidal solution in a hydrothermal kettle at 200°C for reaction After 10 hours, the product obtained was washed three times with ethanol and water respectively, dispersed in 40 ml of 2 g / L sodium citrate solution, magnetically separated after ultrasonication for 30 minutes, washed twice with deionized water, and finally dispersed in 40 ml deionized water. The product of this step is monodisperse iron ferric oxide nanospheres, and the particle size distribution is between 180-220nm.

[0047] 0.6 g of Fe3O4 nanospheres were ultrasonically dispersed in a mixed solution of ethanol / deionized water (320 ml / 80 ml), and 40 ml of 25 wt % ammonia water was added. Then, 10 milliliters of tetraethyl orthosilicate was added dropwise under stirring conditio...

Embodiment 2

[0051] The difference from Example 1 is:

[0052] Take 0.8% iron ferric oxide / silica core-shell structure carrier and disperse it in 400 ml of deionized water, add 4 g of polyvinylpyrrolidone, and disperse evenly under ultrasonic conditions. Heat to 60 degrees, then add 2 ml of 25wt% ammonia solution, and keep warm for 30 minutes under agitation. After magnetic separation, washing and drying, a rough-surfaced triiron tetroxide / silicon oxide core-shell structure carrier is obtained. Its specific surface area can reach 160 square meters per gram.

[0053] In the supported catalyst obtained in this example, the palladium particles are uniformly distributed on the surface of the rough ferric oxide / silica core-shell structure carrier, the loading amount of palladium is 5wt%, and the palladium particle size is 7nm.

Embodiment 3

[0055] The difference from Example 1 is:

[0056] Take 0.8% iron ferric oxide / silica core-shell structure carrier and disperse it in 400 ml of deionized water, add 4 g of polyvinylpyrrolidone, and disperse evenly under ultrasonic conditions. Heat to 60 degrees, then add 2 ml of 25 wt% ammonia solution, and keep warm for 1 hour under stirring condition. After magnetic separation, washing and drying, a rough-surfaced triiron tetroxide / silicon oxide core-shell structure carrier is obtained. Its specific surface area can reach 200 square meters per gram.

[0057] In the supported catalyst obtained in this example, the palladium particles are evenly distributed on the surface of the rough ferric oxide / silicon oxide core-shell structure carrier, the loading amount of palladium is 5wt%, and the palladium particle size is 3nm.

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Abstract

The invention discloses a supported magnetic nano-palladium/gold catalyst and a preparation method and an application thereof, which belong to the field of a nano-material and an environment restoration material. The catalyst takes a ferriferrous oxide/silicon oxide core-shell structure as a carrier, the palladium/gold nano particles are supported on the surface; a surface etching method is used for processing the surface of the carrier, a ferriferrous oxide/silicon oxide carrier with the rough surface is constructed; then a homogeneous precipitation method is used for precipitating a palladium oxide which is a precursor of palladium on the surface of a silicon oxide shell layer, finally hydrogen is used for reduction, and crosslinking of polyvinylpyrrolidone is used for fixing the palladium nano particles on the silicon oxide shell layer. The catalyst has good monodispersion performance, the catalytic activity component palladium/gold can be distributed on the surface of the catalyst, so that the utilization is fully realized. The catalyst can be used for catalytic reduction of pollutants such as nitrite, azos dye and hexavalent chromium in water, has superparamagnetism, is easy to separat and reuse, and has high stability.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and environmental restoration materials, in particular to a supported magnetic nano-palladium / gold catalyst and its preparation method and application. The catalyst prepared by the method can very well catalyze the reduction of nitrite and azo in water. Pollutants such as dyes and hexavalent chromium. The catalyst has good recycling performance and excellent stability. Background technique [0002] As a very promising water treatment method, the catalytic reduction method has the advantages of fast reaction speed, the reaction can occur under normal temperature and pressure, and clean hydrogen is used as the reducing agent, which will not cause secondary pollution. Its main principle is to reduce pollutants to harmless substances (such as nitrite, azo dyes and hexavalent chromium, etc.) with reducing agents such as hydrogen under the action of catalysts. High cost has become one of the big...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C02F1/70C02F101/30C02F101/38C02F101/16C02F101/22
Inventor 李琦尚建库孙武珠杨炜沂
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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