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Preparation method of magnetic nanometer catalyst

A magnetic nano-catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of difficult catalyst recycling, achieve difficult recovery, mild preparation conditions, and improve catalytic performance Effect

Inactive Publication Date: 2017-08-04
NORTHWEST UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in photocatalytic decomposition of water to produce hydrogen and oxygen, photocatalytic degradation of organic dyes, catalytic oxidation of alcohols and gasoline desulfurization, and acid-catalyzed esterification reaction systems, polyacids as catalysts all show good catalytic performance, but catalyst recycling problem remains a puzzle

Method used

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  • Preparation method of magnetic nanometer catalyst
  • Preparation method of magnetic nanometer catalyst
  • Preparation method of magnetic nanometer catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Mesoporous TiO 2 coated magnetic Fe 3 o 4 Synthesis of microparticles

[0029] Reference [J. Mater. Chem. A, 2015, 3, 6492–6500] to prepare Fe 3 o 4 Magnetic particles: Ferric chloride (2.70 g), polyethylene glycol (3.00 g) and anhydrous sodium acetate (7.20 g) were dissolved in ethylene glycol (80 mL), heated and stirred until homogeneous, then transferred to polytetrafluoroethylene An ethylene-lined stainless steel autoclave (100 mL) was maintained at 200 °C for 8 h. A magnet collects the product after completion.

[0030] Fe 3 o 4 @mTiO 2 Magnetic core-shell preparation: Fe 3 o 4 (0.15g) was dispersed in ethanol (90ml), added ammonia water (0.4ml) to adjust to alkalinity, added ethanol solution of tetrabutyl titanate (0.75g dissolved in 10ml), stirred at 45°C for 24h, separated by magnet and Disperse in water (50ml), ultrasonicate at 20°C for 4 hours under reflux at a constant temperature, wash with ethanol after magnetic separation, and dry at r...

Embodiment 2

[0031] The electrochemical reduction of embodiment 2 phosphomolybdic acid

[0032] Phosphomolybdic acid H 3 PMo 12 o 40 Configured as a 10mM solution, put a DC power supply in the electrolytic cell, and electrolyze for 6h under the condition of (5V, 10mA), the polyacid solution gradually turns blue and is sealed and stored, recorded as r-H 3 PMo 12 o 40 .

Embodiment 3

[0033] Example 3 Loading of reduced polyacid on magnetic carrier

[0034] Take 0.1g Fe 3 o 4 @mTiO 2 Add 100ml r-H 3 PMo 12 o 40 , stirred at room temperature for 12 h, separated the obtained magnetic nanoparticles with a magnet, washed and dried. Such as figure 2 As shown, the characteristic peak of phosphomolybdic acid appeared on the curve (d), indicating that the polyacid was successfully loaded.

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Abstract

The invention provides a preparation method of a Pd (palladium)-loaded polyacid composite magnetic nanometer catalyst with high catalyzing activity and recycling effect. The preparation method comprises the following steps of using magnetic particles to coat mesoporous TiO2 (titanium dioxide), and aminating, so as to obtain a carrier; using an electrochemical method to reduce heteropolyacid, and loading onto the magnetic carrier; using reductive polyacid to reduce and deposit noble metal Pd nanoparticle in situ, so as to obtain the composite catalyst. The preparation method has the advantages that the preparation method is simple, and the catalytic reduction reaction activity is high; a magnet is directly used for attracting and separating, the multiple-time recycling effect is realized, and the technical problems of immobilizing, separating and recycling, and repeated utilization of the polyacid catalyst are effectively solved.

Description

technical field [0001] The invention relates to a method for preparing noble metal palladium nanoparticles deposited on a magnetic core-shell catalyst, in particular to the preparation of noble metal palladium nanoparticles by using reducing polyacid. Background technique [0002] Due to their special chemical activity and nano-performance, noble metal nanoparticles show chemical, optical, electrical, catalytic and magnetic properties different from those of bulk solids. Especially in the field of catalyst development, noble metal nanoparticles and their composite materials have received extensive attention. focus on. However, precious metal resources are limited, the synthesis conditions of noble metal nanoparticles are relatively harsh, and it is difficult to recycle noble metal nanoparticles as catalysts, resulting in relatively large catalyst loss. [0003] Heteropolyacids are a class of polymetallic oxo acid salt clusters with unique catalytic properties. However, most...

Claims

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Application Information

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IPC IPC(8): B01J27/19C02F1/00C02F101/38
CPCC02F1/00B01J27/19C02F2101/38B01J35/396B01J35/23B01J35/33
Inventor 薛岗林董新博武攀峰张溪
Owner NORTHWEST UNIV
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