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A mosaic type pt@ceo 2 Preparation method of nanotube composite catalyst

A nanotube composite and catalyst technology is applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., to achieve the effect of improving thermal stability and simple preparation method

Inactive Publication Date: 2017-12-05
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Noble metal Pt nanoparticles embedded in CeO 2 The interior of hollow structural materials has not yet been reported

Method used

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  • A mosaic type pt@ceo <sub>2</sub> Preparation method of nanotube composite catalyst
  • A mosaic type pt@ceo <sub>2</sub> Preparation method of nanotube composite catalyst
  • A mosaic type pt@ceo <sub>2</sub> Preparation method of nanotube composite catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mosaic Pt@CeO 2 Preparation method of nanotube composite catalyst

[0028] Take 6.95 g Ce(NO 3 ) 3 ·6H 2 O and 5.77 g of urea were dissolved in 320 ml of deionized water, stirred for 10 min, then transferred to a three-neck flask, and kept in an oil bath at 80°C for 24 hours; cooled, washed with deionized water several times, and dried at 80°C to obtain rod-shaped Ce(OH)CO 3 Precursor.

[0029] Dissolve 3.6 g of NaOH in 30 ml of deionized water after vacuum deoxygenation, and then add 100 mg of the above-mentioned dried Ce(OH)CO 3 Stir the precursor, then evacuate, blow nitrogen to remove oxygen; under nitrogen atmosphere, add 1 ml prepared 0.02 mol / L H 2 PtCl 6 Solution, stirred at a slow speed (300rpm) for 1 day, and stood still for 2 days; centrifuged, washed with deionized water several times, and dried at 80°C;

[0030] Disperse the above dried sample in 10 ml deionized water, add 5 ml HNO 3 (1 mol / L), shake gently for 30-60 minutes, then centrifuge, wash ...

Embodiment 2

[0033] Mosaic Pt@CeO 2 Preparation method of nanotube composite catalyst: influence of stirring speed on final product morphology

[0034] Take 6.95 g Ce(NO 3 ) 3 ·6H2 O and 5.77 g of urea were dissolved in 320 ml of deionized water, stirred for 10 min, then transferred to a three-neck flask, and kept in an oil bath at 80°C for 24 hours; cooled, washed with deionized water several times, and dried at 80°C to obtain rod-shaped Ce(OH)CO 3 Precursor.

[0035] Dissolve 3.6 g of NaOH in 30 ml of deionized water after vacuum deoxygenation, and then add 100 mg of the above-mentioned dried Ce(OH)CO 3 Stir the precursor, then evacuate, blow nitrogen to remove oxygen; under nitrogen atmosphere, add 1 ml prepared 0.02 mol / L H 2 PtCl 6 Solution, stirred rapidly (900rpm) for 1 day, and stood still for 2 days; centrifuged, washed with deionized water several times, and dried at 80°C;

[0036] Disperse the above dried sample in 10 ml deionized water, add 5 ml HNO 3 (1 mol / L), shake g...

Embodiment 3

[0039] Mosaic Pt@CeO 2 Preparation method of nanotube composite catalyst: influence of reaction time on final product morphology

[0040] Take 6.95 g Ce(NO 3 ) 3 ·6H 2 O and 5.77 g of urea were dissolved in 320 ml of deionized water, stirred for 10 min, then transferred to a three-neck flask, and kept in an oil bath at 80°C for 24 hours; cooled, washed with deionized water several times, and dried at 80°C to obtain rod-shaped Ce(OH)CO 3 Precursor.

[0041] Dissolve 3.6 g of NaOH in 30 ml of deionized water after vacuum deoxygenation, and then add 100 mg of the above-mentioned dried Ce(OH)CO 3 Stir the precursor, then evacuate, blow nitrogen to remove oxygen; under nitrogen atmosphere, add 1 ml prepared 0.02 mol / L H 2 PtCl 6 Solution, stirred at a slow speed (300rpm) for 1 day, and stood still for 3 days; centrifuged, washed with deionized water several times, and dried at 80°C;

[0042] Disperse the above dried sample in 10 ml deionized water, add 5 ml HNO 3 (1 mol / L)...

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Abstract

The invention discloses a preparation method of an embedded Pt@CeO2 nanotube composite catalyst and belongs to the technical field of catalysts. The catalyst is formed by taking CeO2 hollow nanotubes as carriers and embedding Pt nanoparticles in tube walls in a highly dispersed manner. According to the preparation process, Ce(OH)CO3 precursors serve as sacrificial templates and are mixed with NaOH and H2PtCl6 solutions for reactions, Ce(OH)CO3@CeO2 is produced through a solid-liquid interface reaction, [Pt(OH)xCly]<m-> is adsorbed under the electrostatic effect, and the embedded Pt@CeO2 nanotube composite catalyst is prepared through pickling and H2 reduction finally. The method is simple, easy to implement, environment-friendly and clean, and the prepared embedded Pt@CeO2 nanotube composite catalyst has the excellent heat stability and shows superior CO oxidation catalysis performance.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a mosaic type Pt@CeO 2 Preparation method of nanotube composite catalyst. Background technique [0002] Noble metal Pt-based catalysts have attracted much attention in the catalyst industry because of their unique catalytic activity, selectivity and stability. Due to the scarcity and high price of noble metal resources, improving the utilization of noble metals has always been the core issue in the development of noble metal catalysts. Among them, nano-sized noble metal catalysts to increase their specific surface area and thus improve catalytic efficiency is an effective method to make full use of noble metals. However, the melting point of noble metal nanoparticles is low, and they are easy to sinter and affect the catalytic activity. For this reason, scientists usually combine noble metal nanoparticles with oxides, and use the latter as a carrier to "anchor" the nanoparti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63
CPCB01J23/63Y02A50/2351
Inventor 陈国柱王勇宋国隆
Owner UNIV OF JINAN
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