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Size controlled copper nanoparticles hosted in mesoporous silica matrix: Preparation and characterization

Paper ID Volume ID Publish Year Pages File Format Full-Text
46540 46441 2012 11 PDF Available
Title
Size controlled copper nanoparticles hosted in mesoporous silica matrix: Preparation and characterization
Abstract

A novel preparation strategy was performed to obtain uniform and size controlled, in a large scale, copper nanoparticles, hosted into mesoporous silica matrix. The method includes the initial deposition of finely dispersed copper nanoparticles, using a conventional incipient wetness impregnation of silica matrix with small amount of nitrate precursor and consecutive pretreatment in oxidation and reduction atmosphere. The further controlled growing of the loaded copper particles was performed in rotary bed reactor by step-wise deposition of copper over them by OMCVD techniques, using bis- (hexafluoroacetylacetonate) copper (II) hydrate as a precursor. A complex of physicochemical methods (TEM, Nitrogen physisorption, TPR and TPRD-MS measurements, UV-Vis and FTIR spectroscopy of adsorbed CO) was used for characterization of the samples. The catalytic properties of the obtained materials were investigated in methanol decomposition to CO and hydrogen. A mechanism of the copper particles growing was discussed. Size dependent effects of the redox and catalytic properties of the loaded copper particles which are strongly affected by their location in the silica porous structure are assumed.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ Novel method for synthesis of supported copper nanoparticles with tailored size. ▸ Size dependent effects of the redox and catalytic properties. ▸ Catalysts formation by the influence of reaction medium. ▸ Size dependent effects are controlled by the support porous structure.

Keywords
OMCVD technique; Copper nanoparticles supported on mesoporous silica; Methanol decomposition; Size dependent effects; FTIR spectroscopy
First Page Preview
Size controlled copper nanoparticles hosted in mesoporous silica matrix: Preparation and characterization
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 126, 25 September 2012, Pages 161–171
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis