Synthesis of gold encapsulated in spherical carbon capsules with a mesoporous shell structure. A robust catalyst in a nanoreactor

Isaac Nongwe; George Bepete; Ahmed Shaikjee; Vilas Ravat; Belina Terfassa; Reinout Meijboom; Neil J. Coville

doi:10.1016/j.catcom.2014.05.001

Synthesis of gold encapsulated in spherical carbon capsules with a mesoporous shell structure. A robust catalyst in a nanoreactor

Isaac Nongwe, George Bepete, Ahmed Shaikjee, Vilas Ravat, Belina Terfassa, Reinout Meijboom, Neil J. Coville

Chemical Sciences

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

Core-shell templates containing an encapsulated Au nanoparticle in a mesoporous silica (Au@mSiO₂) or nonporous silica (Au@SiO₂) shell structure were made. The silicas were then covered with carbon by CVD using toluene and the silica was removed using HF. Au@mHCS and Au@HCS were both characterized by PXRD, HRTEM, TGA, BET and ICP-OES. The Au@mHCS yolk-shell composite exhibited excellent catalytic activity and reusability (10 cycles) for the reduction of p-nitrophenol with conversion of up to 97% in 8 min. Heat treatment of Au@mHCS at 800 °C/4 h/N₂ did not alter the morphology or the catalytic activity significantly.

Original language	English
Pages (from-to)	77-82
Number of pages	6
Journal	Catalysis Communications
Volume	53
DOIs	https://doi.org/10.1016/j.catcom.2014.05.001
Publication status	Published - 5 Aug 2014

Keywords

Au thermal stability
Au@mHCS
CVD
Yolk-carbon shell nanostructures
p-Nitrophenol reduction

ASJC Scopus subject areas

Catalysis
General Chemistry
Process Chemistry and Technology

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10.1016/j.catcom.2014.05.001

Cite this

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title = "Synthesis of gold encapsulated in spherical carbon capsules with a mesoporous shell structure. A robust catalyst in a nanoreactor",

abstract = "Core-shell templates containing an encapsulated Au nanoparticle in a mesoporous silica (Au@mSiO2) or nonporous silica (Au@SiO2) shell structure were made. The silicas were then covered with carbon by CVD using toluene and the silica was removed using HF. Au@mHCS and Au@HCS were both characterized by PXRD, HRTEM, TGA, BET and ICP-OES. The Au@mHCS yolk-shell composite exhibited excellent catalytic activity and reusability (10 cycles) for the reduction of p-nitrophenol with conversion of up to 97% in 8 min. Heat treatment of Au@mHCS at 800 °C/4 h/N2 did not alter the morphology or the catalytic activity significantly.",

keywords = "Au thermal stability, Au@mHCS, CVD, Yolk-carbon shell nanostructures, p-Nitrophenol reduction",

author = "Isaac Nongwe and George Bepete and Ahmed Shaikjee and Vilas Ravat and Belina Terfassa and Reinout Meijboom and Coville, {Neil J.}",

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AU - Nongwe, Isaac

AU - Bepete, George

AU - Shaikjee, Ahmed

AU - Ravat, Vilas

AU - Terfassa, Belina

AU - Meijboom, Reinout

AU - Coville, Neil J.

PY - 2014/8/5

Y1 - 2014/8/5

N2 - Core-shell templates containing an encapsulated Au nanoparticle in a mesoporous silica (Au@mSiO2) or nonporous silica (Au@SiO2) shell structure were made. The silicas were then covered with carbon by CVD using toluene and the silica was removed using HF. Au@mHCS and Au@HCS were both characterized by PXRD, HRTEM, TGA, BET and ICP-OES. The Au@mHCS yolk-shell composite exhibited excellent catalytic activity and reusability (10 cycles) for the reduction of p-nitrophenol with conversion of up to 97% in 8 min. Heat treatment of Au@mHCS at 800 °C/4 h/N2 did not alter the morphology or the catalytic activity significantly.

AB - Core-shell templates containing an encapsulated Au nanoparticle in a mesoporous silica (Au@mSiO2) or nonporous silica (Au@SiO2) shell structure were made. The silicas were then covered with carbon by CVD using toluene and the silica was removed using HF. Au@mHCS and Au@HCS were both characterized by PXRD, HRTEM, TGA, BET and ICP-OES. The Au@mHCS yolk-shell composite exhibited excellent catalytic activity and reusability (10 cycles) for the reduction of p-nitrophenol with conversion of up to 97% in 8 min. Heat treatment of Au@mHCS at 800 °C/4 h/N2 did not alter the morphology or the catalytic activity significantly.

KW - Au thermal stability

KW - Au@mHCS

KW - CVD

KW - Yolk-carbon shell nanostructures

KW - p-Nitrophenol reduction

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JO - Catalysis Communications

JF - Catalysis Communications

ER -

Synthesis of gold encapsulated in spherical carbon capsules with a mesoporous shell structure. A robust catalyst in a nanoreactor

Abstract

Keywords

ASJC Scopus subject areas

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