Thermal stability of nanoporous raney gold catalyst

Tai, MC; Gentle, A; de Silva, KSB; Arnold, MD; van der Lingen, E; Cortie, MB

Thermal stability of nanoporous raney gold catalyst

Tai, MC

Gentle, A

de Silva, KSB

Arnold, MD

van der Lingen, E Cortie, MB

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Publication Type:: Journal Article
Citation:: Metals, 2015, 5 (3), pp. 1197 - 1211
Issue Date:: 2015-07-07

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Field	Value	Language
dc.contributor.author	Tai, MC https://orcid.org/0000-0002-3885-0743	en_US
dc.contributor.author	Gentle, A https://orcid.org/0000-0001-8964-0722	en_US
dc.contributor.author	de Silva, KSB https://orcid.org/0000-0002-3242-4858	en_US
dc.contributor.author	Arnold, MD https://orcid.org/0000-0003-4164-0242	en_US
dc.contributor.author	van der Lingen, E	en_US
dc.contributor.author	Cortie, MB https://orcid.org/0000-0003-3202-6398	en_US
dc.date.issued	2015-07-07	en_US
dc.identifier.citation	Metals, 2015, 5 (3), pp. 1197 - 1211	en_US
dc.identifier.uri	http://hdl.handle.net/10453/41210
dc.description.abstract	© 2015 by the authors; licensee MDPI, Basel, Switzerland. Nanoporous “Raney gold” sponge was prepared by de-alloying an Au-Al precursor alloy. Catalytic tests using a micro-reactor confirmed that Raney gold can serve as an active heterogeneous catalyst for CO oxidation, reduction of NO to N2, and oxidation of NO to NO2. In general, the specific surface area of a heterogeneous catalyst has an influence on its catalytic efficacy. Unfortunately, gold sponges coarsen readily, leading to sintering of their structure and reduction in surface area. This potentially places constraints on their upper operating temperature in catalytic reactors. Here we analyzed the behavior of Raney gold when the temperature was raised. We examined the kinetics and mechanism of coarsening of the sponge using a combination of in situoptical measurements and Metropolis Monte Carlo modeling with a Lennard-Jones interatomic potential. Modeling showed that the sponges started with an isotropic “foamy” morphology with negative average “mean curvature” but that subsequent thermally activated coarsening will drive the morphology through a bi-continuous fibrous state and on, eventually, to a sponge consisting of sintered blobs of predominantly positive “mean curvature”.	en_US
dc.relation.ispartof	Metals	en_US
dc.relation.isbasedon	10.3390/met5031197	en_US
dc.title	Thermal stability of nanoporous raney gold catalyst	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	5	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0914 Resources Engineering and Extractive Metallurgy	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	5	en_US

Abstract:

© 2015 by the authors; licensee MDPI, Basel, Switzerland. Nanoporous “Raney gold” sponge was prepared by de-alloying an Au-Al precursor alloy. Catalytic tests using a micro-reactor confirmed that Raney gold can serve as an active heterogeneous catalyst for CO oxidation, reduction of NO to N2, and oxidation of NO to NO2. In general, the specific surface area of a heterogeneous catalyst has an influence on its catalytic efficacy. Unfortunately, gold sponges coarsen readily, leading to sintering of their structure and reduction in surface area. This potentially places constraints on their upper operating temperature in catalytic reactors. Here we analyzed the behavior of Raney gold when the temperature was raised. We examined the kinetics and mechanism of coarsening of the sponge using a combination of in situoptical measurements and Metropolis Monte Carlo modeling with a Lennard-Jones interatomic potential. Modeling showed that the sponges started with an isotropic “foamy” morphology with negative average “mean curvature” but that subsequent thermally activated coarsening will drive the morphology through a bi-continuous fibrous state and on, eventually, to a sponge consisting of sintered blobs of predominantly positive “mean curvature”.

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http://hdl.handle.net/10453/41210