Thermal stability of nanoporous Raney gold catalyst

dc.contributor.authorTai, Matthew C.
dc.contributor.authorGentle, Angus
dc.contributor.authorDe Silva, Kaludewa Sujeewa B.
dc.contributor.authorArnold, Matthew D.
dc.contributor.authorVan der Lingen, Elma
dc.contributor.authorCortie, Michael B.
dc.contributor.emailelma.vanderlingen@up.ac.zaen_ZA
dc.date.accessioned2015-08-24T05:22:54Z
dc.date.available2015-08-24T05:22:54Z
dc.date.issued2015-07
dc.description.abstractNanoporous “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 situ optical 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_ZA
dc.description.librarianhb2015en_ZA
dc.description.sponsorshipAustralian Research Council.en_ZA
dc.description.urihttp://www.mdpi.com/journal/metalsen_ZA
dc.identifier.citationTai, MC, Gentle, A, De Silva, KSB, Arnold, MD, Van der Lingen, E & Cortie, MB 2015, 'Thermal stability of nanoporous Raney gold catalyst', Metals (Open Access), vol. 5, no. 3, pp.1197-1211.en_ZA
dc.identifier.issn2075-4701 (online)
dc.identifier.other10.3390/met5031197
dc.identifier.urihttp://hdl.handle.net/2263/49448
dc.language.isoenen_ZA
dc.publisherMDPI Publishingen_ZA
dc.rights© 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).en_ZA
dc.subjectRaney golden_ZA
dc.subjectNanoporous golden_ZA
dc.subjectCatalysten_ZA
dc.subjectThermal stabilityen_ZA
dc.subjectMonte Carloen_ZA
dc.titleThermal stability of nanoporous Raney gold catalysten_ZA
dc.typeArticleen_ZA

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