Chemical Vapor Deposition of Al13Fe4 Highly Selective Catalytic Films for the Semi‐Hydrogenation of Acetylene. Issue 2 (7th December 2017)

• Record Type: Journal Article
• Authors: Aviziotis, Ioannis G.; Duguet, Thomas; Soussi, Khaled; Heggen, Marc; Lafont, Marie‐Christine; Morfin, Franck; Mishra, Shashank; Daniele, Stephane; Boudouvis, Andreas G.; Vahlas, Constantin
• Is Part Of: Physica status solidi. Volume 215:Issue 2(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-12-07
• Subjects: acetylene -- Al13Fe4 -- catalysis -- chemical vapor deposition -- hydrogenation -- intermetallic phases; Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201700692
• Languages: English
• ISSNs: 1862-6300

Abstract

Abstract : Catalytic properties of coatings containing the Al13 Fe4 intermetallic phase are tested in the reaction of semi‐hydrogenation of acetylene. The selectivity to ethylene is found as high as 74% close to the reported values for pure, unsupported Al13 Fe4 . The initial conversion of acetylene to ethylene is 84% and rapidly drops due to the catalytic formation of carbon‐based by‐products on secondary Al‐Fe phases. Coatings are processed through sequential chemical vapor deposition (CVD) of aluminum (5 Torr, 180 °C) and iron (40 Torr, 140 °C) layers, followed by in situ annealing for 60 min at 575 °C. Deposition proceeds at high growth rate, resulting in 15 μm thick films. After annealing, coatings are composed of the Al13 Fe4 phase, co‐existing with minor secondary Al‐Fe intermetallic phases. Overall, it is shown that films containing complex Al‐Fe intermetallic phases can be processed by CVD, opening new routes to the engineering of pure, supported Al13 Fe4 catalysts on 3D or porous supports. Abstract : Films containing the noble metals‐free, monoclinic Al13 Fe4 phase are produced by chemical vapor deposition. The selectivity of the catalytic semi‐hydrogenation of ethylene performs on them is as high as 74% close to the reported values for pure, unsupported Al13 Fe4 . New routes are open, to the engineering of pure, supported Al13 Fe4 catalysts on 3D or porous supports.