Chemical Vapor Deposition of Al 13 Fe 4 Highly Selective Catalytic Films for the Semi-Hydrogenation of Acetylene

Ioannis G Aviziotis (1) , Thomas Duguet (1) , Khaled Soussi (2) , Marc Heggen (3) , Marie-Christine Lafont (1) , Franck Morfin (4) , Shashank Mishra (5, 2) , Stéphane Daniele (5, 2) , Andreas G Boudouvis (6) , Constantin Vahlas (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 CDURABLE - IRCELYON-C'Durable
3 Institut für Festkörperforschung
4 ING - IRCELYON-Ingéniérie, du matériau au réacteur
5 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon
6 NTUA - National Technical University of Athens [Athens]

Catalytic properties of coatings containing the Al 13 Fe 4 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 Al 13 Fe 4. 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 Al 13 Fe 4 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 Al 13 Fe 4 catalysts on 3D or porous supports.

Mots clés: m-Al13Fe4 phase; sequential deposition; chemical vapor deposition; catalysis; semi- hydrogenation of acetylene

Domaines: Matériaux; Catalyse; Environnement et Société

Ioannis G Aviziotis, Thomas Duguet, Khaled Soussi, Marc Heggen, Marie-Christine Lafont, et al.. Chemical Vapor Deposition of Al 13 Fe 4 Highly Selective Catalytic Films for the Semi-Hydrogenation of Acetylene. physica status solidi (a), 2017, 215 (2), pp.1700692. ⟨10.1002/pssa.201700692⟩. ⟨hal-02396275⟩