Enhanced NiO Dispersion on a High Surface Area Pillared Heterostructure Covered by Niobium Leads to Optimal Behaviour in the Oxidative Dehydrogenation of Ethane |
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Authors: | Prof. Enrique Rodríguez-Castellón Dr. Daniel Delgado Dr. Ana Dejoz Dr. Isabel Vázquez Dr. Said Agouram Dr. Juan A. Cecilia Dr. Benjamín Solsona Prof. José M. López Nieto |
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Affiliation: | 1. Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain;2. Instituto de Tecnología Química, Universitat Politècnica de València-Consejo, Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022 Valencia, Spain;3. Department of Chemical Engineering, Universitat de València, Av. Universitat s/n, 46100 Burjassot, Valencia, Spain;4. Department of Applied Physics and Electromagnetism, Universitat de València, C/Dr. Moliner 50, 46100 Burjassot, Valencia, Spain |
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Abstract: | A Nb-containing siliceous porous clay heterostructure (PCH) with Nb contents from 0 to 30 wt %) was prepared from a bentonite and used as support in the preparation of supported NiO catalysts with NiO loading from 15 to 80 wt %. Supports and NiO-containing catalysts were characterised by several physicochemical techniques and tested in the oxidative dehydrogenation (ODH) of ethane. The characterisation studies on Nb-containing supports showed the presence of well-anchored Nb5+ species without the formation of Nb2O5 crystals. High dispersion of nickel oxide with low crystallinity was observed for the Nb-containing PCH supports. In addition, when NiO is supported on these Nb-containing porous clays, it is more effective in the ODH of ethane (ethylene selectivity of ca. 90 %) than NiO supported on the corresponding Nb-free siliceous PCH or on Nb2O5 (ethylene selectivities of ca. 30 and 60 %, respectively). Factors such as the NiO–Nb5+ interaction, the NiO particle size and the properties of surface Nin+ species were shown to determine the catalytic performance. |
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Keywords: | dehydrogenation nickel niobium porous heterostructures supported catalysts |
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