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Enhanced NiO Dispersion on a High Surface Area Pillared Heterostructure Covered by Niobium Leads to Optimal Behaviour in the Oxidative Dehydrogenation of Ethane
Author(s) -
RodríguezCastellón Enrique,
Delgado Daniel,
Dejoz Ana,
Vázquez Isabel,
Agouram Said,
Cecilia Juan A.,
Solsona Benjamín,
López Nieto José M.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202000832
Subject(s) - non blocking i/o , dehydrogenation , materials science , catalysis , niobium oxide , crystallinity , dispersion (optics) , nickel oxide , chemical engineering , selectivity , inorganic chemistry , ethylene , oxide , chemistry , organic chemistry , metallurgy , composite material , physics , optics , engineering
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 Nb 5+ species without the formation of Nb 2 O 5 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 Nb 2 O 5 (ethylene selectivities of ca. 30 and 60 %, respectively). Factors such as the NiO–Nb 5+ interaction, the NiO particle size and the properties of surface Ni n + species were shown to determine the catalytic performance.