期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 42, 页码 9371-9381出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202000832
关键词
dehydrogenation; nickel; niobium; porous heterostructures; supported catalysts
资金
- Ministerio de Ciencia, Innovacion y Universidades of Spain [CRTl2018-099668-B-C21, RTl2018-099668-B-C22, MAT2017-84118-C2-1-R]
- MINECO [SVP-2014-068669]
- Severo Ochoa Excellence Program [SVP-2014-068669]
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 Nb2O5(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.
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