Publication detail

Precursors of active Ni species in Ni/Al2O3 catalysts for oxidative dehydrogenation of ethane

Year: 2013

Type of publication: článek v odborném periodiku

Name of source: Chinese Journal of Catalysis

Publisher name: Science China Press

Place: Beijing

Page from-to: 1905-1913

Titles:

Language	Name	Abstract	Keywords
cze	Prekurzory aktivních Ni částic v Ni/Al2O3 katalyzátorů pro oxidativní dehydrogenaci etanu	Ni/Al2O3 katalyzátory pro oxidativní dehydrogenaci (ODH) etanu byly připraveny impregnací Al2O3 pomocí acetátu nebo nitrátu nikelnatého a mechanickým míšením NiO a Al2O3. Ni-katalyzátory byly charakterizovány pomocí N2 adsorpce-desorpce, rentgenové difrakce, DR-UV-VIS spektroskopie a teplotně programované redukce vodíkem.	nikl; alumina; etan; oxidativní dehydrogenace; částice niklu
eng	Precursors of active Ni species in Ni/Al2O3 catalysts for oxidative dehydrogenation of ethane	Ni/Al2O3 catalysts for oxidative dehydrogenation (ODH) of ethane were prepared by impregnation of Al2O3 with nickel acetate or nickel nitrate, and by mechanical mixing of NiO and Al2O3. The Ni-based catalysts were characterized by N-2 adsorption-desorption, X-ray diffraction, diffuse reflectance UV-visible diffuse reflectance spectroscopy, and temperature-programmed reduction of hydrogen. The results showed that formation of crystalline NiO particles with a size of < 8 nm and/or non-stoichiometric NiO species in the Ni/Al2O3 catalysts led to more active species in ODH of ethane under the investigated reaction conditions. In contrast, tetrahedral Ni species present in the catalysts led to higher selectivity for ethene. Formation of large crystalline NiO particles (22-32 nm) over Ni/Al2O3 catalysts decreased the selectivity for ethene.	nickel; alumina; ethane; oxidative dehydrogenation; nickel species

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