caa a22 4500 606173609 CHVBK 20210128100734.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11244-015-0451-4 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0451-4 The Role of Ni Species Distribution on the Effect of Ce as a Promoter in C2-ODH Reaction [Elektronische Daten] [Lucie Smoláková, Martin Kout, Libor Čapek] The aim of work was to analyse and discuss the effect of cerium on the catalytic behaviour of different types of nickel species in the oxidative dehydrogenation of ethane. Ni-Al and Ni-Ce-Al catalysts were prepared from cerium nitrate and nickel nitrate or nickel acetate as a precursor. As-prepared materials were characterized by using of XRD, DR UV-Vis spectroscopy and H2-TPR. It was found that the addition of cerium affects both the reducibility of nickel species and the population of nickel species. Firstly, the addition of cerium led to the significant decrease of the reduction peak at 755-785°C to about 40°C due to the Ni-Ce interaction at both Ni-Ce-Al-NO3 and Ni-Ce-Al-ac catalysts. Secondly, the addition of cerium affected the relative population of nickel species in tetrahedral and octahedral coordination, which population originated from used nickel precursor. The presence of cerium in Ni-Ce-Al-NO3 catalysts led to the decrease in the relative population of Ni(T d ) species, while the crystal size of NiO in Ni-Ce-Al-ac catalysts decreased with increasing Ce/Ni ratio. The highest ethylene productivity was achieved on catalysts with Ce/Ni molar ratio 0.13. Catalysts exhibited an ethylene productivity up to 1.0 gC2=·g cat −1 ·h−1 with a selectivity of 82% (Ni-Ce-Al-NO3) and 1.3 gC2=·g cat −1 ·h−1 with a selectivity of 75% (Ni-Ce-Al-ac). Springer Science+Business Media New York, 2015 Oxidative dehydrogenation nationallicence Ethane nationallicence Cerium nationallicence Promoter nationallicence Smoláková Lucie Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic aut Kout Martin Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic aut Čapek Libor Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 843-853 1022-5528 58:14-17<843 2015 58 11244 https://doi.org/10.1007/s11244-015-0451-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0451-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Smoláková Lucie Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic aut NATIONALLICENCE 700 1- Kout Martin Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic aut NATIONALLICENCE 700 1- Čapek Libor Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 843-853 1022-5528 58:14-17<843 2015 58 11244