Mono- and Bimetallic Ni−Co Catalysts in Dry Reforming of Methane
Zhang X. Vajglova Z. Mäki-Arvela P. Peurla M. Palonen H. Murzin D.Y. Tungatarova S.A. Baizhumanova T.S. Aubakirov Y.A.
15 April 2021John Wiley and Sons Inc
ChemistrySelect
2021#6Issue 143424 - 3434 pp.
Several bimetallic Ni−Co catalysts supported on θ-Al2O3 together with 10 wt % Ni and 10 wt % Co on θ-Al2O3 were prepared via the incipient wetness method, characterized by X-ray diffraction (XRD), nitrogen adsorption, transmission electron microscopy, temperature programmed reduction, temperature programmed CO2 desorption, Fourier Transformed Infrared Spectroscopy (FTIR) with pyridine adsorption-desorption and tested in dry methane reforming at 700 °C in a fixed bed reactor. According to XRD the metal oxide crystallite sizes decreased from 20 nm for 10 wt % Co/θ-Al2O3 to 13 nm for 5 wt % Ni-5 wt % Co/θ-Al2O3, which also showed formation of a mixed oxide alloy. The unit cell parameters for spinel in the fresh catalyst and fcc metal formed during the reaction followed the Vegards rule. Although monometallic 10 wt % Co/θ-Al2O3 exhibited high hydrogen consumption, desorption temperature was also high resulting in a rather low activity of 10 wt % Co/θ-Al2O3 in comparison to bimetallic 5 wt % Ni-5 wt % Co/θ-Al2O3. The latter exhibited the highest initial activity for hydrogen formation due to its relatively small metal particle size. This catalyst suffered, however, from extensive coking. The most stable catalyst was 10 wt % Ni/θ-Al2O3 for which the hydrogen yield decreased form 56 % to 45 % during 100 h time-on-stream. For this catalyst no sintering occurred, opposite to 10 wt % Co/θ-Al2O3.
alumina , cobalt , dry reforming , heterogeneous catalysis , methane , nickel , supported catalysts
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Al-Farabi Kazakh National University, 71 al-Farabi ave., Almaty, 050040, Kazakhstan
Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Turku/Åbo, 20500, Finland
Laboratory of Electron Microscopy, University of Turku, Turku, 20014, Finland
Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, Turku, 20500, Finland
D.V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry, 142 Kunaev str., Almaty, 050010, Kazakhstan
Al-Farabi Kazakh National University
Johan Gadolin Process Chemistry Centre
Laboratory of Electron Microscopy
Wihuri Physical Laboratory
D.V. Sokolsky Institute of Fuel
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