Methane dry reforming over Ni catalysts supported on Ce–Zr oxides prepared by a route involving supercritical fluids

Marina Yu. Smirnova, Aleksei S. Bobin, Svetlana N. Pavlova, Arcady V. Ishchenko, Aleksandra V. Selivanova, Vasilii V. Kaichev, Svetlana V. Cherepanova, Tamara A. Krieger, Marina V. Arapova, Anne-Cecile Roger, Andrzej Adamski, Vladislav A. Sadykov
2017 Open Chemistry  
Ce 0.5 Zr 0.5 O 2 mixed oxides were prepared in a flow reactor in supercritical isopropanol with acetylacetone as a complexing agent. Variation of the nature of the Zr salt and the temperature of synthesis affected the phase composition, morphology and specific surface area of oxides. X-ray diffraction and Raman spectroscopy studies revealed formation of metastable t" and t' phases. Oxides are comprised of agglomerates with sizes depending on the synthesis parameters. Loading NiO decreases the
more » ... NiO decreases the specific surface area without affecting X-ray particle sizes of supports. Such sintering was the most pronounced for a support with the highest specific surface area, which resulted in the lowest surface content of Ni as estimated by X-ray photoelectron spectroscopy and in the formation of flattened NiO particles partially embedded into the support. The catalytic activity and stability of these samples in the dry reforming of methane were determined by the surface concentration of Ni and the morphology of its particle controlled by the metal-support interaction, which also depends on the type of catalyst pretreatment. Samples based on ceria-zirconia oxides prepared under these conditions provide a higher specific catalytic activity as compared with the traditional Pechini route, which makes them promising for the practical application. Abstract: In the concept of the aesthetic formation of knowledge and its as soon as possible and success-oriented application, insights and profits without the reference to the arguments developed around 1900. The main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique. Studies and Investigations The main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique.
doi:10.1515/chem-2017-0046 fatcat:ildvn3q76zepziacjeyq2brwja