The effect of WO3 modification of ZrO2 support on the Ni-catalyzed dry reforming of biogas reaction for syngas productionThe effect of WO3 modification of ZrO2 support on the Ni-catalyzed dry reforming of biogas reaction for syngas production Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2018-03-222017enThe time-on-stream catalytic performance and stability of 8 wt. % Ni catalyst supported on two commercially available catalytic supports, ZrO2 and 15 wt.% WO3-ZrO2, was investigated under the biogas dry reforming reaction for syngas production, at 750°C and a biogas quality equal to CH4/CO2 = 1.5, that represents a common concentration of real biogas. A number of analytical techniques such as N2 adsorption/desorption (BET method), XRD, H2-TPR, NH3- and CO2-TPD, SEM, ICP, thermal analysis (TGA/DTG) and Raman spectroscopy were used in order to determine textural, structural and other physicochemical properties of the catalytic materials, and the type of carbon deposited on the catalytic surface of spent samples. These techniques were used in an attempt to understand better the effects of WO3-induced modifications on the catalyst morphology, physicochemical properties and catalytic performance. Although Ni dispersion and reducibility characteristics were found superior on the modified Ni/WZr sample than that on Ni/Zr, its dry reforming of methane (DRM) performance was inferior a result attributed to the enhanced acidity and complete loss of the basicity recorded on this catalyst, an effect that competes and finally overshadows the benefits of the other superior properties. Raman studies revealed that the degree of graphitization decreases with the insertion of WO3 in the crystalline structure of the ZrO2 support, as the ID/IG peak intensity ratio is 1.03 for the Ni/Zr and 1.29 for the Ni/WZr catalyst.http://creativecommons.org/licenses/by/4.0/Frontiers in Environmental Science5Oct Χαρισίου Νικόλαος Δ. Charisiou Nikolaos D. Σιακαβέλας Γιώργος Siakavelas Giorgos Παπαγερίδης Κυριάκος Ν. Papageridis Kiriakos N. Μπακλαβαρίδης Απόστολος Ν. Baklavaridis Apostolos N. Tzounis, Lazaros 1987- Γούλα Γραμματική Goula Grammatiki Gentekakis Ioannis Γεντεκακης Ιωαννης Πολυχρονοπούλου Κυριακή Polychronopoulou Kyriaki Goula, Maria Frontiers Media Biogas utilization Cyclic economy Dry reforming of methane Renewable carbon sources Syngas production Tungstated zirconia Zirconia