Abstract
This work shows the performance of MoOx–VOx based bimetallic catalysts tested on the oxidative desulfurization (ODS) process of refractory dibenzothiophenic compounds using H2O2 as an oxidant. The catalytic activity was related with the oxidation state of molybdenum and vanadium surface species and with the interaction of both metals. The prepared molybdenum–vanadium oxides supported on alumina were subjected to reduction treatments at different temperature to obtain molybdenum and vanadium species with different oxidation state. Catalysts were characterized by their textural properties, scanning electron microscopy–energy dispersive X-ray, X-ray diffraction, temperature programed reduction and X-ray photoelectron spectroscopy. The characterization results showed that metal interactions promote the generation of highly active tetrahedral molybdenum species and isolated vanadium species, which increase the ODS performance of Mo–V based catalysts compared with their respective monometallic catalysts. Also, it was observed that combination of Mo6+, Mo4+ and V4+ superficial species promoted the ODS catalytic activity.
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Acknowledgements
This study was financial supported by the Project Support Program for Research and Technological Innovation (PAPIIT) of UNAM (Projects IN115514 and IN115317) and IMP Project D.0047. Marco Antonio Alvarez-Amparán acknowledge the PhD National Scholarship (Scholarship Number 245610) to National Council of Science and Technology of Mexico (CONACyT). We thank C. Salcedo (XRD) and I. Puente (SEM–EDX) for the technical assistance.
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Alvarez-Amparán, M.A., Cedeño-Caero, L., Cortes-Jácome, M.A. et al. Relationship between the catalytic activity and Mo–V surface species in bimetallic catalysts for the oxidative desulfurization of dibenzothiophenic compounds. Reac Kinet Mech Cat 122, 869–885 (2017). https://doi.org/10.1007/s11144-017-1237-4
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DOI: https://doi.org/10.1007/s11144-017-1237-4