Promotional effect of Co and Ni on MoO3 catalysts for hydrogenolysis of dibenzofuran to biphenyl under atmospheric hydrogen pressure
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Biphenyl, Co(Ni)/MoO 3, Dibenzofuran, Hydrogenolysis, Promotional effect
© 2020 Elsevier Inc. Co(Ni)/MoO3 catalysts were prepared, characterized and evaluated for the hydrogenolysis of bio-derived dibenzofuran (DBF), aiming at the understanding of the promoting effect of Co/Ni on MoO3 for high-yield production of aromatic products. All Co(Ni)/MoO3 catalysts selectively cleaved C-O bond, thus effectively transformed DBF to biphenyl (BP) at relatively moderate conditions. The experimental results from varying Mo species by adjusting the reduction temperature of MoO3 together with XPS and in-situ XRD characteristic were evident that Mo5+ species was responsible as the major active specie for the reaction. Promotional effect between Co(Ni) and Mo in Co(Ni)/MoO3 catalysts was observed, resulted from the presence of acidic Co(Ni)MoO4 species and a large number of Mo5+ species both of which were created local to the Co(Ni)-O-Mo interface, as can be characterized by in-situ XRD, XPS, H2-TPR, NH3-TPD, in-situ FT-IR, Raman and TEM. The trend of the initial reaction rate follows: MoO3 (0.18 μmol∙gcat−1∙s−1) < Ni/MoO3 (0.26 μmol∙gcat−1∙s−1) < Co/MoO3 (0.29 μmol∙gcat−1∙s−1), corresponding to the decreasing activation barrier. And the best catalytic activity was observed for the 100% yield of BP over Co/MoO3. A possible mechanism, including Co(Ni) facilitated reduction of Mo6+ to Mo5+ and Co(Ni) enhanced formation of acidic sites, is proposed to be responsible for the high activity in Co(Ni)/MoO3 catalysts.
Journal of Catalysis
Zhang, J.,Li, C.,Guan, W.,Chen, X.,Chen, X.,Tsang, C.,& Liang, C. (2020). Promotional effect of Co and Ni on MoO3 catalysts for hydrogenolysis of dibenzofuran to biphenyl under atmospheric hydrogen pressure. Journal of Catalysis, 383, 311-321. http://dx.doi.org/10.1016/j.jcat.2020.01.035