Promotional effect of Co and Ni on MoO3 catalysts for hydrogenolysis of dibenzofuran to biphenyl under atmospheric hydrogen pressure

Document Type

Journal Article

Publication Date

2020

Keywords

Biphenyl, Co(Ni)/MoO 3, Dibenzofuran, Hydrogenolysis, Promotional effect

DOI

10.1016/j.jcat.2020.01.035

Abstract

© 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.

Source Publication

Journal of Catalysis

Volume Number

383

ISSN

00219517

First Page

311

Last Page

321

This document is currently not available here.

Link to Publisher’s Version

Share

COinS