Performance, Structure, and Mechanism of ReOx-Pd/CeO2 Catalyst for Simultaneous Removal of Vicinal OH Groups with H-2

Ota, N; Tamura, M; Nakagawa, Y; Okumura, K; Tomishige, K

HERO ID

4684016

Reference Type

Journal Article

Year

2016

HERO ID 4684016
In Press No
Year 2016
Title Performance, Structure, and Mechanism of ReOx-Pd/CeO2 Catalyst for Simultaneous Removal of Vicinal OH Groups with H-2
Authors Ota, N; Tamura, M; Nakagawa, Y; Okumura, K; Tomishige, K
Volume 6
Issue 5
Page Numbers 3213-3226
Abstract The ceria-supported rhenium catalyst modified with palladium (ReOx-Pd/CeO2 (Re = 2 wt %, Pd/Re = 0.25)) is still the best catalyst for simultaneous hydrodeoxygenation. Higher Re loading amount decreased the activity. The simultaneous hydrodeoxygenation of cyclic vicinal diols occurs with high cis-stereoselectivity. ReOx-Pd/CeO2 catalysts were characterized by means of XRD, TEM, H-2-TPR, XAFS, XPS, Raman, and DFT calculations. The Re species on ReOx-Pd/CeO2 (Re = 2 wt %, Pd/Re = 0.25) catalyst after reduction and after stoichiometric reaction of 1,2-hexanediol to 1-hexene were Re-IV and Re-VI, and the Re-IV species were converted to Re-VI through the stoichiometric reaction. The Re species on ReOx-Pd/CeO2 are proposed to be randomly located on the CeO2 surface, and probably only monomeric Re species have catalytic activity for simultaneous hydrodeoxygenation. This model can explain the higher activity of Re = 2 wt % catalyst than those of higher Re loading catalysts. The reaction is proposed to proceed by the tetra/hexavalent redox cycle of the Re center in the catalysis followed by hydrogenation.
Doi 10.1021/acscatal.6b00491
Wosid WOS:000375894500059
Is Certified Translation No
Dupe Override No
Comments Journal:ACS CATALYSIS 2155-5435
Is Public Yes
Keyword heterogeneous catalysis; rhenium oxide; palladium; hydrodeoxygenation; deoxydehydration