Deoxydehydration of Biomass‐Derived Polyols Over Silver‐Modified Ceria‐Supported Rhenium Catalyst with Molecular Hydrogen
Kosuke Yamaguchi, Ji Cao, Mii Betchaku, Yoshinao Nakagawa, Masazumi Tamura, Akira Nakayama, Mizuho Yabushita, Keiichi Tomishige
Abstract
Abstract Olefin production from polyols via deoxydehydration (DODH) was carried out over Ag‐modified CeO 2 ‐supported heterogeneous Re catalysts with H 2 as a reducing agent. Both high DODH activity and low hydrogenation ability for C=C bonds were observed in the reaction of erythritol, giving a 1,3‐butadiene yield of up to 90 % under “solvent‐free” conditions. This catalyst is applicable to other substrates such as methyl glycosides (methyl α‐fucopyranoside: 91 % yield of DODH product; methyl β‐ribofuranoside: 88 % yield), which were difficult to be converted to the DODH products over the DODH catalysts reported previously. ReO x ‐Ag/CeO 2 was reused 3 times without a decrease of activity or selectivity after calcination as regeneration. Although the transmission electron microscopy energy‐dispersive X‐ray spectroscopy and X‐ray absorption fine structure analyses showed that Re species were highly dispersed and Ag was present as metal particles with various sizes from well‐dispersed species (<1 nm) to around 5 nm particles, the catalysts prepared from size‐controlled Ag nanoparticles showed similar performance, indicating that the catalytic performance is insensitive to the Ag particle size.