(AGENPARL) – LONDON (UNITED KINGDOM), ven 18 settembre 2020
In this study, palladium nanoparticles supported on bulk and nanosheet-like graphitic carbon nitride (Pd/b-CN and Pd/ns-CN) were prepared and studied for the catalytic transfer hydrogenation (CTH) of furfuryl alcohol (FOL) into tetrahydrofurfuryl alcohol (THFOL) with formic acid (HCOOH) as a hydrogen donor. Sorption experiments show that Pd/ns-CN possesses a higher specific surface area, more surface basic sites, and a higher Pd dispersion as compared to Pd/b-CN. Electronic and optical characterizations suggest that Pd nanoparticles are primarily deposited on the surface sites associated with pyridinic nitrogen atoms, forming interfacial Mott-Schottky heterojunction that enables the electron transfer from CN support to Pd nanoparticles. Catalytic testing indicates that as compared to Pd/b-CN, Pd/ns-CN displays a higher turnover frequency (TOF) for THFOL production. According to the experimental observations, we have proposed a catalysis mechanism, in which surface basic sites in abundance and Pd nanoparticles enriched with electrons are believed to be crucial to activate HCOOH (through the cleavages O-H and C-H bonds) to transfer hydrogen to C=C bonds in the furan ring of FOL to yield THFOL.
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