(732f) Adsorption and Reaction of Furfuryl Alcohol on Pt(111): A Comparison Study to Pd(111)
In designing effective and efficient catalysts for HDO, both Pt and Pd must be considered due to their ability to activate H2, which is necessary in HDO. However, little is known if Pt and Pd catalyze the reaction of these oxygenates in the same way. Our recent temperature programmed desorption (TPD) studies show that on Pt(111), furfuryl alcohol undergoes decarbonylation to furan, propylene, carbon monoxide, and hydrogen, as well as undergoes hydrodeoxgyenation to produce methylfuran and water. Furfuryl alcohol also undergoes an unexpected ring decomposition and reformation to produce benzene, which is likely formed via coupling of C3 surface intermediates. Decarbonylation on Pt(111) occurs through two reaction pathways, surface hydrogen assisted decarbonylation and interadsorbate hydrogen assisted decarbonylation, whereas on Pd(111) furan incorporates only surface hydrogens. Conversely, deoxgyenation of furfuryl alcohol only occurs via a surface hydrogen assisted CâO bond breakage on Pt(111) while Pd(111) catalyzes the CâO bond through both the incorporation of surface hydrogrens and through an interadsorbate hydrogen exchange. The high-resolution electron energy loss spectroscopy (HREELS) studies revealed that furfuryl alcohol bound to the Pt(111) surface through the functional alcohol group, which facilitated increased CâO bond scission, at high surface coverages. These surface science results provide useful mechanistic insights for the reaction of furfuryl alcohol on Pt(111) and how it compares to Pd(111).