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We have examined the role of support oxygen vacancies in the gas phase hydrogenation of furfural over Au/TiO 2 and Au/CeO 2 prepared by deposition-precipitation. Both catalysts exhibited a similar Au particle size distribution (1-6 nm) and mean (2.8-3.2 nm). Excess H 2 consumption during TPR is indicative of partial support reduction, which was confirmed by O 2 titration. Gold on CeO 2 with a higher redox potential exhibited a greater oxygen vacancy density. A lower furfural turnover frequency ( TOF ) was recorded over Au/CeO 2 than Au/TiO 2 and is linked to suppressed H 2 chemisorption capacity and strong -C=O interaction at oxygen vacancies that inhibited activity. Gold on non-reducible Al 2 O 3 as benchmark exhibited greater H 2 uptake and delivered the highest furfural TOF . Full selectivity to the target furfuryl alcohol was achieved over Au/TiO 2 and Au/Al 2 O 3 at 413 K and over Au/CeO 2 at 473 K with hydrogenolysis to 2-methylfuran at higher reaction temperature (523 K). A surface reaction mechanism is proposed to account for the activity/selectivity response.

Role of Support Oxygen Vacancies in the Gas Phase Hydrogenation of Furfural over Gold