Selective hydrogenation of cinnamaldehyde in supercritical CO 2 over Pt/SiO 2 and Pt/HS-CeO 2 : An insight about the role of carbonyl interaction with supercritical CO 2 or with ceria support sites in cinamyl alcohol selectivity

•The hydrogenation of cinnamaldehyde using H2 was performed under supercritical solvents.•Two high surface supports with different chemical properties were employed.•High selectivity to cinnamyl alcohol was related to a scCO2–carbonyl interaction.•The selectivity was independent of the solvent when ceria support was used.•Ce3+ sites could be responsible of the high selectivity to cinnamyl alcohol.