Selective transformation of alcohols to corresponding aldehydes has a crucial significance under mild conditions in industrial manufacturing. Herein, a novel photothermal catalyst (Cr 2 O 3 -Al 2 O 3 )/ CdS (CAO/CdS) was successfully synthesized by coupling twodimensional Cr 2 O 3 -Al 2 O 3 (CAO) nanosheets and one-dimensional CdS nanorods. The CAO/CdS was characterized in detail. The synergistic effect of thermal catalyst CAO and photocatalyst CdS on the transformation of aromatic alcohols into aldehydes was verified. The result exhibited that alcohols could be oxidized into corresponding aldehydes efficiently under visible light illumination due to photocatalysis of CdS and thermal catalysis of CAO. CAO can weaken the bonds of O−H and C−Hα of alcohol at low temperatures, and CdS can produce active substances (•O 2 − and h + ) for oxidizing alcohols to aldehydes under visible light illumination. The benzaldehyde yield increased about three times. It is proposed that the work has significant theoretical and practical values in photocatalysis studies.
Chemoselectivity is a cornerstone of catalysis, permitting the targeted modification of specific functional groups within complex starting materials. Herein, we elucidate key structural and electronic factors in converting cinnamaldehyde to related hydrocinnamyl alcohol over Pt/graphite composites. Pt/graphite composites were prepared by a facile hydrothermal method, and performed excellent catalytic performance and selectivity in cinnamaldehyde conversion. When the ratio of Pt loading reaches 4%, cinnamaldehyde conversion is 97.3%, and the yield of hydrocinnamyl alcohol is 94.6%, with the selectivity high to 97.2%. Besides graphite, other support materials (BN, SiO2, TiO2, Al2O3, activated carbon, graphene and g‐C3N4), are also investigated to probe the reaction mechanism. This work indicates that the chemoselective hydrogenation of cinnamaldehyde over supported Pt catalyst can be flexibly controlled by tuning Pt loading amount and support materials.
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