(Table ). Using ethanol as the solvent, the control experiment indicated that the aldehyde could selectively be reduced hydrogenation or hydrodeoxygenation at room temperature in different time sections (Table , entry 1-2). Besides, the time-dependent transformation image also clearly shows that the aldehyde is first hydrogenated and reduced to the alcohol, and then is further hydrodeoxygenated to the corresponding product (Figure ). These results demonstrated that Pd@MOF catalyzed aldehyde hydrodeoxygenation was a stepwise reaction as shown in Scheme 1.