In this work, a series of mesoporous yolk-shell silica spheres (YS-) with tunable yolk size and shell thickness were synthesized via the incubation method in water. Following amination and Pd loading treatment on YS-, a series of catalysts Pd-YS--NH were obtained successfully and applied to formic acid (FA) dehydrogenation for hydrogen (H) generation. The optimal catalyst Pd-YS-6-NH, which has an appropriate yolk size and shell thickness, the largest specific surface area, and pore volume, as well as the smallest Pd nanoparticles (NPs), exhibits dehydrogenation performance far superior to that of other reference catalysts.
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