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Layered double hydroxide derived NiAl-oxide hollow nanospheres for selective transfer hydrogenation with improved stability

Selective transfer hydrogenation (STH) is an efficient strategy in biomass upgradation, especially for the production of unsaturated alcohols from biomass-derived α,β-unsaturated aldehydes. Design of effective catalysts with excellent stability for the STH is highly desired. Here, we report the synthesis of Ni3Al1-oxide hollow nanospheres (h-Ni3Al1-800) derived from Ni3Al1 layered double hydroxide grafted on hollow polymer spheres (HPS@Ni3Al1-LDH) by calcination at 800 °C in air. h-Ni3Al1-800 is an efficient catalyst for the STH of α,β-unsaturated aldehydes with selectivities towards α,β-unsaturated alcohols >99% at almost full conversions. More importantly, h-Ni3Al1-800 can be recycled at least 12 times without loss of activity. Experimental results and DFT calculations prove that the Al dopant in h-Ni3Al1-800 provides much stable Niδ+-type (2 < δ < 3) acid–base pairs which can efficiently catalyze the STH with improved stability. This work provides a promising direction for the design of STH catalysts that have potential for industrial applications.