Synthesis of highly efficient Nano- Ni-Pt catalyst in a rotating packed bed for cinnamaldehyde hydrogenation

Catalytic hydrogenation of alpha,beta-unsaturated aldehydes is an efficient way to provide chemical feedstocks. Herein, Ni-Pt nanoparticles (NPs) (0.051-0.126 wt% Pt) were first synthesized by liquid reduction without surfactant in a rotating packed bed to catalyze the hydrogenation of cinnamaldehyde (CAL). Catalyst characterizations show that despite the thin amount of Pt, the regional Ni-Pt alloy and uniform distribution of Pt on Ni NPs as well as the unambiguous defect sites were found on the prepared Ni-Pt NPs. These explain the good catalytic performance of CAL hydrogenation where CAL conversion of 97.1% with hydrocinnamaldehyde (HCAL) selectivity of 88.4% was obtained. The reaction rate obtained by Ni-Pt NPs (0.0768 mol center dot g(-1)center dot h(-1)) is 2.94 times larger than that by Ni NPs (0.0261 mol center dot g(-1)center dot h(-1)) while the selectivity is not affected. Additionally, we investigated different parameters on the effect of CAL hydrogenation. Further, the kinetic study on the hydrogenation of CAL was exposed. The preexponential factor and activation energy are 3.22 x 10(11) and 90.99 kJ/mol, respectively.