In-Situ Incorporation of Pt Nanoparticles on Layered Double Hydroxides for Selective Conversion of Cinnamaldehyde to Cinnamyl Alcohol

Designing efficient and low-cost catalysts for generation of cinnamyl alcohol (CMO) from cinnamaldehyde (CMA) hydrogenation is of practical value. Herein, layered double hydroxide supported Pt nanoparticles (Pt-s/LDH) were prepared by in-situ reduction of PtCl62- in PtCl62--LDH with ethylene glycol, and the PtCl62- was intercalated in LDH by ion-exchange method. The characterization results verify that small Pt nanoparticles are uniformly distributed on LDH with average diameter of 1.9 nm and narrow size distribution. The prepared Pt-s/LDH catalyst exhibits excellent catalytic performance for selective hydrogenation of CMA under relatively mild reaction conditions (80 degrees C, 2 MPa H-2) with high turnover frequency (TOF) (0.574 s(-1)) and CMA conversion (92.6 %). Furthermore, the CMA conversion rate and CMO selectivity remain almost unchanged after the fourth run compared with the results of the first run. This study provides an effective route for synthesis of efficient and stable LDH-supported metal catalysts.