In situ hydrodeoxygenation of vanillin over Ni-Co-P/HAP with formic acid as a hydrogen source

A new noble metal-free Ni-Co-P/HAP (hydroxyapatite) amorphous alloy catalyst was synthesized by an impregnation-chemical reduction method; the structure and properties of the catalysts were characterized by XRD, SEM, BET, XPS and DSC. Based on the model of the hydrodeoxygenation (HDO) of vanillin to 2-methoxy-4-methylphenol (MMP) with formic acid as a hydrogen source, the catalytic performance of the catalyst was studied. The results found that the Ni-Co-P/HAP catalyst exhibited excellent catalytic activity for the in situ HDO reaction of vanillin compared with Ni-P and Ni-Co-P. The conversion of vanillin could be high to 97.86% with MMP selectivity of 93.97% under optimized reaction conditions. In addition, mechanism studies have shown that the side reaction of carbocation and vanillyl alcohol (HMP) condensation can be effectively reduced with increasing the hydrogenation rate, thereby the selectivity of MMP was effectively increased.

Automated summary

The newly developed noble metal-free Ni-Co-P/HAP amorphous alloy catalyst exhibited excellent catalytic activity in the hydrogenation of vanillin, achieving a conversion rate of over 97.86% and a selectivity of 93.97% for MMP. It has the potential to be an efficient catalyst for the hydrodeoxygenation reaction.