Abstract
The development of chemical recyclable polyester based on hexahydrophthalide offers a solution to the plastic pollution issue. However, it remains a challenge to construct a promising catalyst route for monomers synthesis and clarifying the binary interactions between the support and active sites. In this work, we reported Pd/ZrO2 catalysts with different crystal structures by metal-support interaction and oxygen vacancy (Ov) regulation for the hydrodeoxygenation of hexahydrophthalic anhydride (HHPA) toward the continuous synthesis of hexahydrophthalide. The Pd/m-ZrO2 catalyst showed the highest conversion of HHPA (93.1 %) and the superior selectivity to hexahydrophthalide (96.1 %), a low apparent activation energy (Ea = 75 kJ/mol), and great stability under 200 °C, 3 MPa H2. Detailed experimental studies indicated that Pd/m-ZrO2 with the higher oxygen vacancy density, and the stronger interaction between the metal and the support, which results in the formation of more Pd-O-Zr structures with excellent catalytic performance. This work opens up a new pathway for the related acid anhydride hydrodeoxygenation reactions to recyclable lactones through catalytic engineering methods.
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