Preprint Article Version 1 This version is not peer-reviewed

Acid-Base Bifunctional Hf Nanohybrids-Enabled High Selectivity in Catalytic Conversion of Ethyl Levulinate to γ-Valerolactone

Version 1 : Received: 26 May 2018 / Approved: 28 May 2018 / Online: 28 May 2018 (12:27:29 CEST)

How to cite: Wu, W.; Li, Y.; Li, H.; Zhao, W.; Yang, S. Acid-Base Bifunctional Hf Nanohybrids-Enabled High Selectivity in Catalytic Conversion of Ethyl Levulinate to γ-Valerolactone. Preprints 2018, 2018050402 (doi: 10.20944/preprints201805.0402.v1). Wu, W.; Li, Y.; Li, H.; Zhao, W.; Yang, S. Acid-Base Bifunctional Hf Nanohybrids-Enabled High Selectivity in Catalytic Conversion of Ethyl Levulinate to γ-Valerolactone. Preprints 2018, 2018050402 (doi: 10.20944/preprints201805.0402.v1).

Abstract

Catalytic upgrading of bio-based platform molecules is one of promising approaches for biomass valorization. However, most solid catalysts are thermally and/or chemically unstable and difficult to prepare. In this study, a stable organic phosphonate-hafnium solid catalyst (PPOA-Hf) was synthesized, and acid-base bifunctional sites were found to play a cooperative role in the cascade transfer hydrogenation and cyclization of ethyl levulinate (EL) to γ-valerolactone (GVL). Under relatively mild reaction conditions of 160 ºC for 6 h, EL was completely converted to GVL in a good yield of 85%. The apparent activation energy was calculated to be 53 kJ/mol, which was lower than other solid catalysts for the same reaction. In addition, the PPOA-Hf solid catalyst did not significantly decrease its activity after five recycles, and no evident leaching of Hf was observed, indicating its high stability and potential practical application.

Subject Areas

heterogeneous catalysis; transfer hydrogenation; biomass conversion; biofuels; catalytic materials

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