Selective Oxidation of HMF via Catalytic and Photocatalytic Processes Using Metal-Supported Catalysts.

Alice Lolli,Simona Ortelli,Valeriia Maslova,Francesco Basile,Stefania Albonetti,Danilo Bonincontro

doi:10.3390/molecules23112792

Abstract

In this study, 5-hydroxymethylfurfural (HMF) oxidation was carried out via both the catalytic and the photocatalytic approach. Special attention was devoted to the preparation of the TiO2-based catalysts, since this oxide has been widely used for catalytic and photocatalytic application in alcohol oxidation reactions. Thus, in the catalytic process, the colloidal heterocoagulation of very stable sols, followed by the spray-freeze-drying (SFD) approach, was successfully applied for the preparation of nanostructured porous TiO2-SiO2 mixed-oxides with high surface areas. The versatility of the process made it possible to encapsulate Pt particles and use this material in the liquid-phase oxidation of HMF. The photocatalytic activity of a commercial titania and a homemade oxide prepared with the microemulsion technique was then compared. The influence of gold, base addition, and oxygen content on product distribution in the photocatalytic process was evaluated.

Highlights

Introduction5-hydroxymethylfurfural (HMF) oxidation was carried out via both the catalytic and the photocatalytic approach
The oxidation and photooxidation of HMF in water can provide environment-friendly methods to produce DFF and furandicarboxylic acid acid (FDCA), an important molecule serving as the starting point for the synthesis of bio-polymers
Catalytic materials based on TiO2 were shown to be active in both the thermal and photoactivated conditions, and the reaction network was significantly affected by the catalyst method of synthesis and composition

Summary

Introduction

5-hydroxymethylfurfural (HMF) oxidation was carried out via both the catalytic and the photocatalytic approach. Special attention was devoted to the preparation of the. TiO2 -based catalysts, since this oxide has been widely used for catalytic and photocatalytic application in alcohol oxidation reactions. In the catalytic process, the colloidal heterocoagulation of very stable sols, followed by the spray-freeze-drying (SFD) approach, was successfully applied for the preparation of nanostructured porous TiO2 -SiO2 mixed-oxides with high surface areas. The versatility of the process made it possible to encapsulate Pt particles and use this material in the liquid-phase oxidation of HMF. The photocatalytic activity of a commercial titania and a homemade oxide prepared with the microemulsion technique was compared. The influence of gold, base addition, and oxygen content on product distribution in the photocatalytic process was evaluated

Objectives

Methods

Conclusion