Selective Oxidation of Biomass-Derived Alcohols and Aromatic and Aliphatic Alcohols to Aldehydes with O/Air Using a RuO-Supported MnO Catalyst.
Journal:
ACS omega
Published Date:
Jul 17, 2018
Abstract
Selective catalytic oxidation of carbohydrate-derived 5-hydroxymethylfurfural, furfuryl alcohol, and various aromatic and aliphatic compounds to the corresponding aldehyde is a challenging task. The development of a sustainable heterogeneous catalyst is crucial in achieving high selectivity for the desired aldehyde, especially using O or air. In this study, a RuO-supported MnO catalyst is reported for the selective oxidation reaction. Treatment of MnO molecular sieves with RuCl in aqueous formaldehyde solution gives a new type of RuO-supported MnO catalyst. Detailed catalyst characterization using powder X-ray diffraction, N adsorption, scanning and transmission electron microscopes, diffuse reflectance UV-visible spectrometer, and X-ray photoelectron spectroscopy proves that the RuO species are dispersed on the highly crystalline MnO surface. This catalytic conversion process involves molecular oxygen or air (flow, 10 mL/min) as an oxidant. No external oxidizing reagent, additive, or cocatalyst is required to carry out this transformation. This oxidation protocol affords 2,5-diformylfuran, 2-formylfuran, and other aromatic and aliphatic aldehydes in good to excellent yield (70-99%). Moreover, the catalyst is easily recycled and reused without any loss in the catalytic activity.
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