Sustainable catalytic transformation of bio-based alcohols to high value-added fine chemicals is an important topic of research. This work described preparation of simple and economical Pd@Glu-HTC catalyst from biomass derived low cost -glucose. Hydrothermal carbonization of glucose was carried out in first step to synthesize Glu-HTC support in a simpler, greener, economical and efficient manner followed by incorporation of palladium metal on surface of the catalyst in second step. The catalyst was characterized using techniques such as Fourier Transform Infrared Spectroscopy (FT-IR), Solid-state Cross-Polarization Magic Angle Spinning Carbon-13 (13C CPMAS), Energy-dispersive X-ray spectroscopy (EDAX), Powder X-ray diffraction (P-XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetric/Differential Thermal Analyzer (TG-DTA), Field emission scanning electron microscopy (FE-SEM) and High-resolution transmission electron microscopy (HR-TEM). The catalyst was evaluated for direct oxidation of alcohols to yield carboxylic acids and exhibited very good catalytic activity for wider substrate scope. Oxidation of alcohols was carried out using milder base, molecular oxygen and water as a solvent to achieve 92–99 % excellent yields. The practical utility of current strategy was also studied for gram scale synthesis of bio-based value added industrially important chemicals such as furoic acid (flavouring agent and preservative in industry), 2, 5-furan-dicarboxylic acid (monomer to 100 % fossil-free, recyclable polymer polyethylene furanoate (PEF), tetrahydro-2-furoic acid (production of many drugs) and vanillin (important product of flavor and fragrance industry). Pd@Glu-HTC catalyst was found to be reusable for four recycles and the catalytic performance was retained without any loss in its activity after four cycles.

中文翻译：

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使用简单且经济的 Pd@Glu-HTC 催化剂将醇直接氧化为羧酸：基于生物质的增值化学品的实用且可扩展的方法


生物基醇可持续催化转化为高附加值精细化学品是一个重要的研究课题。这项工作描述了从生物质衍生的低成本葡萄糖中制备简单且经济的 Pd@Glu-HTC 催化剂。第一步对葡萄糖进行水热碳化，以更简单、更环保、经济、高效的方式合成Glu-HTC载体，第二步在催化剂表面掺入钯金属。使用傅里叶变换红外光谱 (FT-IR)、固态交叉偏振魔角旋转碳 13 (13C CPMAS)、能量色散 X 射线光谱 (EDAX)、粉末 X 射线等技术对催化剂进行了表征衍射 (P-XRD)、X 射线光电子能谱 (XPS)、热重/差热分析仪 (TG-DTA)、场发射扫描电子显微镜 (FE-SEM) 和高分辨率透射电子显微镜 (HR-TEM)。该催化剂用于直接氧化醇生成羧酸，并在更广泛的底物范围内表现出非常好的催化活性。使用较温和的碱、分子氧和水作为溶剂进行醇的氧化，以实现 92-99% 的优异产率。还研究了当前策略的实际效用，用于克级合成生物基增值工业重要化学品，例如糠酸（工业调味剂和防腐剂）、2, 5-呋喃二甲酸（100%化石燃料的单体）免费、可回收的聚合物聚乙烯呋喃酸酯（PEF）、四氢-2-糠酸（许多药物的生产）和香草醛（香精香料工业的重要产品）。 研究发现 Pd@Glu-HTC 催化剂可重复使用四次循环，并且在四次循环后催化性能保持不变，活性没有任何损失。