Aerobic Oxidation of Vanillyl Alcohol to Vanillin Over CeO2‐Co3O4 Catalyst

• Published in: ChemistrySelect (Weinheim) 2024-10, Vol.9 (40), p.n/a
• Main Authors: Manojkumar, Palnati, Yogendra, Kamma, Sai Megana, V., Nazeer, Silligandla, Sitaramulu, Palli, Chandrashekar, Pendem, Reddy, Benjaram M., Venkateshwar Rao, Tumula
• Format: Article
• Language: English
• Subjects: Aerobic oxidation; CeO2. Co3O4. CeO2−Co3O4 catalyst; Synergetic interaction; Vanillin; Vanillyl alcohol
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.202400869

A promising CeO2‐Co3O4 (9 : 1 mole ratio based on oxides) non‐noble metal based mixed oxide catalyst was explored for selective oxidation of vanillyl alcohol with molecular oxygen to produce vanillin under atmosphere pressure. In particular, to enhance its efficiency, this catalyst was prepared by adopting different preparation methods namely, template assisted, coprecipitation with and without surfactant, wet‐impregnation, and solution combustion. The prepared catalysts were characterized by XRD, Raman, BET surface area, ICP‐OES, FE‐SEM, HR‐TEM, H2‐TPR, and XPS. Among various catalysts investigated, the template assisted synthesized catalyst exhibited superior activity (100 % conversion and selectivity) and high stability. The better activity of this catalyst was found to be due to reduced crystallite size, high specific surface area (92 m2/g), more surface oxygen, and improved redox behaviour as confirmed from XRD, BET surface area, XPS, and H2‐TPR analysis, respectively. The stability of the catalyst was tested by reusability test and was observed that there is not much decrease in the catalytic activity up to five cycles. Further, the catalytic activity was optimized by varying the reaction parameters such as time, solvent, temperature, and catalyst weight. This study explores the synthesis of a CeO2−Co3O4 (9 : 1) mixed oxide catalysts through different methods and evaluation of the catalytic efficiency for the selective oxidation of vanillyl alcohol to produce vanillin using molecular oxygen under atmospheric pressure. The research thoroughly examines the physicochemical properties of the CeO2−Co3O4 (9 : 1) mixed oxide. Among the various catalysts studied, the one prepared by template‐assisted method demonstrates superior activity.