Affiliation:
1. Department of Pharmaceutical Chemistry Telangana University Nizamabad 503322 India
2. Department of Chemistry University College of Science Satavahana University Karimnagar 505 002 India
3. Department of Chemistry Koneru Lakshmaiah Education Foundation, R V S Nagar Aziz Nagar (PO), Moinabad Road Hyderabad 500075 India
4. Department of Chemistry School of Science Gandhi Institute of Technology and Management (GITAM) University Hyderabad 502329 Telangana India
5. School of Chemistry & Physics University of KwaZulu-Natal Durban South Africa
Abstract
AbstractThis study explores a rational synthesis of a molybdenum‐promoted Ce−Si mixed oxide catalyst (MoO3/CeO2−SiO2) to regulate synergies between MoO3 and SiO2 dopant on CeO2, achieving high selectivity in solvent‐free catalytic oxidative coupling of amines to imines using molecular O2 as the oxidant. Comparative efficiency tests were conducted with bare CeO2, CeO2−SiO2, and MoO3/CeO2 catalysts. Characterization techniques, including XRD, Raman spectroscopy, N2‐adsorption‐desorption analysis, FTIR, NH3−TPD, TEM, and XPS, were employed to assess textural properties, acidic features, promoter and dopant dispersion in CeO2 lattice, and oxygen defects. Mo/Ce−Si catalyst exhibited superior acidic sites and a higher concentration of Ce3+ ions (Iu/ITotal), indicating increased oxygen vacancies. This catalyst demonstrated exceptional performance in the oxidative coupling of benzylamine, providing higher conversion and selectivity to the corresponding imine. Remarkably, the Mo/Ce−Si catalyst maintained consistent performance over five recycling runs. The catalyst also proved effective for the selective oxidative coupling of various amine substrates with diverse steric and electronic properties. Experimental results confirmed a plausible reaction mechanism within the concise catalyst design.
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2 articles.
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