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<p>The present work focuses on the synthesis and catalytic evaluation of Ag nanoparticles supported on mesoporous CaO/SBA-15 (Ag/CaSBA-15) catalysts for the selective dehydrogenative coupling of benzyl alcohol and aniline to produce N-benzylideneaniline (NBA). A series of CaO and Ag-modified SBA-15 catalysts with varying Ag loadings (2.5–10&#xa0;wt%) were synthesized via the impregnation method and systematically characterized using XRD, TG-DSC, FT-IR, CO<sub>2</sub>-TPD, BET, XPS, and TEM. Powder XRD and BET analysis confirm the retention of mesoporous structure of SBA-15 after modification with CaO and Ag. The pore size distribution is narrow, with peak maxima around 8–9&#xa0;nm. Additionally, the average crystallite size of Ag determined by XRD (~ 12&#xa0;nm) aligns well with TEM observations (average size ~ 10&#xa0;nm). The optimized catalyst (5Ag/CaSBA-15) exhibited 98% conversion of benzyl alcohol with &gt; 99% selectivity to NBA at 120&#xa0;°C under solvent-free conditions. Analysis by TEM, XPS, XRD, N<sub>2</sub> sorption, and pore size by BET confirmed the uniform dispersion of Ag NPs. High-resolution TEM images also highlight the interconnected morphology of the CaSBA-15 support and the embedded Ag NPs. Various benzyl alcohol and aniline substrates were efficiently converted into their corresponding imines, achieving good to excellent yields. Furthermore, the catalyst exhibited excellent reusability, maintaining high performance over 5 reaction cycles with minimal structural degradation.</p>

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Highly selective synthesis of N-benzylideneaniline from benzyl alcohol and aniline over mesoporous CaO/SBA-15 supported Ag nanoparticles

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • M. Victor Prem Sagar,
  • Ravada Kishore,
  • Ravi Kumar Marella,
  • Tie Yu,
  • Ummareddy Venkata Subba Reddy

摘要

The present work focuses on the synthesis and catalytic evaluation of Ag nanoparticles supported on mesoporous CaO/SBA-15 (Ag/CaSBA-15) catalysts for the selective dehydrogenative coupling of benzyl alcohol and aniline to produce N-benzylideneaniline (NBA). A series of CaO and Ag-modified SBA-15 catalysts with varying Ag loadings (2.5–10 wt%) were synthesized via the impregnation method and systematically characterized using XRD, TG-DSC, FT-IR, CO2-TPD, BET, XPS, and TEM. Powder XRD and BET analysis confirm the retention of mesoporous structure of SBA-15 after modification with CaO and Ag. The pore size distribution is narrow, with peak maxima around 8–9 nm. Additionally, the average crystallite size of Ag determined by XRD (~ 12 nm) aligns well with TEM observations (average size ~ 10 nm). The optimized catalyst (5Ag/CaSBA-15) exhibited 98% conversion of benzyl alcohol with > 99% selectivity to NBA at 120 °C under solvent-free conditions. Analysis by TEM, XPS, XRD, N2 sorption, and pore size by BET confirmed the uniform dispersion of Ag NPs. High-resolution TEM images also highlight the interconnected morphology of the CaSBA-15 support and the embedded Ag NPs. Various benzyl alcohol and aniline substrates were efficiently converted into their corresponding imines, achieving good to excellent yields. Furthermore, the catalyst exhibited excellent reusability, maintaining high performance over 5 reaction cycles with minimal structural degradation.