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

IF 3.5 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Research on Chemical Intermediates Pub Date : 2025-08-18 DOI:10.1007/s11164-025-05706-1

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

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引用次数: 0

Abstract

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.

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介孔CaO/SBA-15负载的银纳米颗粒上，苯胺和苯甲醇高选择性合成n -苄基苯胺

本文主要研究了介孔CaO/SBA-15 （Ag/CaSBA-15）催化剂负载的银纳米颗粒的合成和催化评价，用于苯甲醇和苯胺的选择性脱氢偶联制备n -苄基苯胺（NBA）。采用浸渍法制备了一系列不同载银量（2.5 ~ 10 wt%）的CaO和Ag改性SBA-15催化剂，并用XRD、TG-DSC、FT-IR、CO2-TPD、BET、XPS和TEM对其进行了系统表征。粉末XRD和BET分析证实了CaO和Ag改性后SBA-15的介孔结构保持不变。孔径分布较窄，最大孔径在8 ~ 9 nm左右。此外，XRD测定的Ag的平均晶粒尺寸（~ 12 nm）与TEM观察结果（平均尺寸~ 10 nm）吻合良好。优化后的催化剂（5Ag/CaSBA-15）在120℃无溶剂条件下，苯甲醇转化率为98%，选择性为99%。TEM、XPS、XRD、N2吸附和BET孔径分析证实了Ag纳米粒子的均匀分散。高分辨率的TEM图像也突出了CaSBA-15支架和嵌入的Ag NPs的相互连接的形态。各种苯甲醇和苯胺底物有效地转化为相应的亚胺，获得了良好的收率。此外，该催化剂表现出优异的可重复使用性，在5个反应周期内保持高性能，结构降解最小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Research on Chemical Intermediates 化学-化学综合

CiteScore

5.70

自引率

18.20%

发文量

229

审稿时长

2.6 months

期刊介绍： Research on Chemical Intermediates publishes current research articles and concise dynamic reviews on the properties, structures and reactivities of intermediate species in all the various domains of chemistry. The journal also contains articles in related disciplines such as spectroscopy, molecular biology and biochemistry, atmospheric and environmental sciences, catalysis, photochemistry and photophysics. In addition, special issues dedicated to specific topics in the field are regularly published.