Nijara Das , Sudem Borgayary , Riu Riu Wary , Pranjal Kalita
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引用次数: 0
摘要
在这项研究中,通过三聚氰胺和硼酸的热共聚,成功制备了掺硼氮化石墨碳材料(BgCN-x)。利用粉末 X 射线衍射 (PXRD)、傅立叶变换红外光谱 (FT-IR)、紫外-可见光谱 (UV-Vis)、场发射扫描电子显微镜 (FESEM) 等多种技术对其进行了综合表征、能量色散 X 射线光谱(EDS)、场发射透射电子显微镜(FETEM)和 X 射线光电子能谱(XPS)显示,通过取代碳原子或氮原子,硼在 g-C3N4 的三-s-三嗪环中均匀掺杂。此外,还利用 CO2-TPD 技术评估了催化剂的基本位点浓度。在水杨醛与丙二酸二乙酯在碱催化下进行克诺文纳格尔缩合以合成香豆素的过程中,BgCN 催化剂的催化活性明显增强。这项工作强调了掺硼或二维硼主导材料作为无金属异相碱催化候选材料的潜力,为该领域的进一步发展铺平了道路。
Metal-free solid base catalysis: Boron-doped graphitic carbon nitride for the efficient synthesis of ethyl coumarin-3-carboxylate
In this work, boron doped graphitic carbon nitride materials (BgCN-x) were successfully prepared by thermal copolymerization of melamine and boric acid. The comprehensive characterization using various techniques, including powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), UV-Visible spectroscopy (UV-Vis), Field emission scanning electron microscopy (FESEM), Energy-Dispersive X-ray spectroscopy (EDS), Field emission transmission electron microscopy (FETEM), and X-ray photoelectron spectroscopy (XPS) revealed the uniform doping of boron in the tri-s-triazine rings of g-C3N4 by substituting the carbon or nitrogen atoms. Furthermore, the basic site concentrations of the catalysts were evaluated using CO2-TPD technique. The BgCN catalysts exhibited significantly enhanced catalytic activity in the base-catalyzed Knoevenagel condensation between salicylaldehyde and diethyl malonate for coumarin synthesis. This work underscores the potential of boron-doped or two-dimensional boron-dominant materials as promising candidates for metal-free heterogeneous base catalysis, paving the way for further advancements in the field.
期刊介绍:
Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications.
Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.