Hareesh H N, Minchitha K U, Nagaraju N, Kathyayini N
Centre for Incubation Innovation Research and Consultancy (CIIRC), Jyothy Institute of Technology Campus, Tataguni Off Kanakapura Road, Bengaluru 560082, Karnataka, India.
Department of Chemistry, St. Joseph's College P.G. Centre, 46, Langford Road, Shanthinagar, Bengaluru 560027, Karnataka, India.
J Nanosci Nanotechnol. 2020 Feb 1;20(2):840-851. doi: 10.1166/jnn.2020.16929.
A mixture of Cu (10%) and Fe (1 to 9%) was deposited on multiwalled carbon nanotubes (MWCNTs) and mesoporous carbon (MC). The catalytic activity was investigated in a reaction between carboxylic acids/esters and aromatic amines. The physico-chemical properties of the materials were characterized by different analytical techniques such as powder XRD (X-ray diffraction), BET (brunauer emmett teller) surface area, XPS (X-ray photoelectron spectroscopy), TPD-NH₃ (thermal desorption spectroscopy), SEM-EDS (scanning electron microscopy-energy dispersive spectroscopy) and TEM (transmission electron microscopy). The catalytic activity was investigated in the synthesis of aliphatic and aromatic amides from aliphatic/aromatic carboxylic acids and esters with aniline/benzyl amine. The yields of the product/s were in the range 30 to 92% with 100% selectivity. The percentage yield of amides from esters was found to be less than that of corresponding acids. Cu along with 5% of Fe supported on MWCNTs was found to be a better catalyst than when supported on MC, with respect to the isolated yield of the product/s and recyclability. The catalytic activity of the materials had a good correlation with their surface acidity. A plausible reaction mechanism has been proposed.
将铜（10%）和铁（1%至9%）的混合物沉积在多壁碳纳米管（MWCNT）和介孔碳（MC）上。在羧酸/酯与芳香胺之间的反应中研究了其催化活性。通过粉末XRD（X射线衍射）、BET（布鲁瑙尔-埃米特-泰勒）比表面积、XPS（X射线光电子能谱）、TPD-NH₃（热脱附光谱）、SEM-EDS（扫描电子显微镜-能量色散光谱）和TEM（透射电子显微镜）等不同分析技术对材料的物理化学性质进行了表征。在由脂肪族/芳香族羧酸和酯与苯胺/苄胺合成脂肪族和芳香族酰胺的过程中研究了催化活性。产物的产率在30%至92%范围内，选择性为100%。发现酯生成酰胺的百分产率低于相应酸的百分产率。就产物的分离产率和可回收性而言，负载在MWCNT上的铜与5%的铁被发现是比负载在MC上更好的催化剂。材料的催化活性与其表面酸度具有良好的相关性。提出了一种合理的反应机理。
