Pocker Sahib Memorial Orphanage College, Tirurangadi, Malappuram, Tirurangadi Road, Tirurangadi 676306, Kerala, India.
St. Joseph's College (Autonomous), Devagiri, Kozhikode 673008, Kerala, India.
J Nanosci Nanotechnol. 2020 Sep 1;20(9):5823-5832. doi: 10.1166/jnn.2020.17811.
In this paper, the application of cerium modified nanocrystalline zeolite ZSM-5 as catalyst for Friedel Crafts acylation of toluene was investigated and compared with nanocrystalline ZSM-5. The acylating agent used was acetic anhydride. The zeolite samples were characterized by means of Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), Thermal analysis, ammonia temperature-programmed desorption (NH₃-TPD) and Nitrogen sorption analysis. The results show an enhanced Lewis acidity, pore volume and surface area for cerium modified ZSM-5 providing a superior accessibility for acetic anhydride and toluene to the active sites compared to the unmodified one, thereby leading to 93% conversion of acetic anhydride, which was higher than that of unmodified ZSM-5 sample.
本文研究了铈改性纳米 ZSM-5 沸石作为催化剂在甲苯的 Friedel Crafts 酰化反应中的应用，并与纳米 ZSM-5 沸石进行了比较。所用的酰化剂是乙酸酐。通过傅里叶变换红外光谱（FTIR）、X 射线衍射分析（XRD）、扫描电子显微镜（SEM）、能谱（EDX）、热分析、氨程序升温脱附（NH₃-TPD）和氮气吸附分析对沸石样品进行了表征。结果表明，铈改性 ZSM-5 沸石具有增强的Lewis 酸性、孔体积和比表面积，使得乙酸酐和甲苯更容易接近活性位，与未改性的 ZSM-5 相比，转化率高达 93%，高于未改性的 ZSM-5 样品。
