Recyclable Nanocrystalline Copper Based on MoO3/SiO2 as an Efficient Catalyst for Acylation of Amines

Abstract

Various loadings of copper supported on MoO3/SiO2 (CMS) were prepared by sol-gel method and used for the synthesis of substituted benzimidazole. Further it was characterized by using X‐ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), Transmission Electron Microscopy (TEM), and acidity measurement by potentiometric method. XRD results indicated that Cu is present on the support primarily as CuO. The SEM and TEM results showed dispersion of cubic CuO nanoparticles on the surface. These mixed oxides were studied for the acylation of o-phenylene diamine with acetic acid in liquid phase. 10 wt. % CMS gave best results at 110 ºC with 94.81 % conversion of o-phenylene diamine and 100 % selectivity of substituted benzimidazole. Different parameters were studied for optimization of acylation, such as: temperature, acylating agents, solvents, amount of catalyst, and different catalysts. The CMS catalyst could also be recovered and reused at three times without any discernible decrease in its catalytic activity. Copyright © 2018 BCREC Group. All rights reservedReceived: 20th January 2018; Revised: 28th September 2018; Accepted: 30th September 2018; Available online: 25th January 2019; Published regularly: April 2019How to Cite: Deshmukh, J.M., Dagade, S.P. (2019). Recyclable Nanocrystalline Copper Based on MoO3/SiO2 as an Efficient Catalyst for Acylation of Amines. Bulletin of Chemical Reaction Engineering & Catalysis, 14 (1): 93-104 (doi:10.9767/bcrec.14.1.2111.93-104)Permalink/DOI: https://doi.org/10.9767/bcrec.14.1.2111.93-104