Document Type : Original Article
Authors
1
Egyptian Petroleum Research Institute, Nasr City, Cairo 11727, Egypt.
2
Chemistry Department Faculty of Women, Ain shams University,Heliopolis,Cairo,Egypt
3
Egyptian Petroleum Research Institute, Nasr City, Cairo 11727, Egypt
4
Egyptian Petroleum Research Institute, Nasr City, Cairo 11727, Egypt. AL-Ghad International College for Applied Medical Science, Kingdom of Saudi Arabia.
5
Egyptian Petroleum Research Institute, Nasr City, Cairo 11727, Egypt. Egypt nanotechnology center (EGNC) Cairo university, El-Shiekh Zayed, 12588, Egypt.
Abstract
One of the most important commercials industrial processes is liquid phase catalytic oxidation of p-xylene by oxygen for terephthalic acid (TPA) production. A recent catalytic system used environmentally benign N-hydroxyamide as a free radical promoter rather than more hazardous bromine molecules. An economical and easily prepared heterogeneous oxidation catalyst, nanorods manganese dioxide, was synthesized by ultrasonic technique. The crystal structure and morphology of the MnO2 were confirmed by HRTEM, XRD, and N2-adsorption-desorption isotherms. The prepared MnO2 nanorods had a high aspect ratio and surface area of 300 m2 g-1. The catalytic oxidation of p-toluic acid (PTA) to terephthalic acid using MnO2 nanorods was studied under the different conditions (reaction time, catalyst dosages, reaction solvent and varied pressures and temperatures) to control the yield and selectivity toward TPA synthesis. The obtained results showed that the high yield (88.9%) and conversion (90.1%) in ethyl acetate with fixed oxygen pressure (20 atm) at 150°C.
Keywords
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