화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.57, No.39, 12993-13000, 2018
Solvent-Free, Low-Temperature, Highly Efficient Catalytic Nitration of Toluene with NO2 Promoted by Molecular Oxygen over Immobilized AlCl3-SiO2
A mild and highly efficient method for solvent-free low temperature catalytic nitration of toluene with NO2 promoted by molecular oxygen has been developed in the present work. The immobilized AlCl3-SiO2 catalyst was successfully synthesized by a chemical bonding method. The results indicated that the synergistic catalysis of molecular oxygen and catalyst remarkably improved the nitration efficiency. Under optimal conditions, 86.5% of toluene conversion with 100% of selectivity to mononitrotoluene was achieved at 35 degrees C. Furthermore, the immobilized 10% AlCl3-SiO2 catalyst exhibited excellent stability in this nitration process. Finally, the probable reaction mechanism for the catalytic nitration promoted by molecular oxygen over AlCl3-SiO2 was suggested. This work affords a simple, highly efficient, safe, and benign approach for the preparation of valuable mononitrotoluene under the mild conditions and has potential industrial application prospects.