title: Liquid phase nitration of benzene over supported ammonium salt of 12-molybdophosphoric acid catalysts prepared by sol-gel method.
abstract: A mild and clean liquid nitration of benzene with 65% nitric acid as nitrating agent over silica supported ammonium salt of 12-molybdophosphoric acid catalysts has been investigated. These catalysts with different loadings were prepared by sol-gel method and characterized by X-ray diffraction (XRD) and FTIR spectra. The acidity of these catalysts was measured by the potentiometric titration method. The XRD and IR analysis revealed that supported catalysts possess the Keggin structure which is similar to 12-molybdophosphoric acid. And it can be found that the supported catalysts had high nitration reaction catalytic activity and selectivity over nitrobenzene. The effects of various parameters such as nitric acid/benzene volume ratio, temperature and time of reaction have also been systematically studied.
authors.affiliation: Department of Chemistry, Liaocheng University, Liaocheng 252059, China. gongshw@lcu.edu.cn
authors.forename: Shuwen
authors.initials: S
authors.lastname: Gong
authors.forename: Lijun
authors.initials: L
authors.lastname: Liu
authors.forename: Qingxin
authors.initials: Q
authors.lastname: Cui
authors.forename: Junhong
authors.initials: J
authors.lastname: Ding
mesh_terms: D001554:Benzene / Q000737:chemistry*; D002384:Catalysis; D005782:Gels; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D008982:Molybdenum / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D010756:Phosphoric Acids / Q000737:chemistry*; D011199:Potentiometry; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D005782:Gels; D007202:Indicators and Reagents; D009566:Nitrates; D010756:Phosphoric Acids; D000644:Quaternary Ammonium Compounds; D012996:Solutions; D008982:Molybdenum; D001554:Benzene; C003125:phosphomolybdic acid