02178nas a2200193   4500008004100000022001400041245008900055210006900144260011000213300001600323490000600339520138500345100002401730700003701754700002601791700002201817700003001839856011501869       2014                        eng d  a2046-206900aGreen chemistry approach to styrene from ethylbenzene and air on MnxTi1-xO2 catalyst0 aGreen chemistry approach to styrene from ethylbenzene and air on  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcOCT  a57087-570970 v43 a<p>Styrene (ST) is an industrially important commodity chemical, and design of a suitable catalyst, which provides high ethyl benzene (EB) conversion and styrene selectivity at Lower temperature with sustainable activity, is one of the major challenges in the field of heterogeneous catalysis. Manganese incorporated in titania (MnxT1-xO2) anatase Lattice, prepared via the solution combustion method, was evaluated for oxidative dehydrogenation (ODH) of EB with O-2 or air. MnxTi1-xO2 catalysts were characterized by different physiochemical methods. Up to 15% Mn could be introduced into the TiO2 Lattice. TEM and XRD indicate disordered mesoporosity, further confirmed by adsorption isotherm analysis. MnxTi1-xO2 catalysts were evaluated for ST synthesis from EB using air or oxygen as oxidant between 440 and 570 degrees C. Reaction conditions have been varied systematically, such as catalyst composition, and EB/air/O-2 flow. MnxTi1-xO2 shows sustainable 55% styrene yield for 45 h without deactivation under optimum conditions. A thorough analysis of spent catalysts demonstrates the conversion of initial anatase phase MnxTi1-xO2 to Mn3O4 supported on the rutile (R) phase of TiO2. The above change occurs in the first few hours of reaction and the Mn3O4 on R-TiO2 phase is the active phase of the catalyst and responsible for sustainable activity for Longer duration.</p>1 aNegi, Sanjay, Singh1 aVenugopalan, Aswathy, Thareparam1 aRaja, Thirumalaiswamy1 aSingh, Anand, Pal1 aGopinath, Chinnakonda, S.  uhttps://library.ncl.res.in/content/green-chemistry-approach-styrene-ethylbenzene-and-air-mnxti1-xo2-catalyst-0