{"title":"Propylene Self-Metathesis to Ethylene and Butene over WOx\/SiO2, Effect of Nano-Sized Extra Supports (SiO2 and TiO2)","authors":"A.Guntida, K. Suriye, S. Kunjara Na Ayudhya, J. Panpranot, P. Praserthdam","volume":101,"journal":"International Journal of Chemical and Molecular Engineering","pagesStart":487,"pagesEnd":491,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10001244","abstract":"
Propylene self-metathesis to ethylene and butene was
\r\nstudied over WOx\/SiO2 catalysts at 450oC and atmospheric pressure.
\r\nThe WOx\/SiO2 catalysts were prepared by incipient wetness
\r\nimpregnation of ammonium metatungstate aqueous solution. It was
\r\nfound that, adding nano-sized extra supports (SiO2 and TiO2) by
\r\nphysical mixing with the WOx\/SiO2 enhanced propylene conversion.
\r\nThe UV-Vis and FT-Raman results revealed that WOx could migrate
\r\nfrom the original silica support to the extra support, leading to a
\r\nbetter dispersion of WOx. The ICP-OES results also indicate that
\r\nWOx existed on the extra support. Coke formation was investigated
\r\non the catalysts after 10 h time-on-stream by TPO. However, adding
\r\nnano-sized extra supports led to higher coke formation which may be
\r\nrelated to acidity as characterized by NH3-TPD.<\/p>\r\n","references":"[1] Huang, S., et al., Metathesis of ethene and 2-butene to propene on\r\nW\/Al2O3\u2013HY catalysts with different HY contents, Journal of Molecular\r\nCatalysis A: Chemical, vol. 226, pp.61-68, 2005.\r\n[2] Spamer, A., et al., The reduction of isomerisation activity on a\r\nWO3\/SiO2 metathesis catalyst, Applied Catalysis A: General, vol. 255,\r\npp.153-167, 2003.\r\n[3] Zhao, Q., et al., Effect of tungsten oxide loading on metathesis activity\r\nof ethene and 2-butene over WO3\/SiO2 catalysts, Transition Metal\r\nChemistry, vol. 34, pp.621-627, 2009.\r\n[4] Chaemchuen, S., et al., The structure-reactivity relationship for\r\nmetathesis reaction between ethylene and 2-butene on WO3\/SiO2\r\ncatalysts calcinated at different temperatures, Kinetics and Catalysis,\r\nvol. 53, pp.247-252, 2012.\r\n[5] Spamer, A., et al., Application of a WO3\/SiO2 catalyst in an industrial\r\nenvironment: part II, Applied Catalysis A: General, vol. 255, pp.133-\r\n142, 2003.\r\n[6] Lee, E.L. and I.E. Wachs, In Situ Spectroscopic Investigation of the\r\nMolecular and Electronic Structures of SiO2 Supported Surface Metal\r\nOxides, The Journal of Physical Chemistry C, vol. 111, pp.14410-14425,\r\n2007.\r\n[7] Ross-Medgaarden, E.I. and I.E. Wachs, Structural Determination of\r\nBulk and Surface Tungsten Oxides with UV\u2212vis Diffuse Reflectance\r\nSpectroscopy and Raman Spectroscopy, The Journal of Physical\r\nChemistry C, vol. 111, pp.15089-15099, 2007.\r\n[8] Limsangkass, W., et al., Influence of micro- and nano-sized SiO2 excess\r\nsupport on the metathesis of ethylene and trans-2-butene to propylene\r\nover silica-supported tungsten catalysts, Reaction Kinetics, Mechanisms\r\nand Catalysis, vol. 113, pp.225-240, 2014.\r\n[9] Haber, J., T. Machej, and T. Czeppe, The phenomenon of wetting at\r\nsolid\/solid interface, Surface Science, vol. 151, pp.301-310, 1985.\r\n[10] Cruz, J.S.d., et al., Thermal spreading of WO3 onto zirconia support,\r\nApplied Surface Science, vol. 253, pp.3160-3167, 2007.\r\n[11] Debecker, D.P., et al., Facile preparation of MoO3\/SiO2-Al2O3 olefin\r\nmetathesis catalysts by thermal spreading, in Studies in Surface Science\r\nand Catalysis, M.D.S.H.P.A.J.J.A.M. E.M. Gaigneaux and P. Ruiz,\r\nEditors. 2010, Elsevier. p. 581-585.\r\n[12] Hoang, V.V. Molecular Dynamics Simulation of Amorphous SiO2\r\nNanoparticles., The Journal of Physical Chemistry B, vol. 111,\r\npp.12649-12656, 2007.\r\n[13] Navrotsky, A., Energetics of nanoparticle oxides: interplay between\r\nsurface energy and polymorphism. 2003, Geochem. Trans. p. 34\u201337.\r\n[14] Koch, C., Nanostructured Materials: Processing, Properties, and\r\nApplications. 2nd ed. 2007.\r\n[15] Huang, S., et al., The effect of calcination time on the activity of\r\nWO3\/Al2O3\/HY catalysts for the metathesis reaction between ethene and\r\n2-butene, Applied Catalysis A: General, vol. 323, pp.94-103, 2007.\r\n[16] Liu, H., et al., Production of propene from 1-butene metathesis reaction\r\non tungsten based heterogeneous catalysts, Journal of Natural Gas\r\nChemistry, vol. 18, pp.331-336, 2009.\r\n[17] Moodley, D.J., The metathesis activity and deactivation of\r\nheterogeneous metal oxide catalystic sytems. 2003: North-West\r\nUniversity, Potchefstroom Campus.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 101, 2015"}