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Received April 20, 2015
Accepted June 12, 2015
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Ethylene and mixed 2-butene cis/trans isomers metathesis: Influence of lanthanum as a second metal on the WO3/SiO2 catalysts
Narongrat Poovarawan1 2
Thidaya Thitiapichart1 3
Kongkiat Suriye4
Joongjai Panpranot1 3
Wimonrat Limsangkass1 3
Francisco José Cadete Santos Aires2
and Piyasan Praserthdam1 3†
1Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand 2Institut de Recherches sur la Catalyse et l’Environnement de Lyon, UMR 5256 CNRS/Université Lyon1 2 Avenue Albert Einstein, 69626 Villeurbanne Cedex, France 3, Thailand 4SCG Chemicals, Co., Ltd., 1 Siam Cement Road, Bangsue, Bangkok 10800, Thailand
Korean Journal of Chemical Engineering, January 2016, 33(1), 140-146(7), 10.1007/s11814-015-0126-7
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Abstract
Lanthanum (0.5, 0.6, 0.75, 0.9 and 1 wt%) was added as a second metal on the 9 wt% WO3/SiO2 catalysts by the incipient wetness impregnation method. The catalysts were tested in the metathesis reaction of ethylene and 2-butene using either pure 2% trans-2-butene and the mixture of 1% cis- and 1% trans-2-butene as the reaction feed and were characterized by X-ray diffraction (XRD), nitrogen physisorption (BET), inductively coupled plasma optical emission spectrometry (ICP-OES), scanning electron microscopy, ion-exchange titration, FT-Raman, ammonia temperature programmed desorption (NH3-TPD) and reactant temperature programmed desorption (reactant-TPD). An optimum lanthanum loading at 0.5 wt% could improve dispersion of tungsten active phase and adsorption properties of the reactants on the catalysts. The adsorption of the mixed cis/trans-2-butene isomer was much improved on the La-WO3/SiO2 catalysts with 0.5 wt% La.
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