N-Hexane Isomerization on Pt-Containing Ti-Pillared Tagan’s Montmorillonite
Ti–pillared interlayered clays have been synthesized by the exchange reaction between acid modified Tagan montmorillonite in Na-form with an aqueous solutions of TiCl4 and characterized by XRD, N2–adsorption/desorption analyses, temperature-programmed desorption of ammonia (TPD NH3), transmission electron microscopy (TEM). The maximum conversion of n–hexane equal to 64.1 % was found on 0.35 %Pt/Ti (5,0) NaHMM + M-catalyst thus the yield of isohexanes makes 45.0 %. At the decrease of platinum amount to 0.1 %, the conversion of n-hexane decreases slightly it makes 61.7 %, and the yield of isohexanes increases by 1.4 %. According to TEM separate dense particles mainly with a sizes of 50–100 Å are shown. Morelarger particles have the sizes within 200 Å. These particles can be related to the mixture of the phases Pt, PtTi, Pt3Ti, TiO, TiO2 that testify about strong interaction of the supported metal Pt with the support with formation of intermetallids (PtTi, Pt3Ti) and oxides.
KeywordsThe isomerization N-hexane Titanium Mordenit Platinum Montmorillonite The catalyst Pillared clay
- 1.Vu, T.N., van Gestel, J., Gilson, J.P., et al.: Platinum-tungstated zirconia isomerization catalysts Part II. Effect of platinum and tungsten loading on the mechanism of isomerization of n-hexane: a kinetic study. J. Catal. 231, 468–479 (2005). doi: 10.1016/jcat2005.02.003
- 2.Gil, A., Korili, S.A., Vicente, M.A.: Recent advances in the control and characterization of the porous structure of pillared clay catalysts. J. Catal. Rev. 50, 153–221 (2008). doi: 10.1080/101614940802019383
- 3.De Stefanis, A., Tomlinson, A.A.G.: Towards designing pillared clays for catalysis. J. Catal. Today 114, 126–141 (2006). doi: 10.1016/jcattod.2006.01.019