n-Alkane isomerization on heteropolyacids |
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| Authors: | A V Ivanov T V Vasina O V Masloboishchikova E G Khelkovskaya-Sergeeva L M Kustov J I Houzvička |
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| Institution: | (1) N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 117913 Moscow, Russian Federation;(2) Haldor Topsoe A/S, DK-2800 Lyngby, Denmark |
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| Abstract: | Acid-base properties of bulk 12-tungstophosphoric heteropolyacid (HPWA) and HPWA supported on alumina and fluorinated alumina
were studied by DRIFT spectroscopy using adsorption of probe molecules. Catalytic properties of Pt-containing catalysts carried
by these supports were studied inn-pentane isomerization. It was shown that the Pt/HPWA/Al2O3 system is almost inactive in isomerization as a result of the interaction of HPWA with basic sites of the alumina support.
On the contrary, the presence of acidic sites in fluorinated alumina prevents HPWA destruction and favors the uniform distribution
of HPWA on the support surface. As a result, enhancement of the activity and selectivity of the Pt/HPWA/Al2O3-F catalyst inn-pentane isomerization is observed.
Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1744–1750, October, 2000. |
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| Keywords: | heteropolyacids 12-tungstophosphoric heteropolyacid isomerization n-pentane platinum adsorption acidity probe molecules basicity IR spectroscopy DRIFT spectroscopy |
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