caa a22 4500 475843606 CHVBK 20180406123907.0 cr unu---uuuuu 170329e20000401xx s 000 0 eng 10.1023/A:1027229915673 doi (NATIONALLICENCE)springer-10.1023/A:1027229915673 Transformation of propane, n -butane and n -hexane over H3PW12O40 and cesium salts. Comparison to sulfated zirconia and mordenite catalysts [Elektronische Daten] [M. Guisnet, Ph. Bichon, N.S. Gnep, N. Essayem] Over H3PW12O40 and its acidic cesium salts at 250°C, alkane transformations occur through the mechanisms previously proposed for sulfated zirconia and mordenite catalysts: propane is mainly transformed into butanes through a trimerization-isomerization-cracking process, n-butane into isobutane, propane and pentanes through a dimerization-isomerization-cracking process, n-hexane into methylpentanes and 2,3-dimethylbutane through a monomolecular mechanism. With all the samples, n-butane transformation is initially much faster than propane transformation, the difference in rate increasing significantly with the Cs content: from 25 times with H3PW12O40 to 350 times with Cs2.4H0.6PW12O40. On the other hand, n-hexane transformation is 2.3 to 7 times faster than n-butane transformation. A decrease in acid strength and in acid site density with Cs introduction is proposed to explain the increase in the rate ratios. For all the reactions, sulfated zirconia pretreated at 600°C is 2-3 times more active than the heteropolycompounds. HMOR10 which is the most active catalyst for n-hexane transformation is the least active for n-butane and especially propane transformation. This very low activity of mordenite for these bimolecular processes can be related to particularities of its pore system: bimolecular reactions are strongly unfavoured in the narrow non-interconnected channels of this zeolite. Kluwer Academic Publishers, 2000 heteropolycompounds nationallicence sulfated zirconia nationallicence mordenite nationallicence alkane transformation nationallicence mechanisms nationallicence acidity nationallicence Guisnet M. Laboratoire de Catalyse en Chimie Organique, UMR 6503, Faculté des Sciences Fondamentales et Appliquées, Université de Poitiers, 40 avenue du recteur Pineau, 86022, Poitiers Cedex, France aut Bichon Ph Laboratoire de Catalyse en Chimie Organique, UMR 6503, Faculté des Sciences Fondamentales et Appliquées, Université de Poitiers, 40 avenue du recteur Pineau, 86022, Poitiers Cedex, France aut Gnep N.S. Laboratoire de Catalyse en Chimie Organique, UMR 6503, Faculté des Sciences Fondamentales et Appliquées, Université de Poitiers, 40 avenue du recteur Pineau, 86022, Poitiers Cedex, France aut Essayem N. Institut de Recherches sur la Catalyse, CNRS, 2 avenue Albert Einstein, 69626, Villeurbanne Cedex, France aut Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 11-12/1-4(2000-04-01), 247-254 1022-5528 11-12:1-4<247 2000 11-12 11244 https://doi.org/10.1023/A:1027229915673 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1027229915673 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Guisnet M. Laboratoire de Catalyse en Chimie Organique, UMR 6503, Faculté des Sciences Fondamentales et Appliquées, Université de Poitiers, 40 avenue du recteur Pineau, 86022, Poitiers Cedex, France aut NATIONALLICENCE 700 1- Bichon Ph Laboratoire de Catalyse en Chimie Organique, UMR 6503, Faculté des Sciences Fondamentales et Appliquées, Université de Poitiers, 40 avenue du recteur Pineau, 86022, Poitiers Cedex, France aut NATIONALLICENCE 700 1- Gnep N.S. Laboratoire de Catalyse en Chimie Organique, UMR 6503, Faculté des Sciences Fondamentales et Appliquées, Université de Poitiers, 40 avenue du recteur Pineau, 86022, Poitiers Cedex, France aut NATIONALLICENCE 700 1- Essayem N. Institut de Recherches sur la Catalyse, CNRS, 2 avenue Albert Einstein, 69626, Villeurbanne Cedex, France aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 11-12/1-4(2000-04-01), 247-254 1022-5528 11-12:1-4<247 2000 11-12 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer