Pentane transformations over sulfated alumina catalyst

Marek Marczewski , D. Popielarska , Hanna Marczewska

Abstract

The transformation of n-pentane at 295 K in the presence of catalysts of defined acid strength from −9.6 to −15 HO units were studied. The results were compared with those for Al2O3−SO2−4Al2O3−SO42− (8 %) of acid strength equal to −11.5 < HO ≤ −10.8. It was found that: (a) for superacids of acid strength HO < −13, the reaction begins with the protonation of the C–H σ bond of a pentane and proceeds according to the bimolecular mechanism; (b) for less acidic catalysts such as sulfated alumina, pentane is oxidized to pentene, which is converted to the pentyl cation after protonation. The latter reacts in the presence of catalysts of acid strength of at least HO equal to −9.6 according to two pathways: (a) unimolecular at an excess of H− (in the presence of additional hydride donor pentane co-substrate) with selective formation of 2-methylbutane; (b) bimolecular in the absence of H− (pentane alone is the substrate). In the latter case, the transformation proceeds through the formation of a ten-carbon dimer cation state, which upon decomposition leads to 2-methylpropane, 2-methylbutane and unsaturated coke precursors.
Author Marek Marczewski KTCh
Marek Marczewski,,
- Chair of Chemical Technology
, D. Popielarska KTCh
D. Popielarska,,
- Chair of Chemical Technology
, Hanna Marczewska KTCh
Hanna Marczewska,,
- Chair of Chemical Technology
Journal seriesReaction Kinetics Mechanisms and Catalysis, ISSN 1878-5190
Issue year2016
Vol118
No1
Pages267-280
Publication size in sheets0.65
Keywords in Englishpentane, isomerization, superacids, sulfated alumina
DOIDOI:10.1007/s11144-016-0978-9
URL http://link.springer.com/article/10.1007/s11144-016-0978-9
Languageen angielski
File
Reac Kinet Mech Cat 118 (2016) 267-280.pdf (file archived - login or check accessibility on faculty) Reac Kinet Mech Cat 118 (2016) 267-280.pdf 620 KB
Score (nominal)15
ScoreMinisterial score = 15.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 15.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 1.264 (2) - 2016=1.143 (5)
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