Journal
JOURNAL OF CATALYSIS
Volume 320, Issue -, Pages 26-32Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2014.09.004
Keywords
Chloroaluminate ionic liquid; Lewis acidity; Bronsted acidity; NMR; Acidic species; Alkylation
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Funding
- Shell Global Solutions International B.V., The Netherlands
- National Science Foundation of China [21036008, 21276275, 21206193, 20976194]
- Program for New Century Excellent Talents in the University of China [NCET-12-0970]
- Science Foundation of China University of Petroleum, Beijing [KYJJ2012-03-23, KYJJ2012-03-25]
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Chloroaluminate ionic liquids (ILs), especially composite ionic liquids (CILs) which are ILs modified with copper(I) chloride, are highly active and selective catalysts for the alkylation of 2-butene with isobutane. The Lewis and Bronsted acidic species of these ILs were investigated by NMR spectroscopy. Pyridine is found to be a suitable indicator. Lewis acidity arises mainly from Al2Cl7- having a chemical shift at 102 ppm in the Al-27 NMR spectrum, while Bronsted acidity arises from Al2Cl6OH- (chemical shift at 97 ppm). The peak at 94 ppm in the Al-27 NMR spectrum is related to Al2Cl5O-. These new insights have improved our understanding of the structure of the active species in chloroaluminate ionic liquid alkylation catalysts. (C) 2014 Elsevier Inc. All rights reserved.
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