caa a22 4500 44538851X CHVBK 20180317143039.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s11144-011-0382-4 doi (NATIONALLICENCE)springer-10.1007/s11144-011-0382-4 Light alkane aromatization over modified Zn-ZSM-5 catalysts: characterization of the catalysts by hydrogen/deuterium isotope exchange [Elektronische Daten] [Krisztina Frey, Louis Lubango, Mike Scurrell, László Guczi] The selectivity obtained in the aromatization of propane over Zn-ZSM-5-based catalysts (Si/Al nominal ratio=35) increased from about 69% (carbon basis) to 74-91% when a second transition metal ion is introduced into the catalyst. The effect, previously reported for the case of Fe3+ ions, has now been shown to be more general and is seen also for the ions of chromium, cobalt or manganese. It is likely that these ions are present under aromatization conditions in a partially reduced state. H2/D2 isotope exchange rates show large enhancements on the reduced Fe-Zn/ZSM-5 and Co-Zn/ZSM-5 samples. This aspect of aromatization catalysis has not been reported before. Akadémiai Kiadó, Budapest, Hungary, 2011 Aromatization nationallicence Alkanes nationallicence Zinc-zeolites nationallicence Transition metal ions nationallicence H2/D2 exchange nationallicence Frey Krisztina Department of Surface Chemistry and Catalysis, Institute of Isotopes, P. O. Box 77, 1525, Budapest, Hungary aut Lubango Louis School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand Johannesburg, P O WITS, 2050, Johannesburg, South Africa aut Scurrell Mike School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand Johannesburg, P O WITS, 2050, Johannesburg, South Africa aut Guczi László Department of Surface Chemistry and Catalysis, Institute of Isotopes, P. O. Box 77, 1525, Budapest, Hungary aut Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 104/2(2011-12-01), 303-309 1878-5190 104:2<303 2011 104 11144 https://doi.org/10.1007/s11144-011-0382-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-011-0382-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Frey Krisztina Department of Surface Chemistry and Catalysis, Institute of Isotopes, P. O. Box 77, 1525, Budapest, Hungary aut NATIONALLICENCE 700 1- Lubango Louis School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand Johannesburg, P O WITS, 2050, Johannesburg, South Africa aut NATIONALLICENCE 700 1- Scurrell Mike School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand Johannesburg, P O WITS, 2050, Johannesburg, South Africa aut NATIONALLICENCE 700 1- Guczi László Department of Surface Chemistry and Catalysis, Institute of Isotopes, P. O. Box 77, 1525, Budapest, Hungary aut NATIONALLICENCE 773 0- Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 104/2(2011-12-01), 303-309 1878-5190 104:2<303 2011 104 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer