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Article: Characteristic and mechanism of methane dehydroaromatization over Zn-based/HZSM-5 catalysts under conditions of atmospheric pressure and supersonic jet expansion

TitleCharacteristic and mechanism of methane dehydroaromatization over Zn-based/HZSM-5 catalysts under conditions of atmospheric pressure and supersonic jet expansion
Authors
Issue Date2011
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/
Citation
Journal Of Physical Chemistry C, 2011, v. 115 n. 34, p. 16954-16962 How to Cite?
AbstractThe catalytic performance of Zn-based/HZSM-5 catalysts prepared by wet impregnation method was investigated for the methane dehydroaromatization (MDA) reaction under the conditions of atmospheric pressure and supersonic jet expansion (SJE). The physical properties of the catalysts were characterized by Brunauer-Emmett-Teller (BET), Fourier transform infrared (FT-IR), temperature-programmed reduction of H 2 (H 2-TPR), temperature-programmed desorption of NH 3 (NH 3-TPD), X-ray photoelectron spectroscopy (XPS), thermogravimetric and differential thermogravimetric (TG/DTG), and high-resolution transmission electron microscopy (HRTEM) techniques. The results revealed that under SJE condition the Zn/HZSM-5 catalyst exhibited high catalytic activity. It was found that because of the rapid migration of H + ions on the catalyst, the activation of CH 4 at active sites of nano-ZnO is facile. A new reaction mechanism that involves an active "ZnO-CH 3 +... -HZnO" intermediate formed as a result of synergetic action between ZnO and HZSM-5 has been proposed for CH 4 dissociation and dehydrogenation. Under atmospheric pressure, however, the catalytic activity of Zn/HZSM-5 is low. © 2011 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/142328
ISSN
2015 Impact Factor: 4.509
2015 SCImago Journal Rankings: 1.995
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administrative Region, ChinaHKU 7015/07P
Funding Information:

The work described here was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (project no. HKU 7015/07P).

References

 

DC FieldValueLanguage
dc.contributor.authorLiu, BSen_HK
dc.contributor.authorZhang, Yen_HK
dc.contributor.authorLiu, JFen_HK
dc.contributor.authorTian, Men_HK
dc.contributor.authorZhang, FMen_HK
dc.contributor.authorAu, CTen_HK
dc.contributor.authorCheung, ASCen_HK
dc.date.accessioned2011-10-28T02:43:13Z-
dc.date.available2011-10-28T02:43:13Z-
dc.date.issued2011en_HK
dc.identifier.citationJournal Of Physical Chemistry C, 2011, v. 115 n. 34, p. 16954-16962en_HK
dc.identifier.issn1932-7447en_HK
dc.identifier.urihttp://hdl.handle.net/10722/142328-
dc.description.abstractThe catalytic performance of Zn-based/HZSM-5 catalysts prepared by wet impregnation method was investigated for the methane dehydroaromatization (MDA) reaction under the conditions of atmospheric pressure and supersonic jet expansion (SJE). The physical properties of the catalysts were characterized by Brunauer-Emmett-Teller (BET), Fourier transform infrared (FT-IR), temperature-programmed reduction of H 2 (H 2-TPR), temperature-programmed desorption of NH 3 (NH 3-TPD), X-ray photoelectron spectroscopy (XPS), thermogravimetric and differential thermogravimetric (TG/DTG), and high-resolution transmission electron microscopy (HRTEM) techniques. The results revealed that under SJE condition the Zn/HZSM-5 catalyst exhibited high catalytic activity. It was found that because of the rapid migration of H + ions on the catalyst, the activation of CH 4 at active sites of nano-ZnO is facile. A new reaction mechanism that involves an active "ZnO-CH 3 +... -HZnO" intermediate formed as a result of synergetic action between ZnO and HZSM-5 has been proposed for CH 4 dissociation and dehydrogenation. Under atmospheric pressure, however, the catalytic activity of Zn/HZSM-5 is low. © 2011 American Chemical Society.en_HK
dc.languageengen_US
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/en_HK
dc.relation.ispartofJournal of Physical Chemistry Cen_HK
dc.titleCharacteristic and mechanism of methane dehydroaromatization over Zn-based/HZSM-5 catalysts under conditions of atmospheric pressure and supersonic jet expansionen_HK
dc.typeArticleen_HK
dc.identifier.emailCheung, ASC:hrsccsc@hku.hken_HK
dc.identifier.authorityCheung, ASC=rp00676en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/jp2027065en_HK
dc.identifier.scopuseid_2-s2.0-80052159714en_HK
dc.identifier.hkuros197102en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80052159714&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume115en_HK
dc.identifier.issue34en_HK
dc.identifier.spage16954en_HK
dc.identifier.epage16962en_HK
dc.identifier.eissn1932-7455-
dc.identifier.isiWOS:000294146700029-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLiu, BS=24399628800en_HK
dc.identifier.scopusauthoridZhang, Y=48862027700en_HK
dc.identifier.scopusauthoridLiu, JF=48861305600en_HK
dc.identifier.scopusauthoridTian, M=7202800218en_HK
dc.identifier.scopusauthoridZhang, FM=36912985600en_HK
dc.identifier.scopusauthoridAu, CT=7102805683en_HK
dc.identifier.scopusauthoridCheung, ASC=7401806538en_HK

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