DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, Ki-Yong | ko |
dc.contributor.author | Kang, Min-Young | ko |
dc.contributor.author | Ihm, Son-Ki | ko |
dc.date.accessioned | 2013-03-12T16:04:48Z | - |
dc.date.available | 2013-03-12T16:04:48Z | - |
dc.date.created | 2012-12-24 | - |
dc.date.created | 2012-12-24 | - |
dc.date.issued | 2012-12 | - |
dc.identifier.citation | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, v.73, no.12, pp.1542 - 1545 | - |
dc.identifier.issn | 0022-3697 | - |
dc.identifier.uri | http://hdl.handle.net/10203/102812 | - |
dc.description.abstract | HZSM-5 used to be the main catalyst component for the MTG process of Exxonmobil Co. Catalyst deactivation by coke in methanol-to-hydrocarbon (MTH) over HZSM-5 was studied in a fixed-bed reactor by observing the activity and selectivity with time-on-stream at 500 degrees C and WHSV=4.25 h(-1). The HZSM-5 with SiO2/Al2O3 ratios of 40 and 280 were synthesized and characterized with XRD. N-2 adsorption/desorption and NH3-TPD. The used catalysts were investigated by N-2 adsorption/desorption, XRD, elemental analysis (EA) and UV-vis spectroscopy to identify the nature of coke. If the acidity of HZSM-5 is low (SiO2/Al2O3=280), the coke deposited is mainly mono- or bi-aromatic which did not affect the catalyst activity significantly. On the other hand when the acidity is high (SiO2/Al2O3=40), the coke deposited is polycyclic aromatics with 3 or 4 fused rings which leads to significant deactivation after 24 h. It is presumed that the coke on the HZSM-5 with low acidity must be located inside the pores and/or in the framework, since the coke particles without polycyclic aromatics should be small. The deactivation of HZSM-5 with high acidity is mainly caused by the bulky coke molecules, most probably inducing the topological blocking of the zeolite pores and channels. (C) 2012 Elsevier Ltd. All rights reserved. | - |
dc.language | English | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.subject | ZEOLITE ZSM-5 | - |
dc.subject | MESOPOROSITY | - |
dc.subject | SELECTIVITY | - |
dc.subject | PROPYLENE | - |
dc.subject | STABILITY | - |
dc.subject | H-ZSM-5 | - |
dc.subject | ACIDITY | - |
dc.subject | SHAPE | - |
dc.title | Deactivation by coke deposition on the HZSM-5 catalysts in the methanol-to-hydrocarbon conversion | - |
dc.type | Article | - |
dc.identifier.wosid | 000310925900034 | - |
dc.identifier.scopusid | 2-s2.0-84867581048 | - |
dc.type.rims | ART | - |
dc.citation.volume | 73 | - |
dc.citation.issue | 12 | - |
dc.citation.beginningpage | 1542 | - |
dc.citation.endingpage | 1545 | - |
dc.citation.publicationname | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | - |
dc.identifier.doi | 10.1016/j.jpcs.2012.09.005 | - |
dc.contributor.localauthor | Ihm, Son-Ki | - |
dc.type.journalArticle | Article; Proceedings Paper | - |
dc.subject.keywordAuthor | Inorganic compounds | - |
dc.subject.keywordAuthor | Microporous materials | - |
dc.subject.keywordAuthor | Chemical synthesis | - |
dc.subject.keywordPlus | ZEOLITE ZSM-5 | - |
dc.subject.keywordPlus | MESOPOROSITY | - |
dc.subject.keywordPlus | SELECTIVITY | - |
dc.subject.keywordPlus | PROPYLENE | - |
dc.subject.keywordPlus | STABILITY | - |
dc.subject.keywordPlus | H-ZSM-5 | - |
dc.subject.keywordPlus | ACIDITY | - |
dc.subject.keywordPlus | SHAPE | - |
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