Modified zeolite catalyst for selective dialkylation of naphthalene

Hdl Handle:
http://hdl.handle.net/10149/594503
Title:
Modified zeolite catalyst for selective dialkylation of naphthalene
Authors:
Hajimirzaee, S. (Saeed); Leeke, G. A. (Gary A.); Wood, J. (Joseph)
Affiliation:
Teesside University. Technology Futures Institute.
Citation:
Hajimirzaee, S., Leeke, G. A., Wood, J. (2012) 'Modified zeolite catalyst for selective dialkylation of naphthalene' Chemical Engineering Journal; 207-208:329-341.
Publisher:
Elsevier
Journal:
Chemical Engineering Journal
Issue Date:
Oct-2012 ; 7-Jul-2012
URI:
http://hdl.handle.net/10149/594503
DOI:
10.1016/j.cej.2012.06.134
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S1385894712008649
Abstract:
The dialkylation of naphthalene with isopropanol to produce 2,6-diisopropylnaphthalene (2,6-DIPN) was carried out over HY zeolite. The effects of various reaction conditions, such as pressure, temperature, space velocity, molar ratio of alcohol to naphthalene and time on stream (TOS) on product distribution were studied. HY zeolite was modified by transition metals, such as Fe3+, Ni2+, Co2+ and Cu2+ using wet impregnation method to maximize the selectivity to 2,6-DIPN. The catalysts were characterized by XRF, XRD, TGA, nitrogen adsorption–desorption and Temperature Programmed Desorption (TPD) of t-Butylamine. Under optimum reaction conditions, (50 bar, 220 °C, isopropanol/naphthalene = 4 (mole ratio), WHSV = 18.8 h−1, TOS 6 h), HY zeolite modified by Fe3+ was found to give the highest selectivity, by increasing the 2,6/2,7-DIPN ratio from 2.8 to 6.6. The experimental results indicate that the selectivity to 2,6-DIPN is in the order of Fe–HY > Ni–HY > Cu–HY > Co–HY > HY. Naphthalene conversion of 77% was obtained over HY zeolite, while after modification by Fe, Co, Ni and Cu, the conversion was changed to 73%, 76%, 88% and 96%, respectively. TPD result indicates different distribution of weak, medium and strong acid sites in the modified catalysts. TGA analysis of used catalyst samples revealed that a higher amount of PIPN was produced on zeolite modified by Co and Cu. This confirms that PIPN molecules are possible coke precursors, and therefore led to larger amount of coking on the Co–HY and Cu–HY catalysts.
Type:
Meetings and Proceedings
Language:
en
Keywords:
Dialkylation; Isopropylation; Naphthalene; HY zeolite; Wet impregnation
ISSN:
13858947
Rights:
Following 12 month embargo author can archive post-print (ie final draft post-refereeing). Creative Commons Attribution Non-Commercial No Derivatives License. For full details see http://www.sherpa.ac.uk/romeo [Accessed: 21/01/2016]

Full metadata record

DC FieldValue Language
dc.contributor.authorHajimirzaee, S. (Saeed)en
dc.contributor.authorLeeke, G. A. (Gary A.)en
dc.contributor.authorWood, J. (Joseph)en
dc.date.accessioned2016-01-21T15:26:17Zen
dc.date.available2016-01-21T15:26:17Zen
dc.date.issued2012-10en
dc.date.issued2012-07-07en
dc.identifier.citationChemical Engineering Journal; 207-208:329–341en
dc.identifier.issn13858947en
dc.identifier.doi10.1016/j.cej.2012.06.134en
dc.identifier.urihttp://hdl.handle.net/10149/594503en
dc.description.abstractThe dialkylation of naphthalene with isopropanol to produce 2,6-diisopropylnaphthalene (2,6-DIPN) was carried out over HY zeolite. The effects of various reaction conditions, such as pressure, temperature, space velocity, molar ratio of alcohol to naphthalene and time on stream (TOS) on product distribution were studied. HY zeolite was modified by transition metals, such as Fe3+, Ni2+, Co2+ and Cu2+ using wet impregnation method to maximize the selectivity to 2,6-DIPN. The catalysts were characterized by XRF, XRD, TGA, nitrogen adsorption–desorption and Temperature Programmed Desorption (TPD) of t-Butylamine. Under optimum reaction conditions, (50 bar, 220 °C, isopropanol/naphthalene = 4 (mole ratio), WHSV = 18.8 h−1, TOS 6 h), HY zeolite modified by Fe3+ was found to give the highest selectivity, by increasing the 2,6/2,7-DIPN ratio from 2.8 to 6.6. The experimental results indicate that the selectivity to 2,6-DIPN is in the order of Fe–HY > Ni–HY > Cu–HY > Co–HY > HY. Naphthalene conversion of 77% was obtained over HY zeolite, while after modification by Fe, Co, Ni and Cu, the conversion was changed to 73%, 76%, 88% and 96%, respectively. TPD result indicates different distribution of weak, medium and strong acid sites in the modified catalysts. TGA analysis of used catalyst samples revealed that a higher amount of PIPN was produced on zeolite modified by Co and Cu. This confirms that PIPN molecules are possible coke precursors, and therefore led to larger amount of coking on the Co–HY and Cu–HY catalysts.en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S1385894712008649en
dc.rightsFollowing 12 month embargo author can archive post-print (ie final draft post-refereeing). Creative Commons Attribution Non-Commercial No Derivatives License. For full details see http://www.sherpa.ac.uk/romeo [Accessed: 21/01/2016]en
dc.subjectDialkylationen
dc.subjectIsopropylationen
dc.subjectNaphthaleneen
dc.subjectHY zeoliteen
dc.subjectWet impregnationen
dc.titleModified zeolite catalyst for selective dialkylation of naphthaleneen
dc.typeMeetings and Proceedingsen
dc.contributor.departmentTeesside University. Technology Futures Institute.en
dc.identifier.journalChemical Engineering Journalen
or.citation.harvardHajimirzaee, S., Leeke, G. A., Wood, J. (2012) 'Modified zeolite catalyst for selective dialkylation of naphthalene' Chemical Engineering Journal; 207-208:329-341.en
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