Selective formation 2,6-diisopropyl naphthalene over mesoporous Al-MCM-48 catalysts

Krithiga, T., Vinu, A., Ariga, K., Arabindoo, B., Palanichamy, M. and Murugesan, V. (2005) Selective formation 2,6-diisopropyl naphthalene over mesoporous Al-MCM-48 catalysts. Journal of Molecular Catalysis A-Chemical, 237 1-2: 238-245. doi:10.1016/j.molcata.2005.05.008

Author Krithiga, T.
Vinu, A.
Ariga, K.
Arabindoo, B.
Palanichamy, M.
Murugesan, V.
Title Selective formation 2,6-diisopropyl naphthalene over mesoporous Al-MCM-48 catalysts
Journal name Journal of Molecular Catalysis A-Chemical   Check publisher's open access policy
ISSN 1381-1169
Publication date 2005-08
Sub-type Article (original research)
DOI 10.1016/j.molcata.2005.05.008
Volume 237
Issue 1-2
Start page 238
End page 245
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
The protonated cubic mesoporous aluminosilicate (Al-MCM-48) molecular sieves have been synthesized hydrothermally and characterized by powder X-ray diffraction (XRD), nitrogen adsorption studies, thermogravimetric analysis (TGA) and solid-state 29Si and 27Al MAS NMR spectroscopy. The XRD patterns and nitrogen adsorption results reveal the cubic structural order and the mesoporous nature of the catalysts. 27Al MAS NMR spectra demonstrate that most of the Al is incorporated in the framework in tetrahedral coordination. Acidity measurement by pyridine-adsorbed FT-IR spectroscopy reveals that the incorporation of Al in the framework imparts substantial Brönsted acidity, which increases with increase in metal content. Lewis acidity is probably generated by extra-framework Al species. Vapour phase isopropylation of naphthalene (NAP) with isopropyl alcohol (IPA) was carried out over H-form of Al-MCM-48 catalysts with different n Si/n Al ratios. The feed molar ratio of 1:2:10 (NAP:IPA:CYH) and WHSV (5.36 h -1) were found to be the optimized conditions for good NAP conversion with selectivity of 2,6-diisopropylnaphthalene (2,6-DIPN). The effect of 2,6/2,7-DIPN ratio was also studied for catalysts with various n Si/n Al ratios and at different temperatures. Among the catalysts used in the present study, AlMCM-48 (25) showed a high NAP conversion and selectivity to 2,6-DIPN under the optimized reaction conditions.
Keyword Mesoporous
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
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