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tert-Butylation of naphthalene by tertiary butanol over HY zeolite and cerium-modified HY catalysts

Abstract

tert-Butylation of naphthalene is a promising process for the production of 2,6-DANs, fundamental starting materials for PEN. Herein, the tert-butylation of naphthalene with tertiary butanol was carried out in liquid phase over a series of Ce modified HY zeolites. XRD, SEM, TEM, XPS, NH3-TPD and FT-IR characterization studies proved that the Ce species dispersed uniformly on the HY zeolite in the form of small cerium oxide clusters/nanoparticles. The formed Ce2O3 and CeO2 interacted with the hydroxyl groups in the zeolite, which caused the passivation of the silicon-aluminium bridge hydroxyl groups in the supercages and sodalite cages, resulting in the decrease of acid concentration and acid strength. Due to the weakened acid strength, the selectivity of 2,6-DTBN in the pores was greatly enhanced. Moreover, the non-selective acid sites on the external surface were reduced by Ce modification, which effectively inhibited the dealkylation and isomerization reactions thus helped to maintain the high selectivity of 2,6-DTBN.

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Publication details

The article was received on 19 Jun 2017, accepted on 12 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7CY01227F
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    tert-Butylation of naphthalene by tertiary butanol over HY zeolite and cerium-modified HY catalysts

    Z. H. Huang, J. Zhang, P. Li, L. Xu, X. Zhang, Y. Yuan and L. Xu, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01227F

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