Hydro-conversion of 1-methyl naphthalene into (alkyl)benzenes over alumina-coated USY zeolite-supported NiMoS catalysts

Fuel, Volume 90, Issue 1, January 2011, Pages 182-189

Hydro-conversion of 1-methyl naphthalene into (alkyl)benzenes over alumina-coated USY zeolite-supported NiMoS catalysts

Joo-Il Park (a), Jihn-Koo Lee (b), Jin Miyawaki (a), Young-Kwang Kim (a), Seong-Ho Yoon (a), Isao Mochida (a)

yoon@cm.kyushu-.ac.jp

a Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 816-8580, Japan

b 121 Bio-venture Center, Korea Research Institute of Bioscience and Biotechnology, 52 Eoun-dong, Yuseong-gu, Daejeon 305-806, Republic of Korea

Abstract

To study ring opening reactions of 1-methyl naphthalene using NiMoS supported on ?-alumina and alumina-coated/mixed USY zeolites hydro-conversion reactions were carried out at 360 °C under 5 MPa of H2 pressure.

The catalysts were characterized using N2 BET, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), pyridine FT-IR, and high-resolution transmission electron microscopy (HR-TEM) to study the influence of morphological and acidic properties on hydrogenation (HYD) and hydrocracking (HC) reactions. NMACZ-2 (NiMoS supported on the minimum amount of alumina-coated USY zeolite) showed enhanced reactivity for HC and produced (alkyl)benzenes with the highest yield, of ca. 80% ... A large amount of decalin was produced through the HYD of tetralin without significant cracking, possibly due to the weak acid character of ?-alumina. Bulk phase Mo oxide species on NMAZ (physical mixture of alumina and USY zeolite), as well as deactivation of the catalysts due to coke formation over the naked zeolite surface, inhibited the ring opening of tetralin, decreasing the yield of (alkyl)benzene.

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