Role of Lewis acidity in the isomerization of n-pentane and o-xylene on dealuminated H-mordenites

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1994.1360· OSTI ID:49055

Hong, Y; Gruver, V; Fripiat, J J ^[1]

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1. Univ. of Wisconsin, Milwaukee, WI (United States)

n-Pentane and o-xylene isomerizations have been studied at 285 and 150{degrees}C, respectively, on seven dealuminated H-mordenites containing different amounts of framework and nonframework aluminum which were prepared by steaming or calcining NH{sub 4}-mordenite. The number of Bronsted and Lewis sites were known beforehand from {sup 29}Si high-resolution magnetic resonance and infrared study of low-temperature CO adsorption. In addition, the availability of the acid sites to the reactants was estimated from the ratios of the liquid monolayer volume of the reactant (n-pentane or o-xylene) to that of N{sub 2}, the availability of the active sites to N{sub 2} and CO being the same. A synergistic enhancement of the acidity by the interaction between Bronsted and Lewis acid centers is suggested. Other aspects related with the product distribution are also discussed. 32 refs., 9 figs., 5 tabs.

• OSTI ID: 49055
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 150; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
40 CHEMISTRY
CATALYTIC EFFECTS
ISOMERIZATION
LEWIS ACIDS
PENTANE
XYLENES
ZEOLITES