Role of Lewis acidity in the isomerization of n-pentane and o-xylene on dealuminated H-mordenites
- 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
Similar Records
The effect of nonframework aluminum on acidity in dealuminated mordenite
Lewis acid sites surface aluminum and mordenites. An infrared study of CO chemisorption