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Matches in SemOpenAlex for { <https://semopenalex.org/work/W2004758978> ?p ?o ?g. }

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• W2004758978 abstract "This study examined the catalytic behavior of Ti02ZrO2 and the mechanism of n-paraffins dehydrocyclization. The results showed that TiO2-ZrO2 calcined at 823 K gave higher aromatic selectivity and activity than other catalysts calcined at higher temperatures. The activity can be poisoned by adding small amounts of K20 or B203 onto Ti02-ZrO2. The aromatization rate was correlated with the site density of the paired acid-base sites on the catalysts. The results indicated that the active centers consisted of both acid and base sites, and that only the paired acid-base sites played the primary role in the dehydrocyclization reaction. The results also showed that the apparent overall kinetics of n-heptane conversion was a first-order reaction. It was conclusively shown that the five-membered ring alkylcyclopentanes were not the intermediates in the transformation of n-paraffins into aromatics. The results showed that the n-paraffin was first adsorbed on the paired acid-base sites, and two hydrogen atoms were abstracted by the catalyst. Then the adsorbed molecules proceeded to cyclization through a direct six-membered ring closure without desorption, before dehydrogenation to aromatics." @default.
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• W2004758978 date "1991-08-01" @default.
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• W2004758978 title "Dehydrocyclization of C6$z.sbnd;C8 n-paraffins to aromatics over TiO2$z.sbnd;ZrO2 catalysts" @default.
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• W2004758978 doi "https://doi.org/10.1016/0021-9517(91)90137-s" @default.
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