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- W2039974413 abstract "Abstract The aromatization of n-heptane on Pt-containing reforming catalysts was significantly enhanced in either nitrogen alone or nitrogen-containing diluent gas. This study was carried out on fresh Pt– and Pt–Re/Al 2 O 3 catalysts in a microcatalytic reactor at temperatures between 420 and 500°C, W/F between 0.83 and 3.75 mg min −1 ml −1 and at a total pressure of 3.92 bar. These studies were complimented with others on a decaying Pt/Al 2 O 3 catalyst. Results obtained suggest fundamental differences between the two catalysts and also with the choice of carrier gas. On Pt/Al 2 O 3 catalyst in N 2 carrier, aromatization with complete demethylation is obtained at all temperatures, except at 420°C where demethylation is found to be incomplete. In contrast, in H 2 carrier, demethylation is negligible on the Pt/Al 2 O 3 catalyst. With the Pt–Re/Al 2 O 3 catalyst, reaction in H 2 predominantly produces methane while reaction in N 2 appears to impart intrinsic aromaticity to the bimetallic catalyst albeit with an attenuation of the overall activity. In H 2 –N 2 mixtures, demethylation activity seems to decrease with increasing H 2 content on Pt/Al 2 O 3 catalyst and found to be quite low at 50% H 2 . The threshold of the introduction of intrinsic aromaticity on the Pt–Re/Al 2 O 3 was found to occur at 50% N 2 ; below this value, the bimetallic catalyst reverts to a complete cracking catalyst. The aromatization on a deactivating Pt/Al 2 O 3 catalyst was successfully modeled with first order reaction and deactivation rates." @default.
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- W2039974413 date "1999-05-01" @default.
- W2039974413 modified "2023-09-27" @default.
- W2039974413 title "Nitrogen influence on aromatic selectivity during n-heptane reforming on fresh and deactivating platinum/alumina and platinum–rhenium/alumina catalysts" @default.
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- W2039974413 doi "https://doi.org/10.1016/s0255-2701(98)00081-6" @default.
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