Catalyst’s Sulfur Displacement by Thiophene, as Monitored by Exchange of 35S Radiotracer |
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Authors: | Pál Tétényi Tamás Koltai |
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Affiliation: | (1) Institute of Isotopes of the Hungarian Academy of Sciences, H-1525 77, Budapest, Hungary |
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Abstract: | The isotopic exchange has been studied between catalyst radiosulfur and H2S, formed in thiophene hydrodesulfurization (HDS) (named S-displace) on alumina supported molybdena, on CoMoOx, PdMoOx, PtMoOx and on silica–alumina supported NiWOx. S-displace was compared with radiosulfur exchange data between catalyst radiosulfur and gas phase H2S (Sexc) determined previously. The extent of Sexc was higher than that of the S-displace for Mo, CoMo in and NiW, whereas the extent of S-displace from PdMoO and PtMoO was
significantly higher, than that of Sexc. Thiophene HDS product distribution data are discussed in terms of increased C=C hydrogenation and C–C hydrogenolysis activity,
explained by increasing H2S production with longer circulation time of the thiophene/H2 mixture, The C1/C3<1 ratios among C4-hydrogenolysis products indicate some coke formation. The decrease of thiophene HDS activity is presumably a consequence
of increasing site-blocking with the formation of more H2S and coke with longer duration of thiophene treatment. |
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Keywords: | sulfur exchange thiophene hydrodesulfurization coke formation MoOx CoMoOx PdMoOx PtMoOx NiWOx |
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