dc.creatorBaronetti, Graciela Teresita
dc.creatorThomas, Horacio Jorge
dc.creatorQuerini, Carlos Alberto
dc.date.accessioned2018-05-08T15:07:36Z
dc.date.accessioned2018-11-06T11:27:36Z
dc.date.available2018-05-08T15:07:36Z
dc.date.available2018-11-06T11:27:36Z
dc.date.created2018-05-08T15:07:36Z
dc.date.issued2001-09
dc.identifierBaronetti, Graciela Teresita; Thomas, Horacio Jorge; Querini, Carlos Alberto; Wells–Dawson heteropolyacid supported on silica: isobutane alkylation with C4 olefins; Elsevier Science; Applied Catalysis A: General; 217; 1-2; 9-2001; 131-141
dc.identifier0926-860X
dc.identifierhttp://hdl.handle.net/11336/44417
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1852333
dc.description.abstractThe alkylation of isobutane with C4 olefins is studied, using heteropolyacids (HPA) with Wells–Dawson (WD) structure supported on silica (WD/SiO2). The catalytic performance of these catalysts is compared with a lanthanum-exchanged Y-zeolite catalyst. The loading of the HPA on silica was varied between 9 and 28 wt.%. These catalysts have activity for trimethylpentanes (TMP) production. The selectivity towards these products is not as high as in the case of the lanthanum containing Y-zeolite. The acidity of WD/SiO2 catalysts increases as the loading increases, as seen by MAS-NMR. Correspondingly, a better TMP production is observed. The increase both in acidity and in the TMP production as a function of the WD content is more noticeable at low loading. The coke formed during the reaction requires high temperatures, 550°C approximately, in order to be fully removed with an oxygen containing carrier gas. The temperature-programmed oxidation (TPO) profile of this coke displays two peaks, the first one between 80 and 300°C associated with hydrocarbons that are released upon heating, and the second between 300 and 550°C, associated with coke that changed its structure during the heating. A regeneration at intermediate temperatures, e.g. 300°C, removes the coke that corresponds to the first peak, but does not restore the initial activity. If the regeneration is carried out at higher temperatures, e.g. 500°C, most of the coke is removed, but this treatment leads to changes in the structure of the HPA, as indicated by FTIR and MAS-NMR analysis. Regeneration with O3 at low temperature (125°C) is effective both for coke removal and to recover the catalytic activity.
dc.languageeng
dc.publisherElsevier Science
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/S0926-860X(01)00576-2
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X01005762
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectIsobutane alkylation
dc.subjectHeteropolyacids
dc.subjectWells-Dawson
dc.subjectRegeneration
dc.titleWells–Dawson heteropolyacid supported on silica: isobutane alkylation with C4 olefins
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


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