dc.creator | Baronetti, Graciela Teresita | |
dc.creator | Thomas, Horacio Jorge | |
dc.creator | Querini, Carlos Alberto | |
dc.date.accessioned | 2018-05-08T15:07:36Z | |
dc.date.accessioned | 2018-11-06T11:27:36Z | |
dc.date.available | 2018-05-08T15:07:36Z | |
dc.date.available | 2018-11-06T11:27:36Z | |
dc.date.created | 2018-05-08T15:07:36Z | |
dc.date.issued | 2001-09 | |
dc.identifier | Baronetti, 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.identifier | 0926-860X | |
dc.identifier | http://hdl.handle.net/11336/44417 | |
dc.identifier | CONICET Digital | |
dc.identifier | CONICET | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1852333 | |
dc.description.abstract | The 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.language | eng | |
dc.publisher | Elsevier Science | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/S0926-860X(01)00576-2 | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X01005762 | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/restrictedAccess | |
dc.subject | Isobutane alkylation | |
dc.subject | Heteropolyacids | |
dc.subject | Wells-Dawson | |
dc.subject | Regeneration | |
dc.title | Wells–Dawson heteropolyacid supported on silica: isobutane alkylation with C4 olefins | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |