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Cited by 269 publications
(145 citation statements)
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“…Moreover, we note the presence of peaks at 437, 585 and 982 cm -1 characteristic of ZrO 2 [30]. The bands at 2846 and 2943 cm -1 correspond to organic residue [26]. Calcination at high temperature (650°C) does not seem to affect the environment of sulphate groups.…”
Section: Ftir Spectroscopymentioning
confidence: 94%
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“…Moreover, we note the presence of peaks at 437, 585 and 982 cm -1 characteristic of ZrO 2 [30]. The bands at 2846 and 2943 cm -1 correspond to organic residue [26]. Calcination at high temperature (650°C) does not seem to affect the environment of sulphate groups.…”
Section: Ftir Spectroscopymentioning
confidence: 94%
“…6, aerogel materials exhibit a wide peak centred at 3355 cm -1 attributed to the vibration of hydroxyl group of adsorbed water [25,26]. This band weakened after the calcination at 650°C.…”
Section: Ftir Spectroscopymentioning
confidence: 95%
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“…[39] More recently, Babou et al suggested that the surface sites on sulfated zirconia need small quantities of water to be active. [40] In line with those findings, Kobe et al reported that the addition of 75 mmol g À1 of water to a sulfated zirconia sample dehydrated at 500 8C largely restored its high catalytic activity in n-butane isomerization. [41] On the other hand, excessive catalyst hydration led to poor catalytic performance by causing extensive hydrogen bonding at the active sites.…”
Section: Discussionmentioning
confidence: 60%
“…The latter is closely related to the presence of acidic sites within the oxides matrices, and a commonly used method for promoting acidic properties of metal oxides is their enrichment with sulfate ions. Indeed, sulfate-promoted oxides of titanium and of zirconium are known for their catalytic activity for a large number of processes, such as isomerization of hydrocarbons, esterification and alkene polymerization (Arata 1996;Babou et al 1995;Chuah et al 1996;Hess and Kemnitz 1997;Stichert and Schuth 1998;Tran et al 1998;Vera et al 1998). Sulfated mixed zirconium and titanium oxides have been the subject of a number of investigations (Barthos et al 2000;Lonyi et al 1996;Miao et al 1996), and the presence of sulfate ions has been found to have a bearing on the surface and textural properties of these mixed oxides (Ramadan et al 2007).…”
Section: Introductionmentioning
confidence: 99%