Regular ArticleOn the Acid-Catalyzed Isomerization of Light Paraffins over a ZrO2/SO4 System: The Effect of Hydration
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Acidity-activity relationships in the solvent-free tert-butylation of phenol over sulfated metal oxides
2023, Applied Catalysis A: GeneralModeling of motor gasoline components complex production
2021, Catalysis TodayModification of silicalite-1 with ammonium compounds aimed at preparation of acidic catalyst for acetalization of glycerol with acetone
2019, Applied Catalysis A: GeneralCritical review on the active site structure of sulfated zirconia catalysts and prospects in fuel production
2019, Applied Catalysis A: GeneralCitation Excerpt :The authors of these studies observed that v(SO) mode in the dehydrated samples shift to below 1300 cm−1 after the introduction of water [66,71]. The lower frequency represented a weaker sulfate species covalently bonded to water [36,72]. Babou et al. adsorbed H2O, D2O and H218O on dehydrated SZ to investigate the effect of water [71].
Sulfuric acid functional zirconium (or aluminum) incorporated mesoporous MCM-48 solid acid catalysts for alkylation of phenol with tert-butyl alcohol
2014, Journal of Solid State ChemistryCitation Excerpt :The band at 1649 cm−1 may be attributed to surface silanol groups and adsorbed water molecules. Additionally, it can be seen that the four solid acid catalysts all exhibit the absorption band at ca. 1380 cm−1 corresponding to SO, which may be regarded as the characteristic band of SO42− in solid acid catalyst [32], suggesting that SO42− has been introduced into the mesoporous framework. The band at 1380 cm−1 is probably attributed to the interaction between SO42− and metallic element [33].
Olefin impurity effect on n-pentane bimolecular isomerization over WO <inf>x</inf>/ZrO<inf>2</inf>
2013, Catalysis CommunicationsCitation Excerpt :HPAs are very active but thermally unstable since they decompose at low temperatures (usually lower than 500 °C), which makes their regeneration virtually impossible in industrial applications. SZ has been studied extensively [12–20,22,24,25,37,39–45] for replacing current catalysts, especially for the isomerization of nC4. Even though more stable than Pt/Al2O3 and HPAs, SZ catalysts suffer by severe deactivation due to coke deposition [22] and H2S in situ generation [44,46] in the presence of H2O [46,47].