Characterization of the acidity of zeolite Beta by FTi.r. spectroscopy and t.p.d. of NH3

Hydrogenation of methyl isobutyl ketone over bifunctional Pt–zeolite catalyst

“…The zeolites used, H-ZSM-5, H-Beta and H-Y, had close Si/Al atomic ratios (Si/ Al = 12-15) and hence comparable proton site densities. Their acid strength decreases in the order H-ZSM-5 > H-Beta > H-Y [14,15]. The Pt/zeolite catalysts had high crystallinity and exhibited standard XRD patterns of the corresponding zeolites.…”

Isopropylation of toluene: a comparative study of microporous zeolites and mesoporous MCM-41 materials

“…On the other hand, Venuto [18] in their study of alkylation of toluene with ethylene over rare earth exchanged X (REX) zeolites followed ortho and para substitution. Hegde et al [19] reported that the zeolite β has higher technical potential compared to the faujasite-type zeolites by virtue of its high silica content and acid site distribution. Due to the strong and higher acidic nature of zeolites, a rapid deactivation due to coke formation as well as side products were observed.…”

Cyclisation of (phenylthio)acetaldehyde diethylacetal in the presence of dealuminated beta zeolites: an unexpected Meerwein–Ponndorf–Verley reduction

“…Kiricsi et al [21] referred this VHF band to a transient aluminium species. Maache et al [22] and Hedge et al [23] described this band as ill-defined extraframework alumina-like species which were shown to be extractable by acid leaching. Beck and Haw [24] suggested that this peak is related to an unusual aluminium species associated with the framework.…”