Effect of Ce on catalytic properties of pillared montmorillonite with Al- and GaAl-polyoxications

From Microporous to Mesoporous Molecular Sieve Materials and Their Use in Catalysis

“…The possibility of making bifunctional Pt/PLS catalysts has been illustrated by using test reactions such as the hydroisomerization and hydrocracking of n -alkanes. − These studies, in general, showed that there is a direct correlation between the Brønsted acidity of the PLS and the hydroisomerization/ hydrocracking activity, and furthermore it is possible to achieve on these materials a good balance between hydrogenation−dehydrogenation and the cracking functions.…”

Enhanced Thermal Stability of Al-Pillared Smectites Modified with Ce and La

“…The presence of Ce in Al-pillared clays produces a substantial increase in the conversion of nheptane and in the selectivity towards cracking products owing to the increase in the number of acid centers (Hernando et aL, 1996). Montmorillonite saturated with lanthanides shows, upon heating, a decrease in cation-exchange capacity, which was partially attributed to the migration of the lanthanide ions to octahedral sites of the 2:1 layers (Poyato et al, 1987).…”

Green synthesis of bisphenol F over 12-phosphotungstic acid supported on acid-activated palygorskite

“…9 The acidity of the corresponding raw material is associated with the presence of structural hydroxyl groups in the layers (Brönsted acid sites) as well as to interlayer species, such as cations (Lewis acid sites). 10 What's more, the surface acid strength of raw clays can be tuned when they are subjected to acid treatments. These features of palygorskite are likely coming from its porous crystalline structure containing tetrahedral layers alloyed together by longitudinal sideline chains, 11 making it suitable for a phenol condensation reaction to release BPF.…”