Acid-catalysed benzene hydroconversion using various zeolites: Brönsted acidity, hydrogenation and side-reactions

Comment on: “Brønsted acidity of H-MCM-22 as probed by variable-temperature infrared spectroscopy of adsorbed CO and N2” by Delgado et al. [Catal. Today 227 (2014) 45–49]

“…This band may originate from a weak dealumination of the structure during the air calcination process, thus producing some extraframework aluminium species (EFALS) [2,3]. Such attribution is fully supported as other dealuminated zeolites also exhibit such 3670 cm −1 band [14,17,[22][23][24][25]. Although this weak band appears clearly in the H-MCM-22 of Delgado et al's sample (see the bold line blank spectrum in bottom inset of their Fig.…”

Hydroconversion of 1-methylnaphthalene over Pt/AlSBA-15–Al2O3 composite catalysts

“…Results obtained by Caironet al [65] with metal-free zeolites (cubic and hexagonal faujasites, steamed or not) clearly show that Brønsted acid sites are active in benzene hydrogenation although their hydrogenation activity is lower than that of metal sites.…”

Hydrotreating activity of bulk NiB alloy in model reaction of hydrodenitrogenation of carbazole

“…The acidic centres are worth mentioning as well (or perhaps the acidic-metal balance of centres) which participate in hydrogenation and HDN reactions but, first of all, in isomerisation [60,61].…”