Reactions of benzyl alcohol and dibenzyl ether over zeolites

Reduction of benzaldehyde on alkaline earth metal oxides

“…In the absence of dihydrogen flow, hydrogen comes from surface hydroxyl or aldehydic groups. Sreekumar and Pillai [15] showed that toluene product is formed by disproportionation from benzyl alcohol:…”

“…Benzaldehyde is known to dissociatively adsorb as benzoate and benzylate species on basic oxides [2,20,21,36] and subsequent heating leads to the disproportionation to toluene [15], or to the decomposition of these species to benzene [20,[37][38].…”

“…It is well known that benzaldehyde is reduced to benzyl alcohol or toluene on metal oxides by two main process [2,6,15]: the first one seems to be the formation of the reduced compounds, at the absence of dihydrogen flow, by the Cannizzaro reaction accompanied by that of oxygenated products such as benzoate species and the active sites are mobile hydroxyl groups [2]. In the second process, the presence of dihydrogen flow provokes the direct hydrogenation of benzaldehyde.…”

Benzaldehyde reduction over Cu–Al–O bimetallic oxide catalyst. Influence of pH during hydrothermal synthesis on the structural and catalytic properties

“…(2)), followed by the reaction between benzylate species with benzaldehyde molecule (Eq. (3)), as suggested by Sreekumar and Pillai reaction [30].…”

“…The formation of toluene with 100% selectivity on CuAl-8, suggests that the benzylate species do not desorb and probably react directly by a new surface step to toluene [6,30]. A high pore volume with a small pore diameter (BJH method) observed for CuAl-8 compared to CuAl-12 could delay the desorption of the benzylate species and thereby inhibit the formation of benzyl alcohol.…”