n-Octyl alcohol dehydrogenation over copper catalysts

Physico-chemical and catalytic properties of Mg–Al hydrotalcite and Mg–Al mixed oxide supported copper catalysts

“…Similarly, copper nanoparticles supported on MgO also showed significant activity for primary alcohol (1-octanol) dehydrogenation in presence of styrene as hydrogen acceptor [7,8]. The H 2 reduced Al-Cu-Mg mixed oxides derived from hydrotalcite (HT) type materials with different Cu:Mg:Al ratios showed high activity for dehydrogenation of 2-octanol [28]. However, the reported catalysts possess high copper content and were used in the reduced form (after thermal treatment in flow of H 2 ) to have dehydrogenation activity in the catalyst.…”

“…The commercial copper oxide gave 96% conversion of benzyl alcohol with 25% selectivity towards benzaldehyde along with formation of benzyl benzoate (51%), toluene (2%), benzoic acid (13%) and di-benzyl ether (9%). The basic supports (hydrotalcite and its derived mixed oxide) have been reported to be suitable support for copper to promote its catalytic activity for dehydrogenation reactions [5][6][7][8]17,18,[26][27][28]. To avoid the by-products formation (or acid catalyzed reactions) during alcohol dehydrogenation, the use of basic supports like MgAl hydrotalcite and its mixed oxides derived form could be best alternative to enhance the selectivity towards dehydrogenation reaction.…”

“…The LDH's and their mixed oxides containing reducible cation (e.g. copper ions) after reduction in flow of H 2 produce well dispersed metal particles in strong interaction with the support [1,[6][7][8]27,28]. The hydrotalcite supported copper nanoparticle catalysts have been reported as an efficient heterogeneous catalyst for oxidant-free dehydrogenation of alcohols and lactonization of diols [6,27].…”

“…The basic supports such as MgO and its mixed oxides (e.g. Cr 2 O 3 /MgO), different hydrotalcites and their derived mixed oxides have received great attention in recent years as an appropriate support for copper [5][6][7][8]17,18,[26][27][28]. The copper nanoparticles supported on these basic supports were reported to be highly active for catalytic transformation of alcohols (dehydrogenation, lactonization of diols, coupled dehydrogenation-hydrogenation, transfer dehydrogenation, etc.)…”

The direct transformation of ethanol to ethyl acetate over Cu/SiO 2 catalysts that contain copper phyllosilicate

“…They proposed that both the degree of dispersion and the metallic surface area of the copper were important during the selection of the most active catalyst. Crivello et al 41 investigated the reaction of n-octyl alcohol dehydrogenation over copper catalysts, and the Cu 0 sites were discovered to be the active ones. The addition of magnesium into copper catalyst increased its stability and dispersion.…”