Catalytic transfer hydrogenation of oleic acid to octadecanol over magnetic recoverable cobalt catalysts

Abstract

Earth-abundant magnetic cobalt is highly efficient for CTH of oleic acid with isopropanol as a hydrogen donor, affording 100% conversion as well as 91.9% octadecanol yield at 200 °C, which can be ascribed to the synergistic effect between Coδ+ and Co0.

Catalytic Transfer Hydrogenation of Levulinic Acid to γ-Valerolactone over Ni3P-CePO4 Catalysts

“…The Lewis acid sites activated the carbonyl groups of LA, while the base sites were beneficial for the dissociation of hydroxyl groups in 2-propanol to form the active H adatom . The unsaturated carbonyl compounds are apt to bond strongly to metallic sites and interact with the adjacent adsorbed H species for hydrogenation. ,, The M–H + adducts could be formed, promoting the dehydrogenation of alcohols . Moreover, the acidic and basic sites could also enhance the esterification/lactonization reaction.…”

“…51 The unsaturated carbonyl compounds are apt to bond strongly to metallic sites and interact with the adjacent adsorbed H species for hydrogenation. 23,52,53 The M−H + adducts could be formed, promoting the dehydrogenation of alcohols. 54 Moreover, the acidic and basic sites could also enhance the esterification/ lactonization reaction.…”

“…The MPV reduction, a method of carbonyl group reduction using alcohols as hydrogen donors, can be operated at moderate reaction conditions. , Various catalysts based on noble metals, − transition metals, − metal complexes, , hydrotalcites, metal oxides and hydroxides, − and metal–organic hybrids have been investigated for MPV reduction. However, some inevitable disadvantages existed in these catalysts, for example, high expense of non-renewable raw materials, complicated preparation process, harsh reaction conditions (high temperature and long time), and low yield of desired products .…”

Cobalt–Alumina Coprecipitated Catalysts for Green Diesel Production

“…In order to explain these results, we consider that the most active sites for the slow steps of SDO are situated on the surface of Co 0 and the interfaces of Co 0 /CoO where sites with moderate acidity are also developed (NH 3 -TPD results). In this regard, Wang et al 45 identified synergy between Co 0 and Co δ+ species in hydrodeoxygenation reactions. Chen et al 46 proposed the development of active sites at the interfaces between Co 0 and CoO x species being responsible for higher alcohol synthesis from syngas.…”

Magnetically separable mesoporous silica‐supported palladium nanoparticle‐catalyzed selective hydrogenation of naphthalene to tetralin

“…Nano catalysts have attracted much attention owing to their high efficiency as well as the green features of the reaction processes free of ligands or additives . In field applications, magnetic materials, such as Fe 3 O 4 , have been widely used as the support for catalytic metal nanoparticles (NPs) to achieve convenient magnetic separation as they enable more efficient catalyst recovery process, compared with the traditional homogeneous or heterogeneous catalysts . However, aggregation of active metal NPs may result in catalyst deactivation and is a major issue hindering their industrial application.…”