Ecofriendly Palladium on Wool Nanocatalysts for Cyclohexene Hydrogenation

Abstract

Use of natural wool fiber supports in the fabrication of novel composite materials incorporating metal nanoparticles, which offer the possibility of “environmentally friendly” catalytic materials, has been investigated. The catalytic hydrogenation of cyclohexene to cyclohexane by palladium nanoparticles immobilized on wool (Pd/wool) was studied using moderate pressure of pure hydrogen gas. The performance of wool-supported catalysts was explored over a palladium nanoparticle loading ranging from 1.6 to 2.6 wt %. The effect of the catalytic testing conditions, including stirring rate, amount of reactants, gas pressure, and target temperature were explored. A systematic series of catalytic-activity tests carried out at 400 psi H2 for 5 and 24 h reaction times at 40 °C using a stirring rate 750 rpm allowed us to identify differences in performance within the series of Pd/wool nanocatalysts studied. The most catalytically active samples contained Pd nanoparticles with average sizes of ca. 5 nm located predominantly on the surface and within the topmost layer of wool fibers, making them more accessible to the reactants.

Easily Applicable Heterogeneous Catalyst from Sustainable Resources: Anchoring of Pd Nanoparticles onto Chemically Poly(2-amino thiophenol)-Modified Wool Fabrics

“…Among them, thanks to possessing various functional groups that are available to coordinate with the metal cations, maintaining a rigid structure hindering the solubility or disintegration in the different solvents, and being environmentally sustainable and always easily accessible, the wool fibers/fabrics can be considered as useful supports for catalyst materials. There have been a lot of studies involving the preparation of the wool–Pd complex and its use as a synthetic organic catalyst in the literature. ,,− To our knowledge, no report has been published on the reduction of nitroaromatic compounds using chemically surface-modified wool and PdNPs.…”

Rhodium Nanoparticles Incorporated Mesoporous Silica as an Active Catalyst for Cyclohexene Hydrogenation under Ambient Conditions

“…Oliveira et al [12] used cellulose acetate membranes to support palladium and rhodium nanoparticles, and the prepared catalysts exhibited a high activity in cyclohexene hydrogenation. Moreover, Ghadamgahi et al [13] reported recently the use of palladium nanoparticles supported on wool in the hydrogenation of cyclohexene under elevated temperature and pressure. On the other hand, mesoporous silica materials were applied to support the different noble metal nanoparticles because of their high stability under high pressure and temperature, in addition to their high surface area and wide pore volume.…”

Identification of PdPt alloys for preferential C6 olefin hydrogenation over aromatic hydrocarbons through density functional theory and microkinetic modeling

“…Recently, many reports have focused on C 6 olefin hydrogenation over Pd-based catalysts. 9–11 For example, Paris et al 9 prepared eco-friendly Pd on wool catalysts for cyclohexene hydrogenation, and found that the smaller nanoparticles and higher accessibility of the reactants to Pd were beneficial to the catalytic activity. Shen's group 10 displayed the effects of surface functional groups on hexene hydrogenation over Pd supported N-containing carbon supports.…”