Optimization of continuous synthesis of high purity carbon nanotubes (CNTs) using chemical vapour deposition (CVD) method was studied experimentally and theoretically. Iron pentacarbonyl (Fe(CO)5), acetylene (C2H...

Palladium catalysts were obtained by the adsorption method involving sequential deposition of polyvinylpyrrolidone (PVP) and then palladium ions on a modified zinc oxide surface without high-temperature calcination reduction stages. The immobilized PVP-palladium characterized scanning electron microscopy (SEM), transmission (TEM), Brunauer–Emmett–Teller (BET), infrared spectroscopy (IRS), X-ray...

A carboxy-directed asymmetric hydrogenation of α-alkyl-α-aryl terminal olefins was developed by using a chiral spiro iridium catalyst, providing a highly efficient approach to the compounds with a chiral benzylmethyl center. The carboxy-directed hydrogenation prohibited the isomerization of the terminal olefins, and realized the chemoselective hydrogenation of various dienes. The concise enanti...

Kinetic studies reported here have shown that acetylene is a potent reversible inhibitor of reductive dehalogenation of trichloroethene (TCE) and vinyl chloride (VC) by a mixed dehalogenating anaerobic culture. The mixed culture was enriched from a contaminated site in Corvallis, OR, and exhibited methanogenic, acetogenic, and reductive dehalogenation activities. The H2-fed culture transformed ...

The ethylene hydrogenation activity is compared for molybdenum oxycarbides, molybdenum carbides and a molybdenum alloy formed by reaction of molybdenum hexacarbonyl with alumina in ultrahigh vacuum using temperature-programmed desorption. It is found that molybdenum oxycarbides are inactive for ethylene hydrogenation. It is shown by forming carbides by reaction between alumina and ethylene that...

Acetylene reduction activity of intact rice plants was measured in closed assay chambers with plants grown in water culture. Acetylene was added to the liquid medium, and the ethylene formed was measured from both gas and liquid phases. After cutoff of mineral nitrogen supply and inoculation of fresh soil, rice plants grown from the seedling stage in water culture exhibited acetylene reduction ...

Abstract Parahydrogen-induced polarization is a hyperpolarization method for enhancing nuclear magnetic resonance signals by chemical reactions/interactions involving the para spin isomer of hydrogen gas. This has allowed biomolecules to be hyperpolarized such level that they can used real time in vivo metabolic imaging. One particularly promising example fumarate, which rapidly and efficiently...

Since nanoscale gold was first discovered to be catalytically active, gold-based catalysts have been studied both theoretically and experimentally in a wide range of reactions. These catalysts exhibit high activity for hydrogenation processes, in particular showing enhanced selectivity. However, there is a lack of relevant fundamental studies into these processes. Conducting hydrogenation react...

The inhibition effects and mechanisms of chlorinated methane and acetylene on methanogenesis in the anaerobic digestion process of the biodegradable wastes were investigated. It was found that both chloroform and acetylene could effectively inhibit methanogens while the biodegradability of the wastes was not affected. Acetylene inhibited the activity of methanogens, while chloroform inhibited m...

Acetylene cyclotrimerization catalyzed by palladium has been shown to proceed via the initial rapid formation of a C 4 H 4 species. This can either react with adsorbed acetylene to form benzene or alternatively, as has been recently suggested, it can dimerize forming cyclooctatetraene which decomposes to yield benzene. Trimerization is sufficiently fast that reaction is desorption rather than s...