1,720,961 research outputs found
Hybrid Materials for CO2 Up-take from Simulated Flue-gases: Xerogels Containing Diamines
No full textProduction of biodiesel from macroalgae by supercritical CO2 extraction and thermochemical liquefaction
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Angela Dibenedetto*, Marcella Narracci, Michele Aresta and Carlo Fragale “Reaction of silyl-mono and di-amines with carbon dioxide: evidence of formation of inter- and intra-molecular ammonium carbamates and their conversion into organic carbamates of industrial interest by trans-esterification of carbonates under carbon dioxide catalysis
No full textThermal desorption of polychlorobiphenyls from contaminated soils and their hydrodechlorination using Pd- and Rh-supported catalysts
No full textFirst in vitro use of phenylphospate carboxylase enzyme in supercritical CO2 for the selective carboxylation of phenol to 4-hydroxybenzoic acid
No full textNanomaterials as photocatalysts for the CO2 reduction to methanol in water
No full textCO2 can be converted into methanol, through the intermediate steps of reduction to formic acid and formaldehyde using a triad of enzymes such as formate dehydrogenase (FatoDH), formaldehyde dehydrogenase (FaldDH) and alcohol dehydrogenase (ADH).
In each reductive step one mole of NADH is oxidized to NAD+ that has to be converted back to NADH in order to make the process acceptable from an economic point of view. Such regeneration can be accomplished by chemical, electrochemical, photochemical or photoelectrochemical processes.
We have recently shown[1] that the photosystems can be coupled with the three enzymes listed above for the reduction of CO2 to methanol, using glycerol as H-donor. New photocatalysts have been prepared, such as: transition metal sulphides and nonstoichiometric mixed sulphides, composites of metal oxides like Cu2O/TiO2.
Here, we describe the behaviour of selected semiconductors and the working mechanism (electron injection in the conduction band or hole injection in the valence band) and show that they are interesting agents for the reduction of NAD+ and the regeneration of NADH
Converting wastes into added value products: from glycerol to glycerol carbonate, glycidol and epichlorohydrin using environmentally friendly synthetic routes
Full text linkGlycerol carbonate, synthesised via a non-phosgene route using glycerol and CO2 or urea in presence of a heterogeneous catalyst, was efficiently converted into a series of derivatives through the functionalization of the eOH moiety, using high yield, high selectivity synthetic routes not affecting the carbonate functionality. So, for example, glycerol carbonate was converted into epichlorohydrin, a product that has a large industrial application, under very mild conditions, using a two-step reaction with a 98% yield and 100% selectivity. The high yield and mild reaction conditions (very often close to the ambient conditions) make the environmentally friendly synthetic approach described in this work of potential applicative interest. All compounds prepared were fully characterized
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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