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Multiwalled carbon nanotube (MWCNT) samples were obtained by purification and ball-milling of a MWCNT sample synthesized by catalytic chemical vapor decomposition. These samples were oxidized with KMnO 4 –H 2 SO 4 solution. A heat treatment was employed to decompose the oxygenated groups created by the oxidation treatment. The samples were characterized by transmission electron...
Carbon-based catalytic briquettes have been prepared for the reduction of NO in the presence of NH 3 at low temperatures (100–250°C). In general terms, the reduction efficiency is promoted by an increase in the support porosity, and especially, by an oxidizing treatment prior to the impregnation. The apparent rate constants for the catalytic briquettes doped with the ashes of a petroleum coke...
A series of activated carbons (ACs) with progressively changing nanotextural characteristics was obtained by heat-treatment of a bituminous coal at temperatures ranging from 520 to 1000°C, and subsequent activation by KOH at 700°C or 800°C. As the pre-treatment temperature increases, the total pore volume V T decreases from 1.28 to 0.30cm 3 g −1 , and the BET specific surface...
Carbon-coated monoliths were prepared from polyfurfuryl alcohol coated cordierite structures obtained by dip-coating. In this way, thin, homogeneous, consistent and good adhered carbon layers were obtained. The different steps followed in the preparation of these catalyst supports were studied by scanning electron microscopy. Pd and Pt catalysts were prepared by equilibrium impregnation of the monolithic...
Chemical and electrochemical techniques have been used in order to asses surface functionalities of porous carbon materials. An anthracite has been chemically activated using both KOH and NaOH as activating agents. As a result, activated carbons with high micropore volume (higher than 1cm 3 /g) have been obtained. These samples were oxidized with HNO 3 and thermally treated in N ...
Lead(II) adsorption from an aqueous solution onto a graphene layer (Cπ electrons) was investigated using activated carbon and charcoal. The carbonaceous materials were treated by several steps to prepare ash free and acidic oxygen free graphite surface by washing with HCl and H 2 F 2 solution followed by out gassing at 1273K. Changes in Pb(II) adsorption capacity were checked at each...
Tunable carbon-coated monoliths as carriers for enzyme adsorption are presented. Depending on enzyme properties and reaction conditions, the carrier can be adjusted to optimize enzyme loading. Carbon–ceramic composites were prepared by sucrose carbonization, polyfurfuryl alcohol (PFA) carbonization, and by growth of carbon nanofibers (CNFs) over deposited Ni. All carbons were treated in air and subsequently...
The decomposition of aqueous ozone in the presence of various granular activated carbons (GAC) was studied. The variables investigated were GAC dose, presence of tert-butyl alcohol (TBA), aqueous pH as well as textural and chemistry surface properties of GAC. All the GAC tested enhanced the rate of ozone decomposition to some extent. From the analysis of experimental results it was deduced that ozone...
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