Plasma torch generation of carbon supported metal catalysts

Iron on Carbon Catalaysts for the Photocatalytic Degradation Orange II

“…Differences between oven and plasma Fe/catalysts are not only in the metal dispersion but also the oxidation states of iron, XRD profiles show that CO catalysts present mainly the characteristic peaks of Magnetite (Fe 3 O 4 ) finding iron as Fe 2+ and Fe 3+ ( Figure 6A), while CP catalysts show the presence of metallic Iron, which is in agreement with previous studies in which the high velocity of diffusion of the plasma process, allows the iron atoms to be adsorbed directly into the carbon surface avoiding them to interact and form other species (25). In order to identify if the oxidation state of iron was the main factor controlling catalysts performance, the iron/alumina oven treated catalyst AO was tested with H 2 O 2 .…”

“…The plasma procedure is a technique that uses a microwave plasma operated at atmospheric conditions to process the sample (23,25,26). This fabrication method is known to vaporize the precursors, as they are carried by a gas through the glow discharge zone of the plasma reactor where they reach very high temperatures (above 2000 o C) in only fractions of a second, and produce highly dispersed solids usually collected in the afterglow region.…”

“…Some catalysts were prepared by wet impregnation and others generated with a plasma technique (aerosol-through-plasma, A-T-P) and their activity compared. Plasma generated catalysts were included because of recent developments that suggest these catalysts are superior to those produced using standard incipient wetness (22)(23)(24)(25). The activity of both types of catalysts was studied in conventional thermal catalytic reactors and in photocatalytic reactors.…”

Thermal Plasma Synthesis of Nano-Sized Powders

“…Unlike MgO support, however, the in-flight heating of carbon injected with Pd metal resulted in the loss of carbon surface area due to the removal of all oxygen groups from carbon supports by plasma treatment. In addition, they also reported that mixture precursors consisting of PdAg metal and Al2O3 oxides leads to significant metal loss in as-prepared catalysts because of the burial of metal particles into Al2O3 pores during their plasma treatment [85][86]. Compared with the melting points of MgO (2,852 ºC) and Al2O3 (2,072 ºC), these results indicate that oxide supports with high melting points are favorable in the thermal plasma synthesis of supported metal catalysts without metal loss.…”

“…Instead of refractory oxide support, such as MgO, H. Zea et. al [85] have prepared carbon supported metal catalysts using a non-transferred DC plasma torch. Unlike MgO support, however, the in-flight heating of carbon injected with Pd metal resulted in the loss of carbon surface area due to the removal of all oxygen groups from carbon supports by plasma treatment.…”