Percorrer por autor "Samant, Purnakala"
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- Carbon nanotubes and xerogels as supports of well dispersed Pt catalysts for environmental applicationsPublication . Gomes, Helder; Samant, Purnakala; Serp, Philippe; Kalck, Philippe; Figueiredo, José; Faria, JoaquimDifferent types of carbon materials including multi-walled nanotubes (MWNT), carbon xerogels (CX) and activated carbon (AC) were used as supports to prepare platinum catalysts (1% w/w), which were tested in the treatment of aqueous aniline solutions by catalytic wet air oxidation (CWAO). The prepared materials and catalysts were characterized by several techniques (SEM/EDS, TEM, N2 adsorption, TPD and H2 chemisorption). All catalysts presented a very high activity for the removal of aniline and total organic carbon (TOC). Catalyst activity and selectivity toward CO2 formation were found to depend on the nature of the support and concentration of oxygen containing functional groups on the surface of the materials.
- Catalisadores de platina suportada em materiais de carbono com diferentes propriedades de adsorçãoPublication . Gomes, Helder; Samant, Purnakala; Serp, Philippe; Kalck, Philippe; Figueiredo, José; Faria, Joaquim
- Oxidação catalítica por via húmida da anilina sobre catalisadores de platina suportada em diferentes materiais de carbonoPublication . Gomes, Helder; Samant, Purnakala; Serp, Philippe; Figueiredo, José; Faria, Joaquim
- Preparation of highly mesoporous carbon catalysts for wet oxidation of anilinePublication . Samant, Purnakala; Gomes, Helder; Figueiredo, José; Faria, JoaquimCarbon xerogels were synthesized from different organic precursors in order to obtain materials with high surface area and well developed mesoporosity. In addition, oxygen surface groups were introduced on these materials by proper chemical or thermal treatments. In a previous work [1] we have shown that mesoporous carbon xerogels with proper surface chemistry could be efficiently applied in wet oxidation reactions. In this work, the xerogels synthesized by poly-condensation from the organic precursors resorcinol/formaldehyde (CX) and resorcinol/cresol/formaldehyde (CCX) were used as catalysts in the wet oxidation of aniline. The reaction was carried out at 200ºC and 20 bar of oxygen partial pressure.