Encontrados 3 documentos, a visualizar página 1 de 1
Characterization of the surface of activated carbons produced from tire residues
J.M. Valente Nabais; C. Laginhas; P.J.M. Carrott; M.M.L. Ribeiro Carrott; P.C. Galacho; J.E.C. Amorós; A.V.N. GisbertThe surface characterisation of new activated carbons produced from tire residues by activation with carbon dioxide was studied. The activated carbons produced were mainly basic with point of zero charge values above 8.8. The main surface functional groups identified by FTIR were ether, quinones, lactones, ketones, hydroxyls (free and phenol) and pyrones. The XRD analysis shows that the materials produced have ...
Structural characterisation and mechanical stability of titanium substituted me...
P.C. Galacho; M.M.L. Ribeiro Carrott; J. Valério; P.J.M. Carrott; J.M. Valente NabaisMesoporous silica and titanium SBA-15 samples with different Si/Ti molar ratio were prepared by direct one-step synthesis under strongly acidic hydrothermal conditions. The materials were characterised by X-ray diffraction, nitrogen adsorption at 77K. The Si/Ti values of the final calcined materials were determined by ICP analysis. It was found that all samples presented 2-D hexagonal structures with high degre...
Hydrothermal stability of ordered mesoporous titanosilicate materials prepared ...
P.C. Galacho; M.M.L. Ribeiro Carrott; P.J.M. Carrott; I.P.P. CansadoA study of hydrothermal stability, performed in boiling water under static conditions, of MCM-41 materials containing different titanium content, prepared by direct synthesis at ambient temperature and pressure, using tetraethoxysilane, titanium ethoxide and octadecyltrimethylammonium bromide is presented. The behaviour is compared with pure silica grades prepared by a similar procedure. The samples were charac...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||