14 documents found, page 1 of 2
Porosity in ion-exchanged and acid activated clays evaluated using n-nonane pre...
Ribeiro Carrott, M.M.L.; Cansado, I.P.P.; Carrott, P.J.M.; Russo, P.A.; Castilho, P.; Fernandes, C.; Catrinescu, C.; Breen, C.The applicability of the n-nonane pre-adsorption method for characterising the porosity in clays is presented. Na-SD, a Naþ-exchanged purified bentonite, and materials obtained by Al3þ-exchange and acid treatments of Na-SD and SAz-1 were used. Nitrogen adsorption isotherms, at 196 C, were determined before and after n-nonane pre-adsorption on each of the samples. In all materials, n-nonane remained adsorbed in ...
Catalisadores derivados de uma argila do Porto Santo: efeito da ativação ácida ...
Ribeiro Carrott, M.M.L.; Cansado, I.P.P.; Russo, P.A.; Carrott, P.J.M.; Catrinescu, C.; Castilho, P.; Fernandes, C.; Breen, C.No âmbito de um projeto de investigação em curso (PTDC/CTM-CER/121295/2010), materiais derivados de argilas, de várias proveniências e submetidas a diferentes tratamentos de modificação, estão a ser usados como catalisadores em várias reações de interesse, como, por exemplo, na metoxilação do limoneno e na conversão do glicerol. Uma das possíveis vantagens, face a outros catalisadores alternativos, relaciona-se...
Adsorption of n-Pentane on Mesoporous Silica and Adsorbent Deformation
Gor, G.Y.; Paris, O.; Prass, J.; Russo, P.A.; Ribeiro Carrott, M.M.L.; Neimark, A.V.Development of quantitative theory of adsorption-induced deformation is important, e.g., for enhanced coalbed methane recovery by CO2 injection. It is also promising for the interpretation of experimental measurements of elastic properties of porous solids. We study deformation of mesoporous silica by n-pentane adsorption. The shape of experimental strain isotherms for this system differs from the shape predict...
Adsorção/imobilização de fármacos e corantes em materiais mesoporosos ordenados...
Galacho, Cristina; Ribeiro Carrott, M.M.L.; Carvalhal, C; Caixinha, N; Russo, P.A.; Carrott, P.J.M.Estudo da influência das propriedades de materiais mesoporosos ordenados, do tipo SBA-15 e MCM-41, assim como, das condições operacionais do meio, no processo de adsorção/imobilização de naproxeno (anti-inflamatório não esteroíde), norfloxacina (antibiótico) e rodamina 6B.
Volatile Organic Compound Adsorption on a Nonporous Silica Surface: How Do Diff...
Herdes, C.; Ribeiro Carrott, M.M.L.; Russo, P.A.; Carrott, P.J.M.In this work, we compare experimental results to molecular simulation results of volatile organic compound (VOC) adsorption on nonporous silica.We adopted an effective model for the rough solid surface, obtained by a temperature annealing scheme, plus an experimental/simulation nitrogen adsorption tuning process over the silica energetic oxygen parameter. The measurement/prediction of selected VOCs, specificall...
Nitrogen Adsorption Studies on Non-porous Silica: the Annealing Effect over Sur...
Herdes, C.; Russo, P.A.; Ribeiro Carrott, M.M.L.; Carrott, P.J.M.This contribution compares experimental nitrogen adsorption isotherms with molecular simulation results on effective non-porous silica models. A Molecular Dynamic (MD) annealing temperature scheme was adopted for the formulation of three samples of the solid surface. By means of Grand Canonical Monte Carlo (GCMC) simulations, nitrogen adsorption isotherms were obtained for each sample, with charged and uncharge...
Tailoring the surface chemistry of mesocellular foams for protein adsorption
Russo, P.A.; Ribeiro Carrott, M.M.L.; Mourão, P.A.M.; Carrott, P.J.M.Adsorption of bovine serum albumin (BSA) at pH 5 and lysozyme (LYS) at pH 8 on MCF silica functionalised with chloromethyl (CM), mercaptopropyl (MP), octyl (Oc) or aminopropyl (AP) groups was investigated and compared with that on the unmodified silica material. The results show that the adsorption performance of the solid (adsorption capacity and adsorption rates) can be tailored by incorporating a specific ty...
Hydrocarbons adsorption on templated mesoporous materials: effect of the pore s...
Russo, P.A.; Ribeiro Carrott, M.M.L.; Carrott, P.J.M.Adsorption–desorption isotherms of aromatic (mesitylene and toluene) and aliphatic (methylcyclohexane, neopentane and n-pentane) hydrocarbons were measured on ordered mesoporous materials, including MCM-41, MCM-48, SBA-15, SBA-16 and MCF silicas, a periodic mesoporous organosilica and a CMK-3 carbon, in order to evaluate the effect of the adsorbent characteristics on the organic compounds adsorption behaviour. ...
Catalytic conversion of limonene over acid activated Serra de Dentro (SD) bento...
Fernandes, C.; Catrinescu, C.; Castilho, P.; Russo, P.A.; Carrott, M.R.; Breen, C.A series of acid-activated clay catalysts were prepared from a purified bentonite, rich in structural iron, collected at Serra de Dentro on the island of Porto Santo. The purified bentonite exhibited a surface area of 130 m2 g_1 which increased to values as high as 500 m2 g_1 following activation with 4M HCl at 95 oC for 30 min (SD-4M-95-30). The ability of the activated samples to convert limonene to p-cymene ...
Trends in the condensation/evaporation and adsorption enthalpies of volatile or...
Russo, P.A.; Ribeiro Carrott, M.M.L.; Carrott, P.J.M.The adsorption-desorption of toluene, methylcyclohexane, neopentane and n-pentane was measured at temperatures between 258-308K on mesoporous silica materials with different pore structures and pore sizes (MCM-41, SBA-15, SBA-16, LPC and MCF). It was found that the change in the width of the hysteresis cycles with temperature is similar for MCM-41, SBA-15 and MCF but distinct for the materials having pores acce...