Encontrados 12 documentos, a visualizar página 1 de 2
Adsorption of MCPA on different activated carbons
Mourão, P.A.M.; Cansado, I.P. P.; Ribeiro Carrott, M.M.L.; Carrott, P.J.M.Pesticides play an important role in the success of modern farming and food production but their use increases the residue levels in soils and waters and has been a public concern because of the potential risk to human health and the environment. Pesticides are generally applied in larger amounts than those needed for the pest control and they are swept away by transport processes such as leaching. Liquid phase...
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...
Amine-modified Carbon Aerogels for CO2 Capture
Marques, L.M.; Carrott, P.J.M.; Ribeiro Carrott, M.M.L.Ten different amines of different molar mass and structure were deposited from aqueous and methanolic solutions of different concentrations onto two types of carbon aerogel. Thermogravimetric analysis (TGA) was used to quantify the loading, thermal stability and CO2 capture capacity of the materials. Our results show that the amount of amine deposited did not depend on the solvent used, but was generally greate...
Using different AC to improve MCPA removal from liquid phase
Cansado, I.P.P.; Mourão, P.A.M.; Ribeiro Carrott, M.M.L.; Carrott, P.J.M.The work presented here focuses on the adsorption of MCPA on a series of ACs prepared from recycled PET or cork via different activation methods. All ACs were characterised by nitrogen adsorption at 77 K and by elemental analysis. The adsorption isotherms of MCPA were determined on selected ACs, where the same amount of AC was added to flasks containing equal volumes of aqueous solutions with different initial...
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 and pre-adsorption for the detailed characterisation of clay catalysts
Ribeiro Carrott, M.M.L.; Cansado, I.P.P.; Carrott, P.J.M.; Castilho, P.; Catrinescu, C.; Fernandes, C.; Breen, C.Ion exchange and acid activation are easy and appropriate modification treatments for obtaining versatile clay derived catalysts which can be tailored for a precise reaction of interest. Depending on the specific conditions and also on the nature of the starting clays, the alterations in the porosity and the surface chemistry that occur can be determinant for the catalytic performance, in particular for selecti...
Porosity of clay catalysts for biomass conversion: a comparative study
Ribeiro Carrott, M.M.L.; Cansado, I.P.P.; Castilho, P.; Carrott, P.J.M.; Catrinescu, C.; Fernandes, C.; Breen, C.A detailed description of the porosity, in particular of microporosity, was reported and allowed a clear comparison of the effects on the porosity of chemical treatments on clays from the Source Clays Repository (USA) and SD clay from Porto Santo (Portugal).
Selective methoxylation of limonene over ion-exchanged and acid-activated clays
Catrinescu, C.; Fernandes, C.; Castilho, P.; Breen, C.; Ribeiro Carrott, M.M.L.; Cansado, I.P.P.In this study, we report the use of clay-based catalysts in the methoxylation of limonene, for the selective synthesis of terpinyl methyl ether. Na-SAz-1, Ca-SWy-2 and Sap-Ca source clays and a montmorillonite (SD) from Porto Santo, Madeira Archipelago, Portugal were modified by (i) ion-exchange with Al, Fe, Ni and Na and (ii) acid activation, to produce catalysts with markedly different acidic and textural pr...
CO2 capture by amine impregnated carbon aerogels
Marques, L.M.; Carrott, P.J.M.; Ribeiro Carrott, M.M.L.In this work, CO2 adsorption/ desorption performance over carbon aerogels impregnated with amines of different molecular mass and structure, is reported.
Adsorção/imobilização de fármacos e corantes em materiais mesoporosos ordenados...
Galacho, C.; 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.
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