9 documents found, page 1 of 1
Portuguese Football Federation consensus statement 2020: nutrition and performa...
Abreu, R; Figueiredo, P; Beckert, P; Marques, JP; Amorim, S; Caetano, C; Carvalho, P; Sa, C; Cotovio, R; Cruz, J; Dias, T; Fernandes, G; Goncalves, ENutrition is an undeniable part of promoting health and performance among football (soccer) players. Nevertheless, nutritional strategies adopted in elite football can vary significantly depending on culture, habit and practical constraints and might not always be supported by scientific evidence. Therefore, a group of 28 Portuguese experts on sports nutrition, sports science and sports medicine sought to discu...
Heterogeneous Catalysts: Design, Applications and Research Insights
Castanheiro, J; Caetano, C; Caiado, MThe cyclization of pseudoionone yields a mixture of alpha-ionone, beta-ionone and gamma-ionone. By careful control of reagent and reaction conditions, either the alpha- and beta- isomer can be favoured. The alpha-ionone has violet odour and is widely used in perfumery and flavours. beta-Ionone is the main precursor of Vitamin A and beta-carotene. Traditionally, strong homogeneous catalysts, like sulphuric acid ...
Biodiesel production from waste cooking oil over sulfonated catalysts
Caiado, M; Caetano, C; Castanheiro, J; Tropecelo, ABiodiesel production from waste cooking oil with methanol was carried out in the presence of poly(vinyl alcohol) with sulfonic acid groups (PVA-SO3H) and polystyrene with sulfonic acid groups (PS-SO3H), at 60°C. The PVA-SO3H catalyst showed higher catalytic activity than the PS-SO3H one. In order to optimize the reaction conditions, different parameters were studied. An increase of waste cooking oil conversion ...
Valorization of Waste Cooking Oil into Biodiesel over an Anionic Resin as Catalyst
Castanheiro, J; Rosa, H; Tropecêlo, A; Caetano, CWaste cooking oil was converted with methanol into biodiesel over a basic resin (Amberlite IRA96) as catalyst, at 60°C. In order to optimize the reaction conditions, different parameters, such as catalyst loading, temperature, nature of alcohol, molar ratio of waste cooking oil to methanol, and amount of initial free fatty acid, were studied. The catalyst was reused and recycled with negligible loss in the acti...
ESTERIFICATION OF FREE FATTY ACIDS IN THE PRESENCE OF CHITOSAN WITH SULFONIC AC...
Caetano, C; Caiado, M; Castanheiro, JSulfonic acid catalysts supported on chitosan have been studied in the esterification of palmitic, stearic an oleic acid with methanol at 60 ºC. The sulfonic acid groups were introduced onto chitosan by grafting. The catalysts were characterized by elemental analysis, SEM, FT-IR and classic titration. The chitosan with sulfonic acid groups was used as a catalyst in the esterification of oleic and stearic acids ...
Oleic Acid: Conversion of Free Fatty Acids into Biodiesel over Heterogeneous Ca...
Caetano, C; Castanheiro, JBiodiesel is an alternative to petroleum diesel. It is biodegradable and non-toxic, so it is beneficial from an environmental viewpoint. The esterification reaction of long chain carboxylic acids, such as oleic acid, is interesting in the context of biodiesel production. In this chapter, the use of different solid catalysts for the conversion of free fatty acids (especially oleic acid) into biodiesel will be re...
Esterification of free fatty acids with methanol using heteropolyacids immobili...
Caetano, C; Fonseca, I; Ramos, A; Vital, J; Castanheiro, JoseThe esterification of palmitic acid with methanol was studied using tungstophosphoric acid (PW), molibdophosphoric acid (PMo) and tungstosilicic acid (SiW) immobilized by sol–gel technique on silica, at 60 º C. It was observed that the catalytic activity decreases in the series: PW-silica > SiW-silica > PMo-silica. A series of PW immobilized on silica with different PW loadings from 2.5 wt.% to 8.4 wt.% were pr...
Esterification of fatty acids with methanol over heteropolyacids immobilized on...
Caetano, C; Castanheiro, J; Fonseca, I; Ramos, A; Vital, JBiodiesel is a clean fuel source, which is viewed as a viable alternative for dwindling petroleum-based diesel resources. the catalytic activity decreases in the series: PW-Silica>SiW-Silica>PMo-Silica. It was observed a similar catalytic activity of PW-silica for the different substrates used in esterifications.
ESTERIFICATION OF FREE FATTY ACIDS WITH METHANOL TO BIODIESEL USING HETEROGENEO...
Caetano, C; Ramos, A; Fonseca, I; Vital, J; Castanheiro, JThe esterification of palmitic acid with methanol was studied using poly(vinyl alcohol) crosslinked with sulfosuccinic acid (SSA) and polystyrene crosslinked with di-vinylbenzene with sulfonic acid groups, as catalysts, at 60ºC. It was observed that the PVA matrixes with sulfonic acid groups were more actives than the polystyrene ones. An equilibrium conversion of about 90% was achieved after 6 hours, with the ...