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- É possível limitar o direito de recurso na arbitragem tributária. Jota TributárioPublication . Domingos, Francisco NicolauConsiderando que na ordem jurídica brasileira se encontra a tramitar uma iniciativa legislativa que visa a previsão da arbitragem tributária, este é o momento adequado para escrever algumas palavras sobre a questão que a doutrina portuguesa designou como o “pecado original” do Decreto-Lei n.º 10/2011, de 20 de janeiro (Regime Jurídico da Arbitragem Tributária – RJAT), a limitação do direito ao recurso das decisões proferidas pelos tribunais arbitrais, constituídos sob a égide do Centro de Arbitragem Administrativa (CAAD). Ou, dito de outro modo: viola o regime jurídico de recursos das decisões arbitrais o princípio constitucional da tutela jurisdicional efetiva?
- Dry washing biodiesel purification using fumed silica sorbentPublication . Catarino, Mónica; Ferreira, Eduardo; Soares Dias, A. P.; Gomes, JoãoAiming the decarbonization of the transport sector, biodiesel, obtained by alcoholysis of oils or animal fats, is currently mixed with conventional fossil diesel. For this purpose, biodiesel has to comply with the established quality standards and, therefore, the production process comprises purification steps, which need huge volumes of water. Thus, the biodiesel purification procedure must be improved in order to provide a greener and low-cost renewable fuel. Biodiesel (FAME) produced by methanolysis of soybean and waste frying oils over a heterogeneous calcium - based catalyst was purified by dry washing, using commercial silica sorbent (Sipernat 22 from Evonik). ATR-FTIR spectra of post-purification sorbents showed that silica was effective to remove unreacted oil species, glycerin and Ca soap from biodiesel and, contrary to the previously reported in the literature, it was also able to remove leached calcium from the biodiesel. For both feedsotcks, the highest purity was reached for the sorption test carried out at 45 degrees C during 60 min. Sorbent regeneration was evaluated using acetone, methanol, and isopropanol alcohols at room temperature during short contact time (5 min for 1 g of sorbent and 20 mL of solvent). All the tested solvents were effective to remove the adsorbed species from silica surface.