Repositório do LNEG
National Laboratory of Energy and Geology Scientific Repository
Recent Submissions
The UTE-PLANAGEO Project (National Geology Plan of Angola). Objectives, methods, and results
Publication . Garcia-Lobon, Jose Luis; Merino-Martinez, Enrique; Fernández, J.; Carvalho, João; Batista, Maria Joao; Escuder, Javier; Lisboa, Jose; Martín-Banda, Raquel; Francés, Alain Pascal; Ramalho, Elsa; Martín-Méndez, I.; Rey-Moral, Carmen; Feria, María Carmen; Mochales, Tania; Ferreira, Ezequiel; Cuervo, I.; Manuel, José; Victorino, Américo da Mata
ABSTRACT: The National Geology Plan of Angola (PLANAGEO) has been one of the most important Angolan infrastructure projects throughout the past twenty years. The objectives of PLANAGEO were: (a) to enhance Angola's geological and mineral resources knowledge; (b) to foster diversification of the national economy; and, (c) to attract foreign investment and promote the country development. The project integrated regional interdisciplinary geological surveys, including geological/aerogeophysical/geochemical mapping, raw materials and mineral resources prospecting, as well as specific studies in target areas. The project was launched by the Angolan government (Presidential Resolution 52/09), and implemented by the Geological Survey of Angola (IGEO), under the oversight of the Angolan Ministry of Mineral Resources, Oil and Gas (MIREMPET). In 2011, UTE consortium, a joint venture of IGME, the National Laboratory of Energy and Geology of Portugal (LNEG) and the Spanish company Impulso Industrial Alternativo (IIA) bid the call for tenders. In 2013 IGEO awarded UTE a contract to undertake PLANAGEO´s activities in the southwestern region of Angola, covering roughly 480.000 km2. From July of 2014 to the end of 2022, the UTE consortium conducted interdisciplinary studies and investigations that resulted in a comprehensive collection of maps and scientific reports and documents, comprising: Airborne geophysical mag/rad mapping. Geological mapping at 1:250.000 scale (and 1:500.000 and 1:1.000.000 synthesis). Geological mapping at 1:100.000 scale in selected areas. Geochemical mapping at 1:250.000 scale. Raw materials and Mineral resources mapping in target areas, at 1:50.000 scale.
Enhancing Proton Conductivity of SPEEK Based Membranes by Incorporation Graphene Oxide / Bisphosphonic acid dopant [Resumo]
Publication . Teixeira, Fatima; Teixeira, António Paulo Silva; Rangel, Carmen M.
ABSTRACT: The most commercially successful membrane for applications in fuel cell and electrolyzers, perfluorinated sulfonic NafionR, exhibits relevant performance limitations due to its dependence on water content with consequent proton mobility restrictions, environmental concerns and very high cost. Poly(etheretherketone) (SPEEK) polymer appears as a versatile non-fluorinated alternative for a low-cost and a more environmentally friendly membrane. Our previous studies showed that the incorporation of biphosphonic acid dopants (BPs) into the mentioned polymeric matrices, improves membrane proton conduction and durability1-5. In this work, we prepared and evaluated new doped SPEEK membranes using graphene oxide (GO) with bisphosphonic acid functionalities as dopant (GOBP), anticipating superior membranes properties, including proton conductivity.
Li-ion Battery Recycling: A Summary Review
Publication . Nogueira, Carlos; Neiva Correia, Maria Joana; Margarido, Fernanda; Plancha, Maria João; Pedrosa, Fátima; Gonçalves, Ana; Silva, Clara; Silva, Sara
ABSTRACT: A short review of battery recycling technologies is presented. Main components and materials of battery cells, modules and packs are identified, highlighting their compositions and contents. Main component of packs is aluminium, followed by the cathode materials, anode materials, copper and polymers. Safe discharge of the spent batteries is mandatory, and the subsequent dismantling allows separation and valorisation of the aluminium casings, electronic components, polymers and steel. The resulting cells or modules are pretreated by shearing and drying, and the solvent and evolving gases shall be safely treated and disposed. Physical separation operations, including secondary shredding, sieving, gravity separation, among others, are applied to separate the Al, Cu and polymer fragments from the electrode powders (black mass). Metallurgical processing, by hydro or pyrometallurgy, allows further recovery of the metals in pure forms, which are then sent back to the market. Nowadays, several hydrometallurgical processes are being introduced, allowing high recovery yields of the most important metals such as lithium, cobalt, nickel and manganese. By this way, a more sustainable management of the resources can be achieved.
Functional alginate aerogels as green catalytic platform for CO₂-to-syngas conversion [Resumo]
Publication . Messias, Sofia; Paninho, A. B.; Vieira, G.; Souza, A.; Rangel, Carmen M.; Nunes, Daniela; Martins, Rodrigo; Mendes, Manuel Joao; Machado, Ana
Solar Electrochemical CO2 Reduction to Syngas [Resumo]
Publication . Messias, Sofia; Paninho, A. B.; Nunes, Daniela; Rangel, Carmen M.; Nunes, A. V. M.; Branco, Luis; Martins, Rodrigo; Mendes, Manuel Joao; Machado, Ana