Repositório do LNEG
Repositório Científico do Laboratório Nacional de Energia e Geologia
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A Strategy to Improve Porous MOF Structural Stability for the Effective Removal of S/N Pollutants from (Bio)fuels
Publication . Silva, Dinis; Mirante, Fátima; Santos-Vieira, Isabel; Granadeiro, Carlos; Silva, Luis Cunha; Balula, Salete S.
ABSTRACT: The need to mitigate environmental pollution drives the continuous quest for advanced desulfurization and denitrogenation methods in refineries. The presence of sulfur and nitrogen compounds in fossil fuels and biofuels contributes largely to atmospheric polllution. Oxidative catalysis presents a promising way for addressing these challenges, offering efficient and environmental friendly pathways. This work investigates the heterogeneous catalytic performance of the polyoxometalates, plenary Keggin PW12 structure and the derivative lacunary PW11 structure, supported on the porous MIL-100(Fe) metal-organic framework, for simultaneous oxidative desulfurization and denitrogenation. Both PW11@MIL-100(Fe) and PW12@MIL-100(Fe) catalysts demonstrated rapid and complete desulfurization within 60 min of reaction using a sustainable H2O2 oxidant. Remarkably, PW11@MIL-100(Fe) exhibited higher catalytic efficiency and demonstrated high recycle capacity. In fact, notable results were attained to remove the most noxious pollutants in (bio)fuels, offering insights for the development of effective catalytic materials with high viability for the energy industry.
Vida e obra de Jorge Cândido Berkeley Cotter (1845-1919)
Publication . Pacheco, Marta; Cachao, Mario
RESUMO: Assinalaram-se recentemente os 180 anos do nascimento do geólogo português de ascendência irlandesa, Jorge Cândido Berkeley Cotter (1845-1919), figura que marcou a Geologia de Portugal, nomeadamente através dos seus estudos estratigráficos e paleontológicos, sobretudo no que se refere ao Miocénico português. O presente artigo desvenda um pouco da sua relativamente desconhecida personalidade, desde as suas origens até aos seus múltiplos e versáteis trabalhos que se estendem para além da Geologia, um trabalho que permanece relevante actualmente. Com uma prolífera carreira, Berkeley Cotter dedicou-se à Geologia e à Paleontologia, e até ao ensino e divulgação da língua inglesa, tendo também trabalhado como Secretário de Estado. Foi ainda responsável pela recolha de inúmeros exemplares paleontológicos que integram, entre outros, as coleções do Museu Geológico de Lisboa.
Portuguese historical palaeobotanical collections reveal a new species of late Palaeozoic marattialean fern
Publication . Correia, Pedro; Šimunek, Zbynek; Pereira, Zélia
ABSTRACT: A new Late Pennsylvanian marattialean species, Cyathocarpus felicianoi sp. nov., is described and illustrated from the Douro Carboniferous Basin, northwestern Portugal, from Stephanian C (upper Gzhelian, Upper Pennsylvanian) deposits. The studied fossil material is composed of penultimate and ultimate sterile ‘pecopterid’ frond fragments preserved as adpressions and belongs to the Carlos Teixeira's collection, an invaluable palaeobotanical collection from the Portuguese geological surveys. The description of this new fern fossil-species based on historical palaeobotanical collections, highlights the importance of natural history collections for the advancement of science, especially regarding the knowledge about diversity and richness of marattialean ferns of Euramerican Carboniferous.
Microalgae-Based Treatment of Winery Wastewater
Publication . Lopes da Silva, Teresa; Lopes, Tiago; Reis, Alberto
ABSTRACT: Winery wastewater (WWW) is a high-strength effluent characterized by high organic load, nutrient content, and seasonal variability, posing significant environmental challenges. This review critically evaluates microalgae-based systems for WWW treatment, addressing their performance, scalability, and role within circular bioeconomy frameworks. Analysis of recent studies shows that microalgae-based systems can achieve high pollutant removal efficiencies, including up to ~ 90–92% chemical oxygen demand removal, high removal of total organic carbon and nitrogen (typically above 80%), and up to 91–95% ammonium removal. These systems also enable the production of biomass rich in proteins (up to ~ 58.8% dry weight) and valuable compounds such as pigments, supporting multiple valorization pathways. A key finding is that, despite strong technical performance, large-scale implementation remains limited. The main constraints are associated with wastewater variability, presence of inhibitory compounds, and operational challenges in biomass recovery, particularly energy-intensive harvesting and downstream processing. Techno-economic and life cycle analyses indicate that standalone systems are rarely economically viable under current conditions, and that feasibility depends on integration into multiproduct biorefineries and existing infrastructures. Regulatory uncertainty and the need for stakeholder acceptance further constrain deployment. Overall, microalgae-based WWW treatment represents a promising but system-dependent solution, requiring integrated technological, economic, and policy frameworks to achieve scalable implementation.
Land use planning and safeguarding of mineral resources: the case of Portugal
Publication . Carvalho, Jorge; Lisboa, Jose; Salgueiro, Rute
ABSTRACT: An analysis of the Portuguese spatial planning policy framework and a sample of municipal master plans reveals that mineral resources are addressed within the context of extractive activities, not as natural resources worthy of safeguarding for extraction when society needs them. The approach to mineral safeguarding involves delimiting areas for the exploitation of geological resources on zoning maps and ensuring the compatibility of uses between agricultural and forestry areas with mineral extraction activities. However, practice shows that this is not adhered to in most master plans, allowing to conclude that the current legislative framework and practice severely restrict access to mineral resources.