32 documents found, page 1 of 4
Unlocking nature's potential: Modelling acacia melanoxylon as a renewable resou...
Ozkan, Sila; Sousa, Henrique; Gonçalves, Diogo; Puna, Jaime; Carvalho, Ana; Bordado, João; Santos, Rui Galhano dos; Gomes, JoãoThis study is focused on the modelling of the production of bio-oil by thermochemical liquefaction. Species Acacia melanoxylon was used as the source of biomass, the standard chemical 2-Ethylhexanol (2-EHEX) was used as solvent, p-Toluenesulfonic acid (pTSA) was used as the catalyst, and acetone was used for the washing process. This procedure consisted of a moderate acid-catalysed liquefaction process and was ...
Unlocking nature’s potential: modelling Acacia melanoxylon as a renewable resou...
Ozkan, Sila; Sousa, Henrique; Gonçalves, Diogo; Puna, Jaime; Carvalho, Ana; Bordado, João; Santos, Rui Galhano dos; Gomes, JoãoThis study is focused on the modelling of the production of bio-oil by thermochemical liquefaction. Species Acacia melanoxylon was used as the source of biomass, the standard chemical 2-Ethylhexanol (2-EHEX) was used as solvent, p-Toluenesulfonic acid (pTSA) was used as the catalyst, and acetone was used for the washing process. This procedure consisted of a moderate acid-catalysed liquefaction process and was ...
Modelling of burnt pine heartwood acid-catalysed liquefaction
Ozkan, Sila; Gonçalves, Diogo; Paulo, Ivo; Queirós, Carla S. G. P.; Carvalho, Ana; Puna, Jaime; Gomes, João; Bordado, João; Santos, Rui Galhano dosThis study focused on bio-oil production by thermochemical liquefaction. For the reaction, the burnt pine heartwood was used as feedstock material, 2-Ethylhexanol (2-EHEX) was used as a solvent, p-Toluenesulfonic acid (pTSA) was used as a catalyst, and the solvent for washing was acetone. The procedure consisted of a moderate-acid-catalysed liquefaction process, and it was applied at three different temperature...
A brief review of the supercritical antisolvent (SAS) technique for the prepara...
Santos, Samuel; Puna, Jaime; Gomes, João F. P.In an era where sustainability is becoming the main driving force for research and development, supercritical fluids-based techniques are presented as a very efficient alternative technology to conventional extraction, purification, and recrystallization processes. Supercritical antisolvent (SAS) precipitation is a novel technique that can replace liquid antisolvent precipitation techniques. Additionally, throu...
Clean forest—project concept and early results
Gomes, João; Puna, Jaime; Marques, António; Gominho, Jorge; Lourenço, Ana; Galhano dos Santos, Rui; Ozkan, SilaThe Clean Forest project aims to valorize forest biomass wastes (and then prevent their occurrence as a fuel source in forests), converting it to bioenergy, such as the production of 2nd generation synthetic biofuels, like bio-methanol, bio-DME, and biogas, depending on the process operating conditions. Valorization of potential forest waste biomass thus enhances the reduction of the probability of occurrence o...
Production of synthesis gas obtained via alkaline water electrolysis and added ...
Gomes, João; Puna, Jaime; Santos, Maria TeresaThis paper presents the results of the research currently being carried out at ISEL with the objective of developing new electrochemistry-based processes to obtain renewable synthetic fuels from alkaline water electrolysis using a carbon source. In the developed process, the gas mixture obtained from alkaline water electrolysis and a carbon source is not separated into their components but rather is introduced ...
Life cycle analysis of a combined electrolysis and methanation reactor for meth...
Federici, Flavio; Puna, Jaime; Mata, Teresa M.; Martins, António A.The need to decarbonize industrial processes and to increase the utilization of renewable resources, either energy and raw materials, has led to the development of new production processes. The focus of this paper is to evaluate the environmental impacts of an innovative 1 kW pilot plant for methane production, following the life cycle thinking approach. The process is based on the coupling of an alkaline water...
The role of alkali dopants on the oil methanolysis behavior of lime catalyst: a...
Soares Dias, A. P.; Puna, Jaime; Gomes, João; Ramos, Marta; Rijo, Bruna; Bordado, JoãoHeterogeneous basic catalysts, namely calcium oxide, are referred to as promising catalysts for biodiesel (FAME, fatty acid methyl esters) production since they can be easily separated from the reaction medium allowing them to operate in a continuous mode. Despite the relatively high catalytic activity of calcium catalysts, they present slower alcoholysis rates than homogeneous conventional catalysts (sodium or...
Clean forest – project concept and preliminary results
Gomes, João; Puna, Jaime; Marques, António; Gominho, Jorge; Lourenço, Ana; Santos, Rui Galhano dos; Ozkan, SilaThe Clean Forest project aims to valorize forest biomass wastes (and then prevent their occurrence as a fuel source in forests), converting it to bioenergy, such as the production of 2nd generation synthetic biofuels, like bio-methanol, bio-DME, and biogas, depending on the process operating conditions. Valorization of potential forest waste biomass thus enhances the reduction of the probability of occurrence o...
Communication Clean Forest—Project Concept and Early Results
Gomes, João; Puna, Jaime; Marques, António; Gominho, Jorge; Lourenço, Ana; Galhano, Rui; Ozkan, SilaThe Clean Forest project aims to valorize forest biomass wastes (and then prevent their occurrence as a fuel source in forests), converting it to bioenergy, such as the production of 2nd generation synthetic biofuels, like bio-methanol, bio-DME, and biogas, depending on the process operating conditions. Valorization of potential forest waste biomass thus enhances the reduction of the probability of occurrence o...