40 documents found, page 1 of 4
Integration of polymeric-base wastes into petroleum refineries
Miranda, Miguel; Cabrita, Isabel; Alvarez, Nuno; Gulyurtlu, IbrahimThe continuous growth of world population along with incresing needs to improve life quality of societies and their dependence on fuel and other derived petroleum products suggest that the overall energy demand will increase significantly in the future. This chapter focuses the production of liquid fuels by pyrolysis applied to rubber tyre and diffetent plastic wastes as an option for integration in the refinin...
Carbon-based materials prepared from pine gasification residues for acetaminoph...
Galhetas, M.; Mestre, A. S.; Pinto, Moisés L.; Gulyurtlu, Ibrahim; Lopes, Helena; Carvalho, A. P.Fly ash, a residue produced frompine gasification,was used as precursor of carbon-basedmaterials assayed in acetaminophen adsorption. Materials prepared by activation with K2CO3, presented high porosity development (ABET 1200m2 g1) and samples calcined at 900 C presented high volumes of large micropores and mesopores. Kinetic and equilibrium acetaminophen adsorption data showed that the process obeys to the pse...
Chars from gasification of coal and pine activated with K2CO3: Acetaminophen an...
Galhetas, M.; Mestre, A. S.; Pinto, Moisés L.; Gulyurtlu, Ibrahim; Lopes, Helena; Carvalho, A. P.The high carbon contents and low toxicity levels of chars from coal and pine gasification provide an incentive to consider their use as precursors of porous carbons obtained by chemical activation with K2CO3. Given the chars characteristics, previous demineralization and thermal treatments were made, but no improvement on the solids properties was observed. The highest porosity development was obtained with the...
Slagging and fouling during coal and biomass cofiring: chemical equilibrium mod...
Teixeira, P. Alexandra; Lopes, Helena; Gulyurtlu, Ibrahim; Lapa, Nuno; Abelha, PedroA thermodynamic model was applied to foresee the occurrence of fouling, slagging, and bed agglomeration phenomena during fluidized bed monocombustion of three different types of biomass, namely straw pellets, olive cake, and wood pellets. The cocombustion effect in reducing the occurrence of deposits and agglomerates of blends of 5, 15, and 25% (wt.) biomass with coal was also assessed. Chemical fractionation w...
Carbon-based materials prepared from pine gasification residues for acetaminoph...
Galhetas, M.; Mestre, A. S.; Pinto, Moisés L.; Gulyurtlu, Ibrahim; Lopes, Helena; Carvalho, A. P.Fly ash, a residue produced frompine gasification,was used as precursor of carbon-basedmaterials assayed in acetaminophen adsorption. Materials prepared by activation with K2CO3, presented high porosity development (ABET 1200m2 g1) and samples calcined at 900 C presented high volumes of large micropores and mesopores. Kinetic and equilibrium acetaminophen adsorption data showed that the process obeys to the pse...
Carbon-based materials prepared from pine gasification residues for acetaminoph...
Galhetas, Margarida; Mestre, Ana S.; Pinto, Moises L.; Gulyurtlu, Ibrahim; Lopes, Helena; Carvalho, Ana P.Fly ash, a residue produced from pine gasification, was used as precursor of carbon-based materials assayed in acetaminophen adsorption. Materials prepared by activation with K2CO3, presented high porosity development (A(BET) approximate to 1200 m(2) g(-1)) and samples calcined at 900 degrees C presented high volumes of large micropores and mesopores. Kinetic and equilibrium acetaminophen adsorption data showed...
Chars from gasification of coal and pine activated with K2CO3: Acetaminophen an...
Galhetas, Margarida; Mestre, Ana S.; Pinto, Moises L.; Gulyurtlu, Ibrahim; Lopes, Helena; Carvalho, Ana P.The high carbon contents and low toxicity levels of chars from coal and pine gasification provide an incentive to consider their use as precursors of porous carbons obtained by chemical activation with K2CO3. Given the chars characteristics, previous demineralization and thermal treatments were made, but no improvement on the solids properties was observed. The highest porosity development was obtained with the...
Hydrogenation of rapeseed oil for production of liquid bio-chemicals
Pinto, Filomena; Martins, Susana; Gonçalves, Maria Margarida; Costa, Paula; Gulyurtlu, Ibrahim; Alves, Andreia; Mendes, BenildeThe main objective of rapeseed oil hydrogenation tests was the production of liquid bio-chemicals to be used as renewable raw material for the production of several chemicals and in chemical synthesis to substitute petroleum derived stuff. As, hydrogenation of vegetable oils is already applied for the production of biofuels, the work done focused in producing aromatic compounds, due to their economic value. The...
Effect of syngas composition on hydrogen permeation through a Pd–Ag membrane
Pinto, Filomena; Andre, Rui N.; Franco, Carlos; Carolino, Carlos; Gulyurtlu, IbrahimHydrogen separation from a syngas mixture with different compositions was studied by using a Pd–Ag membrane. The effect of temperature (from 300 C to 600 C) and of relative pressure (from 0.2 MPa to 0.5 MPa) was studied. In general, rises of both these parameters allowed increasing H2 permeate flux. The Pd–Ag membrane showed to have a great selectivity, as when inlet gas mixture contained different compositions...
PCDD/F formation in the co-combustion with biomass and coal: the influence of c...
Crujeira, Teresa; Moreira, Luís; Cabrita, Isabel; Gulyurtlu, IbrahimThe reduction of CO2 emissions is the primary goal of partially replacing coal with Renewable Energy Sources (RES) of biomass origin, accompanied with the reduction of emissions of other pollutants. At the same time, there are advantages in mixing this particular resource - solid biomass - with coal, due to positive synergies arising from the introduction of different amounts of volatile matter, ash, sulphur, c...