17 documents found, page 1 of 2
Biobased routes for the upgrading of α-angelica lactone to value added products
Antunes, Margarida M.; Silva, Andreia F.; Skrodczky, Kai; Fernandes, Auguste; Ribeiro, Filipa; Russo, Patricia A.; Pinna, Nicola; Pillinger, MartynBiomass derived compounds are important building blocks to produce value added bioproducts. These bioproducts can replace fossil fuel derivatives in a more sustainable approach, contributing to reduce CO2 emissions and a circular economy. More attention has been given to angelica lactone compounds due to their potential to be reduced to gamma-valerolactone (GVL) and other biobased products with several importan...
New Insights on Sperm Function in Male Infertility of Unknown Origin: A Multimo...
Pacheco, Rita I.; Cristo, Maria I.; Anjo, Sandra I.; Silva, Andreia F.; Sousa, Maria Inês; Santos Tavares, Renata; Sousa, Ana PaulaThe global trend of rising (male) infertility is concerning, and the unidentifiable causes in half of the cases, the so-called unknown origin male infertility (UOMI), demands a better understanding and assessment of both external/internal factors and mechanisms potentially involved. In this work, it was our aim to obtain new insight on UOMI, specifically on idiopathic (ID) and Unexplained male infertility (UMI)...
Tricarbonyl-pyrazine-molybdenum(0) metal-organic frameworks for the storage and...
Silva, Andreia F.; Calhau, Isabel B.; Gomes, Ana C.; Valente, Anabela A.; Gonçalves, Isabel S.; Pillinger, MartynMetal-organic frameworks (MOFs) have high potential as nanoplatforms for the storage and delivery of therapeutic gasotransmitters or gas-releasing molecules. The aim of the present study was to open an investigation into the viability of tricarbonyl-pyrazine-molybdenum(0) MOFs as carbon monoxide-releasing materials (CORMAs). A previous investigation found that the reaction of Mo(CO)6 with excess pyrazine (pyz) ...
Pyrazine-bridged molybdenum(0) carbonyl and molybdenum(VI) oxide network solids...
Gomes, Diana M.; Silva, Andreia F.; Gomes, Ana C.; Neves, Patrícia; Valente, Anabela A.; Gonçalves, Isabel S.; Pillinger, MartynThe horizons of epoxidation and sulfoxidation processes may be expanded by developing new, efficient, and versatile catalysts. In the present work, three pyrazine-bridged molybdenum(0/VI)-based coordination network solids have been investigated for the epoxidation of olefins and the oxidation of sulfides. The materials studied were the Mo0-based metal-organic framework (MOF) fac-Mo(CO)3(pyz)3/2·1/2pyz (1) with ...
Epoxidation catalysts prepared by encapsulation of molybdenum hexacarbonyl in U...
Gomes, Diana P.; Silva, Andreia F.; Gomes, Ana C.; Neves, Patrícia; Valente, Anabela A.; Gonçalves, Isabel S.; Pillinger, MartynThe confinement and catalytic behavior of Mo(CO)6 species inside UiO-66 (zirconium and hafnium) metalorganic frameworks (MOFs) have been investigated by means of multitechnique characterization and catalytic olefin epoxidation. Mo(CO)6 was encapsulated in nanocrystalline MOFs by solvothermal and vapor phase impregnation methods (STI and VPI, respectively), resulting in Mo loadings of 2.0–8.8 wt% (STI) or 15 wt%...
Renewable bio-based routes to γ-valerolactone in the presence of hafnium nanocr...
Antunes, Margarida M.; Silva, Andreia F.; Fernandes, Auguste; Pillinger, Martyn; Ribeiro, Filipa; Valente, Anabela A.Different renewable bio-based routes leading to the versatile bioproduct c-valerolactone (GVL) were studied in integrated fashions, starting from furfural (Fur), a-angelica lactone (AnL) and levulinic acid (LA), in the presence of multifunctional hafnium-containing catalysts, in alcohol media. These routes involved acid and reduction reactions for which multifunctional catalysts were prepared via top-down strat...
Micro/mesoporous LTL derived materials for catalytic transfer hydrogenation and...
Antunes, Margarida M.; Silva, Andreia F.; Fernandes, Auguste; Ribeiro, Filipa; Neves, Patrícia; Pillinger, Martyn; Valente, Anabela A.The biomass-derived platform chemicals furfural and 5-(hydroxymethyl)furfural (HMF) may be converted to α-angelica lactone (AnL) and levulinic acid (LA). Presently, LA (synthesized from carbohydrates) has several multinational market players. Attractive biobased oxygenated fuel additives, solvents, etc., may be produced from AnL and LA via acid and reduction chemistry, namely alkyl levulinates and γ-valerolacto...
γ-Valerolactone synthesis from α-angelica lactone and levulinic acid over bioba...
Antunes, Margarida M.; Silva, Andreia F.; Fernandes, Auguste; Valente, Anabela A.The selective chemical conversion of biomass components to useful bioproducts may contribute to a renewable resource-based economy. The selective production of target bioproducts may be accomplished using heterogeneous catalysts operating under relatively moderate reaction conditions. In this work, carbohydrate biomass derived α-angelica lactone (AnL) and levulinic acid (LA) were converted to the versatile biop...
A hafnium-based metal-organic framework for the entrapment of molybdenum hexaca...
Silva, Andreia F.; Calhau, Isabel B.; Gomes, Ana C.; Valente, Anabela A.; Gonçalves, Isabel S.; Pillinger, MartynA carbon monoxide-releasing material (CORMA) has been prepared by inclusion of molybdenum hexacarbonyl in a hafnium-based metal-organic framework (MOF) with the UiO-66 architecture. Mo(CO)6 was adsorbed from solution to give supported materials containing 6.0-6.6 wt% Mo. As confirmed by powder X-ray diffraction (PXRD) and SEM coupled with energy dispersive X-ray spectroscopy, neither the crystallinity nor the m...
Catalytic Transfer Hydrogenation and Acid Reactions of Furfural and 5-(Hydroxym...
Antunes, Margarida M.; Silva, Andreia F.; Bernardino, Carolina D.; Fernandes, Auguste; Ribeiro, Filipa; Valente, Anabela A.Heterogeneous catalysis, which has served well the petrochemical industry, may valuably contribute towards a bio-based economy by sustainably enabling selective reactions to renewable chemicals. Carbohydrate-containing matter may be obtained from various widespread sources and selectively converted to furanic platform chemicals: furfural (Fur) and 5-(hydroxymethyl)furfural (Hmf). Valuable bioproducts may be obt...