104 documents found, page 1 of 11
Silica-embedded metal oxide nanoparticles as epoxidation catalysts: batch and c...
Gomes, Diana M.; Yao, Xingyu; Neves, Patrícia; Antunes, Margarida M.; Pinna, Nicola; Russo, Patrícia A.; Valente, Anabela A.Catalytic epoxidation of olefins gives epoxide chemicals for several end-user products. With the technological advancements of these processes (especially for light olefins), which have importantly contributed to the epoxides market expansion, challenges remain in developing adequate heterogeneous catalysts for converting bulkier olefins, using simple catalyst synthesis procedures, and, on the other hand, study...
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...
Inclusion complexes of cucurbit[n]urils (n = 7, 8) with η5‐cyclopentadienyl met...
Neves, Patrícia; Gomes, Ana C.; Monteiro, Rodrigo P.; Santos, Mirela J.; Valente, Anabela A.; Lopes, André D.; Gonçalves, Isabel S.; Pillinger, MartynThere are very few known examples of supramolecular compounds comprising molybdenum species hosted inside the portals/cavities of cucurbit[n]urils (CBn). In this work, CB7 and CB8 macrocycles have been studied as hosts for the carbonyl complex [CpMo(CO)3Me] (1) (Cp = η5-C5H5). Compounds were isolated in the solid state and characterized as genuine 1:1 inclusion complexes (1@CBn) by elemental and thermogravimetr...
Effect of 4,4′-dialkyl-2,2′-bipyridine ligands on the hydrolysis of dichlorodio...
Gomes, Diana M.; Gomes, Ana C.; Neves, Patrícia; Almeida Paz, Filipe A.; Valente, Anabela A.; Gonçalves, Isabel S.; Pillinger, MartynMolybdenum catalysts have been industrially recognized for decades for liquid phase epoxidation, which is an important chemical reaction process, since epoxides are used for many industrial applications. In this work, molybdenum oxide hybrid catalysts, prepared by a reflux hydrolysis methodology, performed effectively as heterogeneous catalysts or reaction-induced self-separating catalysts under mild reaction c...
Bulky olefin epoxidation under mild conditions over Mo-based oxide catalysts
Gomes, Diana M.; Yao, Xingyu; Neves, Patrícia; Pinna, Nicola; Russo, Patrícia A.; Valente, Anabela A.Molybdenum-based epoxidation catalysts are among the most investigated since the homogeneous Mo-based catalytic process claimed by Halcon International Inc. for liquid phase olefin epoxidation (EPO). While homogeneous Mo-based catalytic technologies reached industrial implementation for olefin EPO, the same does not apply for heterogeneous Mo-based ones, which have not reached industrial implementation (e.g., t...
Versatile polyoxometalates of different structural dimensionalities for liquid ...
Neves, Patrícia; Simões, Guilherme; Napruszewska, Bogna D.; Pamin, Katarzyna; Serda, Paweł; Łasocha, Wieslaw; Valente, Anabela A.Ionic polymolybdate compounds (IPOM) possessing the anions [Mo8O26]4− and [Mo3O10]2−, and cyclohexylammonium (Cy6N) or anilinium (Anil) as organic cations, namely cyclohexylammonium β-octamolybdate dihydrate (1), cyclohexylammonium trimolybdate hydrate (2), anilinium β-octamolybdate dihydrate (3), anilinium trimolybdate tetrahydrate (4) and anilinium trimolybdate dihydrate (5), were synthesized via simple, eco-...
Chemical valorisation of biomass derived furanics and carboxylic acids over nio...
Antunes, Margarida M.; Cabanelas, Pedro S.; Skrodczky, Kai; Pinna, Nicola; Russo, Patrícia A.; Valente, Anabela A.Furfural is an industrial renewable platform chemical, which can be converted to useful furanics such as -angelica lactone, carboxylic acids such as levulinic acid and valeric acid, or to higher carbon content via condensation routes for producing drop-in fuel replacements and chemicals with diverse applications. These important conversion processes may be carried out in selective fashions, albeit require adeq...
Inclusion complexes of cucurbit[n]urils (n = 7, 8) with η5 -cyclopentadienyl me...
Neves, Patrícia; Gomes, Ana C.; Monteiro, Rodrigo P.; Santos, Mirela J.; Valente, Anabela A.; D. Lopes, André; Gonçalves, Isabel S.; Pillinger, MartynThere are very few known examples of supramolecular compounds comprising molybdenum species hosted inside the portals/cavities of cucurbit[n]urils (CBn). In this work, CB7 and CB8 macrocycles have been studied as hosts for the carbonyl complex [CpMo(CO)(3)Me] (1) (Cp = eta(5)-C5H5). Compounds were isolated in the solid state and characterized as genuine 1:1 inclusion complexes (1@CBn) by elemental and thermogra...
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) ...
Reaction induced self-separating metal catalysts – Wonder systems in 21st centu...
Neves, Patrícia; Gomes, Diana M.; Gonçalves, Isabel S.; Pillinger, Martyn; Valente, Anabela A.The term Catalysis was first coined in the 19th century and has since been recognized as a fundamental field contributing to the greenness and sustainability of chemical processes. This inspiring field has many wonders. A discovery of the 21st century is reaction-controlled or reaction-induced self-separating (RISS) metal-based catalytic systems, essentially based on coordination compounds, which combine featur...