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Electrochemical production of syngas from CO2 at pressures up to 30 bar in elec...
Messias, Sofia; Sousa, Miguel M.; Ponte, Manuel Nunes; Rangel, C. M.; Pardal, T.; Machado, AnaABSTRACT: Electrochemical CO2 reduction in a reactor that can operate up to 100 bar and 80 degrees C, with a configuration similar to that of an alkaline electrolyser, for hydrogen production suitable to be used industrially is reported for the first time. The effect of pressure on the co-electrolysis of CO2 and water was studied. The successful scale-up from a previously reported batch process to electrodes of...
Electrochemical CO2 reduction at room temperature and mild pressures
Messias, Sofia; Sousa, Miguel M.; Ponte, Manuel Nunes; Rangel, C. M.; Pardal, T.; Machado, AnaABSTRACT: Carbon capture and utilization technologies (CCU) and electrolytic hydrogen production are closely interconnected technologies and necessary for a sustainable energy system. This work describes the development of a process for room temperature co-electrolysis of CO2 and water to produce syngas, at mild pressures. The influence of several parameters in the performance of the process is reported.
Electrochemical production of syngas from CO2 at pressures up to 30 bar in elec...
Messias, Sofia; Sousa, Miguel M.; Ponte, Manuel Nunes; Rangel, C. M.; Pardal, T.; Machado, AnaABSTRACT: Electrochemical CO2 reduction in a reactor that can operate up to 100 bar and 80 degrees C, with a configuration similar to that of an alkaline electrolyser, for hydrogen production suitable to be used industrially is reported for the first time. The effect of pressure on the co-electrolysis of CO2 and water was studied. The successful scale-up from a previously reported batch process to electrodes of...
Electrochemical CO2 reduction at room temperature and mild pressures
Messias, Sofia; Sousa, Miguel M.; Ponte, Manuel Nunes; Rangel, C. M.; Pardal, T.; Machado, AnaABSTRACT: Carbon capture and utilization technologies (CCU) and electrolytic hydrogen production are closely interconnected technologies and necessary for a sustainable energy system. This work describes the development of a process for room temperature co-electrolysis of CO2 and water to produce syngas, at mild pressures. The influence of several parameters in the performance of the process is reported.
Pressurized electrochemical process for syngas production [Resumo]
Messias, Sofia; Sousa, Miguel M.; Rangel, C. M.; Pardal, T.; Ponte, Manuel Nunes; Machado, AnaABSTRACT: Carbon Capture and Utilisation (CCU) comprise technologies that capture carbon dioxide and convert it into chemical products, such as fuels, chemicals and building materials that can replace the same products derived from fossil resources. These technologies can thus contribute to reach the ambitious 2030 targets set by the European Union for decarbonisation of the economy of 40% CO2 reduction, introd...
CO2+Methanol+Glycerol : multiphase behaviour
Carrera, Gonçalo V. S. M.; Visak, Zoran P.; Lukasik, Rafal M.; Ponte, Manuel NunesABSTRACT: The phase behaviour of the system CO2+methanol+glycerol has been studied at low concentrations of this trialcohol. The synthetic method was implemented in a visual sapphire cell. New phase diagrams were obtained at temperatures of 313.15 and 333.15 K. Different methanol/glycerol molar ratios of 113, 50 and 30 were considered and its influence on phase behaviour accounted for. Pressures were varied fro...
CO2+Methanol+Glycerol : multiphase behaviour
Carrera, Gonçalo V. S. M.; Visak, Zoran P.; Lukasik, Rafal M.; Ponte, Manuel NunesABSTRACT: The phase behaviour of the system CO2+methanol+glycerol has been studied at low concentrations of this trialcohol. The synthetic method was implemented in a visual sapphire cell. New phase diagrams were obtained at temperatures of 313.15 and 333.15 K. Different methanol/glycerol molar ratios of 113, 50 and 30 were considered and its influence on phase behaviour accounted for. Pressures were varied fro...
Tetramethylguanidine-based gels and colloids of cellulose
Carrera, Gonçalo V.S.M.; Raymundo, Anabela; Fernandes, Francisco M. Braz; Jordão, Noemi; Sousa, Isabel; Ponte, Manuel Nunes; Branco, Luís C.Novel and stable gels of cellulose were produced. These gels are prepared at room temperature by com-bination of cellulose and tetramethylguanidine (TMG) in different ratios (1:1, 1:2, 1:3 in equivalents ofalcohol groups of cellulose per number of molecules of TMG). Detailed NMR, SEM, rheological and XRDstudies of these gels were carried out. The concentration of cellulose in the gel, temperature, frequency ofo...
Ammonium ionic liquids as green solvents for drugs
Melo, Catarina I.; Lukasik, Rafal M.; Ponte, Manuel Nunes; Bogel-Lukasik, EwaA high solubility of antituberculosis antibiotic drugs: isoniazid and pyrazinecarboxamide in ammonium ionic liquids shown in this work, demonstrates the promising perspectives in the drug processing. Solid–liquid equilibrium (SLE) measurements have been made using a dynamic (synthetic) method. Thermophyscial properties such as melting point, enthalpy of fusion, temperatures of phase transitions and correspondin...
Intramolecular C–H insertion catalyzed by dirhodium(II) complexes using CO2 as ...
Zakrzewska, Malgorzata E.; Cal, Pedro M.S.D.; Candeias, Nuno R.; Lukasik, Rafal M.; Afonso, Carlos A.M.; Ponte, Manuel Nunes; Gois, Pedro M.P.In this work, the intramolecular C–H insertion of diazoacetamides catalyzed by dirhodium(II) complexes and using CO2 as solvent is disclosed. The expected lactams were obtained in yields over 97%. The asymmetric intramolecular C–H insertion was also achieved and the β-lactam 14 was obtained in >97% yield and 65% ee using the chiral dirhodium(II) catalyst Rh2(S-PTTL)4. Finally, the dirhodium(II) complex Rh2(OAc)...