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PUBLICATIONS
2021
Colom-Díaz, Juan Manuel; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
New results of H2S oxidation at high pressures. Experiments and kinetic modeling Artículo de revista
En: Fuel, vol. 285, pp. 119261, 2021, ISSN: 00162361.
@article{Colom-Diaz2021,
title = {New results of H2S oxidation at high pressures. Experiments and kinetic modeling},
author = {Juan Manuel Colom-Díaz and Ángela Millera and Rafael Bilbao and María U Alzueta},
url = {https://linkinghub.elsevier.com/retrieve/pii/S0016236120322572},
doi = {10.1016/j.fuel.2020.119261},
issn = {00162361},
year = {2021},
date = {2021-02-01},
journal = {Fuel},
volume = {285},
pages = {119261},
publisher = {Elsevier},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Benés, Mario; Pozo, Guillermo; Abián, María; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
Experimental Study of the Pyrolysis of NH3under Flow Reactor Conditions Artículo de revista
En: Energy and Fuels, 2021, ISSN: 15205029.
@article{Benes2021,
title = {Experimental Study of the Pyrolysis of NH3under Flow Reactor Conditions},
author = {Mario Benés and Guillermo Pozo and María Abián and Ángela Millera and Rafael Bilbao and María U Alzueta},
url = {https://dx.doi.org/10.1021/acs.energyfuels.0c03387},
doi = {10.1021/acs.energyfuels.0c03387},
issn = {15205029},
year = {2021},
date = {2021-01-01},
journal = {Energy and Fuels},
publisher = {American Chemical Society},
abstract = {The possibility of using ammonia (NH3), as a fuel and as an energy carrier with low pollutant emissions, can contribute to the transition to a low-carbon economy. To use ammonia as fuel, knowledge about the NH3 conversion is desired. In particular, the conversion of ammonia under pyrolysis conditions could be determinant in the description of its combustion mechanism. In this work, pyrolysis experiments of ammonia have been performed in both a quartz tubular flow reactor (900-1500 K) and a non-porous alumina tubular flow reactor (900-1800 K) using Ar or N2 as bath gas. An experimental study of the influence of the reactor material (quartz or alumina), the bulk gas (N2 or Ar), the ammonia inlet concentration (1000 and 10a 000 ppm), and the gas residence time [2060/T (K)-8239/T (K) s] on the pyrolysis process has been performed. After the reaction, the resulting compounds (NH3, H2, and N2) are analyzed in a gas chromatograph/thermal conductivity detector chromatograph and an infrared continuous analyzer. Results show that H2 and N2 are the main products of the thermal decomposition of ammonia. Under the conditions of the present work, differences between working in a quartz or non-porous alumina reactor are not significant under pyrolysis conditions for temperatures lower than 1400 K. Neither the bath gas nor the ammonia inlet concentration influence the ammonia conversion values. For a given temperature and under all conditions studied, conversion of ammonia increases with an increasing gas residence time, which results into a narrower temperature window for NH3 conversion.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The possibility of using ammonia (NH3), as a fuel and as an energy carrier with low pollutant emissions, can contribute to the transition to a low-carbon economy. To use ammonia as fuel, knowledge about the NH3 conversion is desired. In particular, the conversion of ammonia under pyrolysis conditions could be determinant in the description of its combustion mechanism. In this work, pyrolysis experiments of ammonia have been performed in both a quartz tubular flow reactor (900-1500 K) and a non-porous alumina tubular flow reactor (900-1800 K) using Ar or N2 as bath gas. An experimental study of the influence of the reactor material (quartz or alumina), the bulk gas (N2 or Ar), the ammonia inlet concentration (1000 and 10a 000 ppm), and the gas residence time [2060/T (K)-8239/T (K) s] on the pyrolysis process has been performed. After the reaction, the resulting compounds (NH3, H2, and N2) are analyzed in a gas chromatograph/thermal conductivity detector chromatograph and an infrared continuous analyzer. Results show that H2 and N2 are the main products of the thermal decomposition of ammonia. Under the conditions of the present work, differences between working in a quartz or non-porous alumina reactor are not significant under pyrolysis conditions for temperatures lower than 1400 K. Neither the bath gas nor the ammonia inlet concentration influence the ammonia conversion values. For a given temperature and under all conditions studied, conversion of ammonia increases with an increasing gas residence time, which results into a narrower temperature window for NH3 conversion.
Fonts, Isabel; Atienza-Martínez, María; Carstensen, Hans-Heinrich; Benés, Mario; Pires, Anamaria Paiva Pinheiro; Garcia-Perez, Manuel; Bilbao, Rafael
Thermodynamic and Physical Property Estimation of Compounds Derived from the Fast Pyrolysis of Lignocellulosic Materials Artículo de revista
En: Energy & Fuels, 2021.
@article{Fonts2021,
title = {Thermodynamic and Physical Property Estimation of Compounds Derived from the Fast Pyrolysis of Lignocellulosic Materials},
author = {Isabel Fonts and María Atienza-Martínez and Hans-Heinrich Carstensen and Mario Benés and Anamaria Paiva Pinheiro Pires and Manuel Garcia-Perez and Rafael Bilbao},
url = {https://pubs.acs.org/doi/full/10.1021/acs.energyfuels.1c01709},
doi = {10.1021/ACS.ENERGYFUELS.1C01709},
year = {2021},
date = {2021-01-01},
journal = {Energy & Fuels},
publisher = {American Chemical Society},
abstract = {The development of biomass pyrolysis oil refineries is a very promising path for the production of biofuels and bioproducts from lignocellulosic materials. Given that bio-oil is a complex mixture o...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The development of biomass pyrolysis oil refineries is a very promising path for the production of biofuels and bioproducts from lignocellulosic materials. Given that bio-oil is a complex mixture o…
2020
Adanez-Rubio, Iñaki; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
Effect of H2S on the S-PAH formation during ethylene pyrolysis Artículo de revista
En: Fuel, vol. 276, pp. 118033, 2020, ISSN: 00162361.
@article{Adanez-Rubio2020a,
title = {Effect of H2S on the S-PAH formation during ethylene pyrolysis},
author = {Iñaki Adanez-Rubio and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1016/j.fuel.2020.118033},
issn = {00162361},
year = {2020},
date = {2020-09-01},
journal = {Fuel},
volume = {276},
pages = {118033},
publisher = {Elsevier Ltd},
abstract = {The effect of the H2S presence on the formation of six different sulphurated polycyclic hydrocarbons (S-PAH), during the pyrolysis of ethylene-H2S mixtures, has been studied in a tubular flow reactor installation. Experiments with different inlet H2S concentrations (0.3, 0.5 and 1%) and temperatures of reaction (between 1075 and 1475 K) have been carried out. The 16 compounds that the Environmental Protection Agency (EPA) has stated as EPA-PAH priority pollutants were also analysed. EPA-PAH compounds were the majority of quantified PAH, and also S-PAH were found and quantified. For temperatures studied, the S-PAH/EPA-PAH ratio values showed a maximum value at 1075 K and a minimum value at 1175 K. With respect to the effect of the inlet concentration of H2S, the S-PAH/EPA-PAH ratio values increased with the increase of the H2S concentration.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The effect of the H2S presence on the formation of six different sulphurated polycyclic hydrocarbons (S-PAH), during the pyrolysis of ethylene-H2S mixtures, has been studied in a tubular flow reactor installation. Experiments with different inlet H2S concentrations (0.3, 0.5 and 1%) and temperatures of reaction (between 1075 and 1475 K) have been carried out. The 16 compounds that the Environmental Protection Agency (EPA) has stated as EPA-PAH priority pollutants were also analysed. EPA-PAH compounds were the majority of quantified PAH, and also S-PAH were found and quantified. For temperatures studied, the S-PAH/EPA-PAH ratio values showed a maximum value at 1075 K and a minimum value at 1175 K. With respect to the effect of the inlet concentration of H2S, the S-PAH/EPA-PAH ratio values increased with the increase of the H2S concentration.
Colom-Díaz, Juan Manuel; Leciñena, M; Peláez, A; Abián, María; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
Study of the conversion of CH4/H2S mixtures at different pressures Artículo de revista
En: Fuel, vol. 262, pp. 116484, 2020, ISSN: 00162361.
@article{Colom-Diaz2020,
title = {Study of the conversion of CH4/H2S mixtures at different pressures},
author = {Juan Manuel Colom-Díaz and M Leciñena and A Peláez and María Abián and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1016/j.fuel.2019.116484},
issn = {00162361},
year = {2020},
date = {2020-02-01},
journal = {Fuel},
volume = {262},
pages = {116484},
publisher = {Elsevier Ltd},
abstract = {Due to the different scenarios where sour gas is present, its composition can be different and, therefore, it can be exploited through different processes, being combustion one of them. In this context, this work deals with the oxidation of CH4 and H2S at different pressures and under a wide variety of conditions. The oxidation has been evaluated experimentally in two different flow reactor set-ups, one working at atmospheric pressure and another one operating from atmospheric to high pressures (40 bar). Different CH4/H2S mixtures have been tested, together with different oxygen concentrations and in the temperature range of 500–1400 K. The experimental results obtained show that the oxidation of the CH4/H2S mixtures is shifted to lower temperatures as pressure increases, obtaining the same trends at atmospheric pressure in both experimental set-ups. H2S oxidation occurs prior to CH4 oxidation at all conditions, providing radicals to the system that promote CH4 oxidation to lower temperatures (compared to neat CH4 oxidation). This effect is more relevant as pressure increases. H2S oxidation is inhibited by CH4 at atmospheric pressure, being more noticeable when the CH4/H2S ratio is higher. At higher pressures, the H2S conversion occurs similarly in the absence or presence of CH4. The experimental results have been modeled with an updated kinetic model from previous works from the literature, which, in general, matches well the experimental trends, while some discrepancies between experimental and modeling results at atmospheric pressure and 40 bar are found in the conversion of H2S and CH4.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Due to the different scenarios where sour gas is present, its composition can be different and, therefore, it can be exploited through different processes, being combustion one of them. In this context, this work deals with the oxidation of CH4 and H2S at different pressures and under a wide variety of conditions. The oxidation has been evaluated experimentally in two different flow reactor set-ups, one working at atmospheric pressure and another one operating from atmospheric to high pressures (40 bar). Different CH4/H2S mixtures have been tested, together with different oxygen concentrations and in the temperature range of 500–1400 K. The experimental results obtained show that the oxidation of the CH4/H2S mixtures is shifted to lower temperatures as pressure increases, obtaining the same trends at atmospheric pressure in both experimental set-ups. H2S oxidation occurs prior to CH4 oxidation at all conditions, providing radicals to the system that promote CH4 oxidation to lower temperatures (compared to neat CH4 oxidation). This effect is more relevant as pressure increases. H2S oxidation is inhibited by CH4 at atmospheric pressure, being more noticeable when the CH4/H2S ratio is higher. At higher pressures, the H2S conversion occurs similarly in the absence or presence of CH4. The experimental results have been modeled with an updated kinetic model from previous works from the literature, which, in general, matches well the experimental trends, while some discrepancies between experimental and modeling results at atmospheric pressure and 40 bar are found in the conversion of H2S and CH4.