Call:
Email: juanmcd@unizar.es
Address: Office 41.020. C/Mariano Esquillor s/n, Edificio I+D+i, I3A, Zaragoza, España
ABOUT ME
Research Interests
Chemical processes, combustion, kinetic modeling, sulfur chemistry, biomass, pellets, PAH. My latest work is related to experimental and kinetic modeling of gas-phase chemistry. I am familiar with laboratory reactors (atmospheric and high pressure), some experience with catalysts gained through my Erasmus in Denmark doing the Master Thesis, some knowledge about PAH formation from biomass in a stay in Lisbon at IST and several hours modeling with Chemkin-PRO.
PUBLICATIONS
2019
Colom-Díaz, Juan Manuel; Abián, María; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
Influence of pressure on H2S oxidation. Experiments and kinetic modeling Journal Article
In: Fuel, vol. 258, pp. 116145, 2019, ISSN: 00162361.
@article{Colom-Diaz2019b,
title = {Influence of pressure on H2S oxidation. Experiments and kinetic modeling},
author = {Juan Manuel Colom-Díaz and María Abián and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1016/j.fuel.2019.116145},
issn = {00162361},
year = {2019},
date = {2019-12-01},
journal = {Fuel},
volume = {258},
pages = {116145},
publisher = {Elsevier Ltd},
abstract = {The oxidation of H2S at different manometric pressures (0.6–40 bar), in the temperature range of 500–1000 K and under slightly oxidizing conditions ($łambda$ = 2), has been studied. Experiments have been performed in a quartz tubular flow reactor. The results have shown that H2S conversion shifts to lower temperatures as the pressure increases. The kinetic model used in this work is based on a previous one proposed by the authors to describe H2S oxidation at atmospheric pressure, which has been updated with a H2/O2 reaction subset for high pressures. Model results match fairly well the experimental ones both from the present work and from the literature. The reaction pathways of H2S oxidation analyzed are similar to the ones at atmospheric pressure. The differences are found in the radicals that are involved in the oxidation process at the different pressures. For a given temperature it is shown that, under the operating conditions of this work, pressure will have a major role than the gas residence time in the oxidation rate.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The oxidation of H2S at different manometric pressures (0.6–40 bar), in the temperature range of 500–1000 K and under slightly oxidizing conditions ($łambda$ = 2), has been studied. Experiments have been performed in a quartz tubular flow reactor. The results have shown that H2S conversion shifts to lower temperatures as the pressure increases. The kinetic model used in this work is based on a previous one proposed by the authors to describe H2S oxidation at atmospheric pressure, which has been updated with a H2/O2 reaction subset for high pressures. Model results match fairly well the experimental ones both from the present work and from the literature. The reaction pathways of H2S oxidation analyzed are similar to the ones at atmospheric pressure. The differences are found in the radicals that are involved in the oxidation process at the different pressures. For a given temperature it is shown that, under the operating conditions of this work, pressure will have a major role than the gas residence time in the oxidation rate.
Colom-Díaz, Juan Manuel; Alzueta, María U; Fernandes, Ulisses; Costa, Mário
Emissions of polycyclic aromatic hydrocarbons from a domestic pellets-fired boiler Journal Article
In: Fuel, vol. 247, pp. 108–112, 2019, ISSN: 00162361.
@article{Colom-Diaz2019c,
title = {Emissions of polycyclic aromatic hydrocarbons from a domestic pellets-fired boiler},
author = {Juan Manuel Colom-Díaz and María U Alzueta and Ulisses Fernandes and Mário Costa},
doi = {10.1016/j.fuel.2019.03.049},
issn = {00162361},
year = {2019},
date = {2019-07-01},
journal = {Fuel},
volume = {247},
pages = {108--112},
publisher = {Elsevier Ltd},
abstract = {This work evaluates the emissions of polycyclic aromatic hydrocarbons (PAH) from a domestic pellets-fired boiler. Three biomass residues, pine sawdust, cork residues and kiwi residues, were used in this work. The experiments were carried out at three boiler thermal inputs (10, 14 and 17 kW). The PAHs were collected from the flue gas using a resin (XAD-2) placed inside a narrow tube, located after a quartz microfiber filter that collected the particulate matter, including soot, present in the boiler combustion products. Subsequently, the PAHs were analyzed and quantified combining Soxhlet extraction and gas chromatograph-mass spectrometry. In addition, for each test condition, flue gas concentrations of O2, CO2, CO, hydrocarbons and NOx were also measured to monitor the boiler operation. The results showed that pine sawdust and cork residues firing yielded lower total PAH emissions than kiwi residues firing, and that PAH emissions increase with the increase of the boiler thermal input for pine sawdust and cork residues firing, but decrease for kiwi residues firing. The present PAH emission data are in line with the limited data reported in the literature, and emphasize the need to extend the current data base to encompass other biomass residues, including non-woody residues.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This work evaluates the emissions of polycyclic aromatic hydrocarbons (PAH) from a domestic pellets-fired boiler. Three biomass residues, pine sawdust, cork residues and kiwi residues, were used in this work. The experiments were carried out at three boiler thermal inputs (10, 14 and 17 kW). The PAHs were collected from the flue gas using a resin (XAD-2) placed inside a narrow tube, located after a quartz microfiber filter that collected the particulate matter, including soot, present in the boiler combustion products. Subsequently, the PAHs were analyzed and quantified combining Soxhlet extraction and gas chromatograph-mass spectrometry. In addition, for each test condition, flue gas concentrations of O2, CO2, CO, hydrocarbons and NOx were also measured to monitor the boiler operation. The results showed that pine sawdust and cork residues firing yielded lower total PAH emissions than kiwi residues firing, and that PAH emissions increase with the increase of the boiler thermal input for pine sawdust and cork residues firing, but decrease for kiwi residues firing. The present PAH emission data are in line with the limited data reported in the literature, and emphasize the need to extend the current data base to encompass other biomass residues, including non-woody residues.
Colom-Díaz, Juan Manuel; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
High pressure study of H 2 oxidation and its interaction with NO Journal Article
In: International Journal of Hydrogen Energy, vol. 44, no. 12, pp. 6325–6332, 2019, ISSN: 03603199.
@article{Colom-Diaz2019a,
title = {High pressure study of H 2 oxidation and its interaction with NO},
author = {Juan Manuel Colom-Díaz and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1016/j.ijhydene.2019.01.078},
issn = {03603199},
year = {2019},
date = {2019-03-01},
journal = {International Journal of Hydrogen Energy},
volume = {44},
number = {12},
pages = {6325--6332},
publisher = {Elsevier Ltd},
abstract = {The present study deals with the oxidation of H 2 at high pressure and its interaction with NO. The high pressure behavior of the H 2 /NO x /O 2 system has been tested over a wide range of temperatures (500–1100 K) and different air excess ratios ($łambda$ = 0.5–6.4). The experiments have been carried out in a tubular flow reactor at 10, 20 and 40 bar NO has been found to promote H 2 oxidation under oxidizing conditions, reacting with HO 2 radicals to form the more active OH radical, which enhances the conversion of hydrogen. The onset temperature for hydrogen oxidation, when doped with NO, was approximately the same at all stoichiometries at high pressures (40 bar), and shifted to higher temperatures as the pressure decreases. The experimental results have been analyzed with an updated kinetic model. The reaction NO+NO+O 2 ⇌NO 2 +NO 2 has been found to be important at all conditions studied and its kinetic parameters have been modified, according to its activation energy uncertainty. Furthermore, the kinetic parameters of reactionHNO+H 2 ⇌NH+H 2 O have been estimated, in order to obtain a good prediction of the oxidation behavior of H 2 and NO conversion under reducing conditions. The kinetic model shows a good agreement between experimental results and model predictions over a wide range of conditions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The present study deals with the oxidation of H 2 at high pressure and its interaction with NO. The high pressure behavior of the H 2 /NO x /O 2 system has been tested over a wide range of temperatures (500–1100 K) and different air excess ratios ($łambda$ = 0.5–6.4). The experiments have been carried out in a tubular flow reactor at 10, 20 and 40 bar NO has been found to promote H 2 oxidation under oxidizing conditions, reacting with HO 2 radicals to form the more active OH radical, which enhances the conversion of hydrogen. The onset temperature for hydrogen oxidation, when doped with NO, was approximately the same at all stoichiometries at high pressures (40 bar), and shifted to higher temperatures as the pressure decreases. The experimental results have been analyzed with an updated kinetic model. The reaction NO+NO+O 2 ⇌NO 2 +NO 2 has been found to be important at all conditions studied and its kinetic parameters have been modified, according to its activation energy uncertainty. Furthermore, the kinetic parameters of reactionHNO+H 2 ⇌NH+H 2 O have been estimated, in order to obtain a good prediction of the oxidation behavior of H 2 and NO conversion under reducing conditions. The kinetic model shows a good agreement between experimental results and model predictions over a wide range of conditions.
Colom-Díaz, Juan Manuel; Abián, María; Ballester, M Y; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
H 2 S conversion in a tubular flow reactor: Experiments and kinetic modeling Journal Article
In: Proceedings of the Combustion Institute, vol. 37, no. 1, pp. 727–734, 2019, ISSN: 15407489.
@article{Colom-Diaz2019d,
title = {H 2 S conversion in a tubular flow reactor: Experiments and kinetic modeling},
author = {Juan Manuel Colom-Díaz and María Abián and M Y Ballester and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1016/j.proci.2018.05.005},
issn = {15407489},
year = {2019},
date = {2019-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {37},
number = {1},
pages = {727--734},
publisher = {Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Colom-Díaz, Juan Manuel; Abián, María; Ballester, M Y; Millera, Ángela; Bilbao, Rafael; Alzueta, María U
H 2 S conversion in a tubular flow reactor: Experiments and kinetic modeling Journal Article
In: Proceedings of the Combustion Institute, vol. 37, no. 1, pp. 727–734, 2019, ISSN: 15407489.
@article{Colom-Diaz2019e,
title = {H 2 S conversion in a tubular flow reactor: Experiments and kinetic modeling},
author = {Juan Manuel Colom-Díaz and María Abián and M Y Ballester and Ángela Millera and Rafael Bilbao and María U Alzueta},
doi = {10.1016/j.proci.2018.05.005},
issn = {15407489},
year = {2019},
date = {2019-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {37},
number = {1},
pages = {727--734},
publisher = {Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}