Grupos de Investigación



Xu Y., Borrego A.G., Planes A., Ding X., Vives E. Criticality in failure under compression: Acoustic emission study of coal and charcoal with diferent microstructures. Physical Reviews E 40, 1-12 (2019).DOI: 10.1103/PhysRevE.99.033001

Borrego, AG; López García, A. Merino-Tomé O. Petrographic and geochemical characterization of organic-rich Mississippian black shales in the north of Spain: Vegamián Formation, Cantabrian Zone. International journal of coal geology 190, 126-145 (2018) DOI:

Gómez-Rojas OP; Borrego AG; Perea-Solano C.; Sánchez-Morales OA; Flórez-Molano H.F. Caracterización preliminar de las arenas asfálticas de Picacho, municipio de Pesca (Boyacá, Colombia). Boletin de Geología 40, 87-99 (2018). DOI:


Suarez-Ruiz, I; Valentim, B; Borrego, AG; Bouzinos, A ; Flores, D; Kalaitzidis, S; Malinconico, ML; Marques, M; Misz-Kennan, M; Predeanu, G; Montes, JR; Rodrigues, S; Siavalas, G; Wagner, N Development of a petrographic classification of fly-ash components from coal combustion and co-combustion. (An ICCP Classification System, Fly-Ash Working Group – Commission III.). International journal of coal geology 183, 188-203 (2017) DOI: 10.1016/j.coal.2017.06.004

B.D. Flores, A.G. Borrego, M.A. Díez, G.L.R. da Silva, V. Zymla, A.C.F. Vilela, E. Osório. How coke optical texture became a relevant tool for understanding coal blending and coke quality. Fuel Processing Technology 165, 13-23 (2017)

Lorenzo E., Borrego A.G., Marquez G, Gonzalez F., Moreno C., Petrography, biomarker composition, mineralogy, inorganic geochemistry and paleodepositional environment of coals from La Ballesta mine, Peñarroya Basin, Spain. Journal of Iberian Geology 43, 13-32 (2017) DOI 10.1007/s41513-017-0002-x

Pohlmann J., Osorio E., Vilela A.C.F., .Díez M.A., Borrego A.G., Pulverized combustion under conventional (O2/N2) and oxy-fuel (O2/CO2) conditions of biomasses treated at different temperatures. Fuel Processing Technology 155, 174-182 (2017).

Flores B.D., Flores I.V., Guerrero A.,Orellana D.R., Pohlmann J., Díez M.A., Borrego A.G., Osorio E., Vilela A.C.F. Effect of charcoal blending with a vitrinite rich coking coal on coke reactivity. Fuel Processing Technology 155, 97-105 (2017).

Flores B.D., Guerrero A., Flores I.V., Borrego A.G., Díez M.A., Osorio E., Vilela A.C.F. On the reduction behavior, structural and mechanical features of iron ore-carbon briquettes. Fuel Processing Technology 155, 238-245 (2017).

Borrego, AG; A dry polishing technique for the petrographic examination of mudrocks: Discussion. International journal of coal geology 183, 136-137 (2017) DOI:

Ortiz J. E., Borrego A.G., Gallego JLR, Sánchez-Palencia Y, Urbanczyk J.,Torres T, Domingo L., Estébanez B. Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain). Organic Geochemistry 95, 41-54 (2017).

Urbanczyk J., Bechtel A., Borrego A.G. Organic geochemical evidence of postglacial paleoenvironmental evolution of the Comeya peatland (Asturias, N Spain). International Journal of Coal Geology 168, 46-54 (2017)


López-Días V., Urbanczyk J., Blanco C.G., Borrego Á.G. Maceral composition and molecular markers of two condensed Middle Holocene peat deposits in N Spain. International Journal of Coal Geology 168, 55-70 (2016)

Pohlmann JG, Borrego AG, Osório E., Diez MA, Vilela ACF. Combustion of eucalyptus charcoals and coals of similar volatile yields aiming at blast furnace injection in a CO2 mitigation environment. Journal of Cleaner Production 129, 1-11 (2016). doi:10.1016/j.jclepro.2016.04.138


Hackley, P.; Borrego, A. G.; Bouzinos A., Cardott, B.; Cook A.C., Eble C. Flores, D.; Gentzis T. Gonçalves, P.A.; Mendonça Filho, J.G.; Hamor-Vidó M., Jelonek I, Kommeren, Kees, Knowles W., Kus J, Mastalerz, M.; Menezes, T. R.; Newman, J.; Pawlewicz M., Pickel W., Potter J., Ranasinghe P., Read H., Reyes J., de la Rosa G., Souza, I. V. A. F.; Suarez-Ruiz, I; Sykorova I., Valentine B.J. Petrographic maturity parameters of a Devonian shale maturation series, Appalachian Basin, USA. ICCP Thermal Indices Working Group interlaboratory exercise. Marine and Petroleum Geology 59, 22-34 (2015)doi:10.1016/j.marpetgeo.2014.07.015

Smatanová N., Borrego A.G., Diez M.A. Thermal behaviour of woody biomass and its relevance to coal thermoplasticity. International Journal of Chemical & Petrochemical Technology(IJCPT) 5, 9-16 (2015). ISSN(P): 2277-4807

Guerrero A., Diez M.A., Borrego A.G. Influence of charcoal fines on the thermoplastic properties of coking coals and the optical properties of the semicoke. International Journal of Coal Geology. 147–148, 105-114 (2015). doi: 10.1016/j.coal.2015.06.013

Preadeanu G., Panaitescu C., Bălănescu M., Bieg G., Borrego A.G., Diez M.A., Hackley P., Kwiecińska B., Marques M., Mastalerz M., Misz-Kennan M., Pusz S., Suárez Ruiz I., Rodrigues S., Singh A.K., Varma A.K., Zdravkov A., Životić D. Microscopical characterization of carbon materials derived from coal and petroleum and their interaction phenomena in making steel electrodes, anodes and cathode blocks for the microscopy of carbon materials working group of the ICCP. International Journal of Coal Geology 139, 63-79 (2015). http://dx.doi: 10.1016/j.coal.2014.07.011


Urbanczyk J., Fernandez Casado M.A., Díaz T.E., Heras P, Infante M, Borrego A.G. Spectral fluorescence variability of pollen and spores from recent peat-forming plants. International Journal of Coal Geology 131, 263-274 (2014).

Toufiq Reza M., Borrego A. G., Wirth B. Optical texture of hydrochar from maize silage and maize silage digestate. International Journal of Coal Geology134-135, 74-79 (2014). doi: 10.1016/j.coal.2014.09.015

Pusz S., Borrego A.G., Alvarez D., Camean I., du Cann V., Duber S., Kalkreuth W., Komorek J., Kus J., Kwiecińska B.K., Libera M., Marques M., Misz-Kennan M., Morga R., Rodrigues S., Smędowski Ł., Suarez-Ruiz I., Strzezik J. Application of reflectance parameters in the estimation of the structural order of coals and carbonaceous materials. Precision and bias of measurements derived from the ICCP structural working group. International Journal of Coal Geology 131, 147-161 (2014).

Pohlmann, J. G.; Osório, E.;. Vilela A. C. F.; Diez, M.A.; Borrego, A. G. Integrating physicochemical information to follow the transformations of biomass upon torrefaction and low-temperature carbonization. Fuel 131, 17-27 (2014)


Borrego A.G., Patrick JW. Ed. Advances in Coal Science and Technology ICCS&T 2011. Fuel 114, 1-244 (2013) Ed

Diez M.A., Borrego A.G. Evaluation of CO2-reactivity patterns in cokes from coal and woody biomass blends. Fuel 113, 59-68 (2013). DOI:10.1016/j.fuel.2012.05.023 (2012)

López Dias V., Urbanczyk J., Blanco C.G., Borrego A.G. Biomarkers as palaeoclimate proxies in peatlands from coastal high plains in Asturias, N Spain. International Journal of Coal Geology 116-117, 270-280 (2013)

López Dias V., Blanco C.G., Bechtel A., Püttmann W., Borrego A.G. Different source of n-alkanes and n-alkane-2-ones in a 6000 cal. yr BP peat bog (Roñanzas, N Spain). Organic Geochemistry 57, 7-10 (2013)

López Dias V, Urbanczyk J, Blanco CG, Borrego AG. Biomarkers as palaeoclimate proxies in peatlands from coastal high plains in Asturias, N Spain. Int J Coal Geol 116-117, 270-280 2013

López Dias V, Blanco CG, Bechtel A, Püttmann W, Borrego AG. Different source of n-alkanes and n-alkane-2-ones in a 6000 cal. yr BP peat bog (Roñanzas, N Spain). Org. Geochem. 57, 7-10 2013


Guerrero A., Diez M.A., Borrego A.G. Effect of volatile matter release on optical properties of macerals from different rank coals. Fuel 114, 21-31 (2013). DOI:10.1016/j.fuel.2012.05.023 (2012)


Luzón, M.A.; Pérez, A.; Borrego, A.G.; Mayayo, M.J.; Soria, A.R. Interrelated continental sedimentary environments in the central Iberian Range (Spain): Facies characterization and main palaeoenvironmental changes during the Holocene. Sedimentary Geology 239 , 87-103 (2011).


López-Días V., Borrego Á.G., Blanco C.G. Vertical evolution of petrographic and organic geochemical parameters in Las Dueñas mire (Cantabrian Coast, North Spain). Int. J. Coal Geol. 84, 179-189 (2010)

Mendonça Filho, J.G.; Araujo, C. V.; Borrego, A. G.; Cook, A.; Flores, D.; Hackley, P.; Hower, J.; Kern, M. L.; Kommeren, C.J.; Kus, J.; Mastalerz, M.; Mendonça, J.O.; Menezes, T. R.; Newman, J.; Ranasinghe, P.; Souza, I. V. A. F.; Suarez-Ruiz, I; Ujiié, Y. Effect of concentration on maturity optical parameters of dispersed organic components. Interlaboratory results of the organic matter concentration working group of the ICCP. Int. J. Coal Geol. 84, 154-165 (2010).

López-Días V., Borrego Á.G., Blanco C.G., Arboleya M., López-Sáez J.A., López-Merino L. Biomarkers in a peat deposit in Northern Spain (Huelga de Bayas, Asturias) as proxy for climate variation. Journal of Chromatography A, 1217, 3538-3546 (2010).

J. Fermoso, M. V. Gil, A. G. Borrego, C. Pevida, J. J. Pis, and F. Rubiera. Effect of the Pressure and Temperature of Devolatilization on the Morphology and Steam Gasification Reactivity of Coal Chars. Energy Fuels 24, 5586-5595 (2010)

Pohlmann, J. G.; Borrego, A. G.; Vilela A. C. F.; Osório, E. Reactivity to CO2 of chars prepared in O2/N2 and O2/CO2 mixtures for pulverized coal injection (PCI) in blast furnace in relation to char petrographic characteristics. Int. J. Coal Geol. 84, 293-300 (2010)

Lester E., Alvarez D., Borrego A.G., Valentim B., Flores D., Clift D.A., Rosenberg P., Kwiecinska B., Barranco R., Petersen H.I., Mastalerz M., Milenkova K.S., Panaitescu C., Marques M.M, Thompson A., Watts D., Hanson S., Predeanu G., Misz M., Wu T. The procedure used to develop a coal char classification—Commission III Combustion Working Group of the International Committee for Coal and Organic Petrology. Int. J. Coal Geol. 81, 333-342 (2010)

Borrego A.G., Martín, A.J. Variation in the structure of anthracite at a fast heating rate as determined by its optical properties: An example of oxy-combustion conditions in a drop tube reactor. Int. J. Coal Geol. 81, 301-308, (2010)


Borrego A.G., Garavaglia L., Kalkreuth W.D. Characteristic of biomass chars generated under pyrolysis and CO2 atmospheres. Int. J. Coal Geol. 77, 409-415 (2009)


Osorio E., Ghiggi L., Vilela ACF, Kalkreuth W., Borrego A.G., Non-isothermal combustion behaviour of coal blends in a thermobalance as seen by optical microscopy. Thermochimica Acta 475, 1-8 (2008)

Borrego A.G., Osório E., Casal M.D.,. Vilela A.C.F. Coal Char Combustion under a CO2-rich Atmosphere. Implications for Pulverized Coal Injection in a Blast Furnace. Fuel Process. Technol. 89, 1017-1024 (2008)


Spears D.A., Borrego A.G., Cox A., Martinez-Tarazona R.M. Use of laser ablation ICP-MS to determine trace element distributions in coals, with special reference to V, Ge and Al. Int J. Coal Geol., 72, 165-176 (2007)

Borrego A.G., Alvarez D. Comparison of chars obtained under oxy-fuel and conventional pulverized coal combustion atmospheres. Energy Fuels 21, 3171-3179 (2007)

Alvarez D., Peña M., Borrego A.G. Behavior of different calcium-based sorbents in a calcination/carbonation cycle for CO2 capture. Energy Fuels, 21, 1534-1542 (2007)

Alvarez D., Borrego A.G. The evolution of char surface area along pulverized fuel combustion. Energy Fuels 21, 1085-1091 (2007)


Osório E., Ilha Gomes M.L.,Vilela ACF, Kalkreuth W., Almeida MAA de, Borrego A.G., Alvarez D. Evaluation of Petrology and Reactivity of Coal Blends for Use in Pulverized Coal Injection (PCI). Int J. Coal Geol., 68, 14-29 (2006)


Alvarez D, Borrego A.G., Apparent vs. True density for the volume-to-weight transformation in coal blends. J. Microscopy , 220, 221-228 (2005)

Milenkova K.S., Borrego A..G., Alvarez D., Menéndez R,. Petersen H.I., Rosemberg P. Coal blending with petroleum coke in a pulverised fuel power plant. Energy Fuels 19, 453-458 (2005)

Kalkreuth W., Borrego A.G., Alvarez D., Menendez R., Osório E., Ribas M., Vilela A., CardozoAlves T. Exploring the possibilities of using Brazilian subbituminous coals for Blast Furnace Pulverized Fuel Injection. Fuel, 84, 763-772.

Ulloa C., Borrego A.G., Helle S., Gordon A.L,. García X, Char characterization and DTF assays as tools to predict burnout of coal Blends in power plants. Fuel 84, 247-257 (2005)


Vassilev S.V., Menendez R., Borrego A.G., Diaz-Somoano M., Martinez-Tarazona M. R. Phase-mineral and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 3. Characterization of magnetic and char concentrates. Fuel 83, 1563-1583(2004)


Milenkova K., Borrego A.G., Alvarez D., Xiberta J., Menéndez R. Tracing back the origin of unburned carbon in fly-ashes from coal blends. Energy Fuels 17, 1222-1232 (2003)

Méndez L.B., Borrego A.G., Martínez-Tarazona R. , Menéndez R. Influence of petrographic and mineral matter composition of coal particles on their combustion reactivity. Fuel 82, 1875-1882 (2003)

Milenkova K., Borrego A.G., Alvarez D., Xiberta J., Menéndez R. Devolatilisation behaviour of petroleum coke under p.f. combustion conditions. Fuel 82, 1883-1891(2003)

Neumann V., Borrego A.G., Cabrera L., Dino R. Organic matter composition and distribution through the Aptian-Albian lacustrine sequences of the Araripe Basin, northeastern Brazil. Int. J. Coal Geol 54, 21-40 (2003)


Alonso M.J.G., Borrego A.G., Alvarez D., Menéndez R. Physicochemical transformations of coal particles during pyrolysis and combustion. Fuel .80, 1857-1870 (2001)

Alonso M.J.G., Alvarez D., Borrego A.G., Menéndez R., Marbán G. Systematics effects of coal rank and type on the kinetics of coal pyrolysis. Energy Fuels. 15, 413-428 (2001)

Alonso M.J.G., Borrego A.G., Alvarez D., Parra J.B., Menéndez R. Influence of pyrolysis temperature on char optical texture and reactivity. J. Anal. Appl. Pyrolysis. 58-59, 887-909 (2001)

Alonso M.J.G., Borrego A.G., Alvarez D., Menéndez R. A reactivity study of chars obtained at different temperatures in relation to their petrographic characteristics. Fuel Procces.Technol. 69,257-272 (2001)


Borrego A.G., Prado J.G., Fuente E., Guillén M.D. and Blanco C.G. Pyrolytic behaviour of Spanish oil shales and their kerogens. J. Anal. Appl. Pyrolysis. 56, 1-21 (2000)

Milenkova K., Borrego A.G., Alvarez D., Xiberta J., Menéndez R. Origen de los inquemados en las cenizas volantes procedentes de la combustión de carbón pulverizado. Revista de Minas 19-20, 33-38 (2000)

Borrego A.G., Marbán G., Alonso M.J.G., Alvarez D., Menéndez R. Maceral effects in the determination of proximate volatiles in coal. Energy Fuels.14, 117-126 (2000)


Alonso M.J.G., Borrego A.G., Alvarez D., Menéndez R. Pyrolysis behaviour of pulverised coals at different temperatures. Fuel. 78, 1501-1513 (1999)


Alvarez D., Borrego A.G., Menendez R. Unbiased methods for the morphological description of char structures. Fuel 76, 1241-1248 (1997)