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A proposed novel combined milling and combustion performance model for fuel selection (2025)
Journal Article
Williams, O., Nichols, D., Güleç, F., Perkins, J., & Lester, E. (2025). A proposed novel combined milling and combustion performance model for fuel selection. Journal of the Energy Institute, 120, Article 102046. https://doi.org/10.1016/j.joei.2025.102046

This paper presents for the first time the development and evaluation of novel combined milling performance metric and a burnout prediction tool. Pistachio shells, walnut shell, rice husks, and palm kernel shells and wood pellets were milled in a ver... Read More about A proposed novel combined milling and combustion performance model for fuel selection.

Chemical looping combustion of low-volatile semi-anthracite coal with Co-based metal oxide: Performances, kinetics, and mechanisms (2025)
Journal Article
Güleç, F., & Okolie, J. A. (2025). Chemical looping combustion of low-volatile semi-anthracite coal with Co-based metal oxide: Performances, kinetics, and mechanisms. Journal of the Energy Institute, 119, Article 101993. https://doi.org/10.1016/j.joei.2025.101993

The kinetics of Chemical Looping Combustion (CLC) using Co3O4 as an oxygen carrier for low-volatile semi-anthracite coal were studied with the aim of integrating CO2 capture into the combustion process. The effectiveness of varying temperature regime... Read More about Chemical looping combustion of low-volatile semi-anthracite coal with Co-based metal oxide: Performances, kinetics, and mechanisms.

Kinetic analysis of solid fuel combustion in chemical looping for clean energy conversion (2024)
Journal Article
Güleç, F. (2024). Kinetic analysis of solid fuel combustion in chemical looping for clean energy conversion. Fuel, 378, Article 132911. https://doi.org/10.1016/j.fuel.2024.132911

Chemical looping combustion (CLC) offers an advanced, eco-friendly method for converting solid fuels into energy with inherent CO2 capture, presenting a cost-efficient solution. The kinetics of solid fuel CLC, crucial for reactor design, are not well... Read More about Kinetic analysis of solid fuel combustion in chemical looping for clean energy conversion.

Status and Progress of Nanomaterials Application in Hydrogen Storage (2024)
Book Chapter
Güleç, F., Oakley, W., Liu, X., Nayebossadri, S., Wang, F., Smith, E. K., Barakat, S. M., & Lester, E. H. (2024). Status and Progress of Nanomaterials Application in Hydrogen Storage. In J. A. Okolie, E. I. Epelle, A. Mukherjee, & A. El Din Mahmoud (Eds.), Nanomaterials for Sustainable Hydrogen Production and Storage (136-165). CRC Press. https://doi.org/10.1201/9781003371007-8

Hydrogen could be one of the long-term environmentally friendly solutions for a sustainable and clean energy future. The fundamental elements of a hydrogen economy are sustainable and clean hydrogen production, low-cost/high-capacity storage, wide di... Read More about Status and Progress of Nanomaterials Application in Hydrogen Storage.

Generalizability of empirical correlations for predicting higher heating values of biomass (2024)
Journal Article
Daskin, M., Erdoğan, A., Güleç, F., & Okolie, J. A. (2024). Generalizability of empirical correlations for predicting higher heating values of biomass. Energy Sources, Part A, 46(1), 5434-5450. https://doi.org/10.1080/15567036.2024.2332472

Designing efficient biomass energy systems requires a thorough understanding of the physicochemical, thermodynamic, and physical properties of biomass. One crucial parameter in assessing biomass energy potential is the higher heating value (HHV), whi... Read More about Generalizability of empirical correlations for predicting higher heating values of biomass.

A CFD study on the start-up hydrodynamics of fluid catalytic cracking regenerator integrated with chemical looping combustion (2024)
Journal Article
Erdoğan, A., & Güleç, F. (in press). A CFD study on the start-up hydrodynamics of fluid catalytic cracking regenerator integrated with chemical looping combustion. Energy Sources, Part A, 46(1), 2941-2956. https://doi.org/10.1080/15567036.2024.2311327

The integration of chemical looping combustion with fluid catalytic cracking (CLC-FCC) is an innovative concept that serves as a cost-effective method for CO2 capture in refineries. This approach has the potential to reduce refinery CO2 emissions by... Read More about A CFD study on the start-up hydrodynamics of fluid catalytic cracking regenerator integrated with chemical looping combustion.

Exploring the Utilisation of Natural Biosorbents for Effective Methylene Blue Removal (2023)
Journal Article
Güleç, F., Williams, O., Samson, A., Kostas, E., Stevens, L. A., & Lester, E. (2023). Exploring the Utilisation of Natural Biosorbents for Effective Methylene Blue Removal. Applied Sciences, 14(1), Article 81. https://doi.org/10.3390/app14010081

This paper presents a comprehensive analysis of the adsorbent capacity of five distinctly different biosorbents derived from untreated biomasses. The optimal adsorption capacity of seaweed (Laminaria digitata), horse chestnut husk, hazelnut husk, rap... Read More about Exploring the Utilisation of Natural Biosorbents for Effective Methylene Blue Removal.

Utilisation of coal tar naphthalene oil fractions for the synthesis of value-added chemicals: alternative paths to mono- and di-methylnaphthalenes (2023)
Journal Article
Güleç, F., Koçkan, A., & Karaduman, A. (2023). Utilisation of coal tar naphthalene oil fractions for the synthesis of value-added chemicals: alternative paths to mono- and di-methylnaphthalenes. Research on Chemical Intermediates, 50(2), 881-903. https://doi.org/10.1007/s11164-023-05158-5

This study investigates the utilisation of coal tar naphthalene oil fraction (CTNOF), an economical by-product derived from the iron-steel industry, for the production of valuable chemicals, with a particular focus on methylnaphthalenes (MNs) and dim... Read More about Utilisation of coal tar naphthalene oil fractions for the synthesis of value-added chemicals: alternative paths to mono- and di-methylnaphthalenes.

Progress in lignocellulosic biomass valorization for biofuels and value‐added chemical production in the EU: A focus on thermochemical conversion processes (2023)
Journal Article
Güleç, F., Parthiban, A., Umenweke, G. C., Musa, U., Williams, O., Mortezaei, Y., Suk‐Oh, H., Lester, E., Ogbaga, C. C., Gunes, B., & Okolie, J. A. (2023). Progress in lignocellulosic biomass valorization for biofuels and value‐added chemical production in the EU: A focus on thermochemical conversion processes. Biofuels, Bioproducts and Biorefining, https://doi.org/10.1002/bbb.2544

The demand for sustainable energy sources has increased owing to environmental concerns, such as climate change, rising energy demand and rapid industrialization. Biomass utilization for bioenergy and value‐added chemical production has become essent... Read More about Progress in lignocellulosic biomass valorization for biofuels and value‐added chemical production in the EU: A focus on thermochemical conversion processes.

Decarbonising bioenergy through biomass utilisation in chemical looping combustion and gasification: a review (2023)
Journal Article
Güleç, F., & Okolie, J. A. (2024). Decarbonising bioenergy through biomass utilisation in chemical looping combustion and gasification: a review. Environmental Chemistry Letters, 22, 121-147. https://doi.org/10.1007/s10311-023-01656-5

Biomass valorisation for bioenergy is crucial for establishing a sustainable low-carbon circular bioeconomy and addressing societal and environmental challenges. As global demand for renewable energy grows, effective waste management using biomass be... Read More about Decarbonising bioenergy through biomass utilisation in chemical looping combustion and gasification: a review.

Sustainability of bioenergy – Mapping the risks & benefits to inform future bioenergy systems (2023)
Journal Article
Welfle, A. J., Almena, A., Arshad, M. N., Banks, S. W., Butnar, I., Chong, K. J., Cooper, S. J., Daly, H., Garcia Freites, S., Güleç, F., Hardacre, C., Holland, R., Lan, L., Lee, C. S., Robertson, P., Rowe, R., Shepherd, A., Skillen, N., Tedesco, S., Thornley, P., …Röder, M. (2023). Sustainability of bioenergy – Mapping the risks & benefits to inform future bioenergy systems. Biomass and Bioenergy, 177, Article 106919. https://doi.org/10.1016/j.biombioe.2023.106919

Bioenergy is widely included in energy strategies for its GHG mitigation potential. Bioenergy technologies will likely have to be deployed at scale to meet decarbonisation targets, and consequently biomass will have to be increasingly grown/mobilised... Read More about Sustainability of bioenergy – Mapping the risks & benefits to inform future bioenergy systems.

Techno-economic feasibility of fluid catalytic cracking unit integrated chemical looping combustion – A novel approach for CO2 capture (2023)
Journal Article
Güleç, F., Okolie, J. A., & Erdogan, A. (2023). Techno-economic feasibility of fluid catalytic cracking unit integrated chemical looping combustion – A novel approach for CO2 capture. Energy, 284, Article 128663. https://doi.org/10.1016/j.energy.2023.128663

Oil refineries are collectively responsible for about 4–6% of the global CO2 emissions, largely because of the regenerator part of the Fluid Catalytic Cracking (FCC) unit (25–35%). An advanced combustion technology, also called chemical looping combu... Read More about Techno-economic feasibility of fluid catalytic cracking unit integrated chemical looping combustion – A novel approach for CO2 capture.

Low-temperature chemical looping oxidation of hydrogen for space heating (2023)
Journal Article
Güleç, F., Okolie, J. A., Clough, P. T., Erdogan, A., Meredith, W., & Snape, C. E. (2023). Low-temperature chemical looping oxidation of hydrogen for space heating. Journal of the Energy Institute, 110, Article 101355. https://doi.org/10.1016/j.joei.2023.101355

Chemical looping combustion (CLC) is an advanced combustion process in which the combustion reaction splits into two parts; in the first reaction metal oxides are used as oxygen suppliers for fuel combustion and then in the second reaction, reduced m... Read More about Low-temperature chemical looping oxidation of hydrogen for space heating.

A comprehensive analysis on the synthesis of value-added chemicals via slow pyrolysis: Valorisation of rapeseed residue, whitewood, and seaweed (Laminaria digitata) (2023)
Journal Article
Güleç, F., Sudibyo, H., Kostas, E. T., Williams, O., Samson, A., Meredith, W., & Lester, E. (2023). A comprehensive analysis on the synthesis of value-added chemicals via slow pyrolysis: Valorisation of rapeseed residue, whitewood, and seaweed (Laminaria digitata). Journal of Analytical and Applied Pyrolysis, 173, Article 106093. https://doi.org/10.1016/j.jaap.2023.106093

Pyrolysis has emerged as a crucial thermochemical conversion technology in the field of biomass processing. Maximising the valorisation of biomass is an essential area of investigation, as it plays a pivotal role in understanding the economic viabili... Read More about A comprehensive analysis on the synthesis of value-added chemicals via slow pyrolysis: Valorisation of rapeseed residue, whitewood, and seaweed (Laminaria digitata).

Multi-criteria decision analysis for the evaluation and screening of sustainable aviation fuel production pathways (2023)
Journal Article
Okolie, J. A., Awotoye, D., Tabat, M. E., Okoye, P. U., Epelle, E. I., Ogbaga, C. C., Güleç, F., & Oboirien, B. (2023). Multi-criteria decision analysis for the evaluation and screening of sustainable aviation fuel production pathways. iScience, 26(6), Article 106944. https://doi.org/10.1016/j.isci.2023.106944

The aviation sector, a significant greenhouse gas emitter, must lower its emissions to alleviate the climate change impact. Decarbonization can be achieved by converting low-carbon feedstock to sustainable aviation fuel (SAF). This study reviews SAF... Read More about Multi-criteria decision analysis for the evaluation and screening of sustainable aviation fuel production pathways.

Process modelling integrated with interpretable machine learning for predicting hydrogen and char yield during chemical looping gasification (2023)
Journal Article
Sison, A. E., Etchieson, S. A., Güleç, F., Epelle, E. I., & Okolie, J. A. (2023). Process modelling integrated with interpretable machine learning for predicting hydrogen and char yield during chemical looping gasification. Journal of Cleaner Production, 414, Article 137579. https://doi.org/10.1016/j.jclepro.2023.137579

Chemical looping gasification (CLG) is a promising thermochemical process for the production of H2. CLG process is mainly based on oxygen transfer from an air reactor to a gasification reactor using solid metal oxides (also called oxygen carriers, (O... Read More about Process modelling integrated with interpretable machine learning for predicting hydrogen and char yield during chemical looping gasification.

Pathways for the Valorization of Animal and Human Waste to Biofuels, Sustainable Materials, and Value-Added Chemicals (2023)
Journal Article
Okolie, J. A., Jimoh, T., Akande, O., Okoye, P. U., Ogbaga, C. C., Adeleke, A. A., Ikubanni, P. P., Güleç, F., & Amenaghawon, A. N. (2023). Pathways for the Valorization of Animal and Human Waste to Biofuels, Sustainable Materials, and Value-Added Chemicals. Environments, 10(3), Article 46. https://doi.org/10.3390/environments10030046

Human and animal waste, including waste products originating from human or animal digestive systems, such as urine, feces, and animal manure, have constituted a nuisance to the environment. Inappropriate disposal and poor sanitation of human and anim... Read More about Pathways for the Valorization of Animal and Human Waste to Biofuels, Sustainable Materials, and Value-Added Chemicals.

Pathways for the Valorization of Animal and Human Waste to Biofuels, Sustainable Materials and Value-Added Chemicals (2023)
Preprint / Working Paper
Okolie, J. A., Jimoh, T., Akande, O., Okoye, P. U., Ogbaga, C. C., Adeleke, A. A., Ikubanni, P. P., Gulec, F., & Nosakhare Amenaghawon, A. Pathways for the Valorization of Animal and Human Waste to Biofuels, Sustainable Materials and Value-Added Chemicals

Human and animal waste, including waste products originating from human or animal digestive systems such as urine, feces, and animal manure, have constituted a nuisance to the environment. Inappropriate disposal and poor sanitation of human and anima... Read More about Pathways for the Valorization of Animal and Human Waste to Biofuels, Sustainable Materials and Value-Added Chemicals.

Process design, exergy, and economic assessment of a conceptual mobile autothermal methane pyrolysis unit for onsite hydrogen production (2023)
Journal Article
Tabat, M. E., Omoarukhe, F. O., Güleç, F., Adeniyi, D. E., Mukherjee, A., Okoye, P. U., Ogbaga, C. C., Epelle, E. I., Akande, O., & Okolie, J. A. (2023). Process design, exergy, and economic assessment of a conceptual mobile autothermal methane pyrolysis unit for onsite hydrogen production. Energy Conversion and Management, 278, Article 116707. https://doi.org/10.1016/j.enconman.2023.116707

The present study proposes a conceptual mobile autothermal methane pyrolysis unit for onsite hydrogen production. Considering the shortage of hydrogen pipeline infrastructure between production plants and fuelling stations in most places where hydrog... Read More about Process design, exergy, and economic assessment of a conceptual mobile autothermal methane pyrolysis unit for onsite hydrogen production.