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https://doi.org/10.53941/gefr.2025.100006
Chih, Y.-K., Kuo, S.-R., & Wang, J.-J. Advancing Hydrogen Development from 2015 to 2024 and Mitigating Noₓ Emissions from Hydrogen-Enriched Combustion for a Cleaner Energy Future. Green Energy and Fuel Research. 2025, 2(1), 64–76. doi: https://doi.org/10.53941/gefr.2025.100006
Volume 2, Issue 1, 2025
Copyright (c) 2025 by the authors.
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This work is licensed under a Creative Commons Attribution 4.0 International License.

Review

Advancing Hydrogen Development from 2015 to 2024 and Mitigating Noₓ Emissions from Hydrogen-Enriched Combustion for a Cleaner Energy Future

Yi-Kai Chih 1,*, Shang-Rong Kuo 2, and Jing-Jie Wang 2

1 Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan

2 Department of Greenergy, National University of Tainan, Tainan 701, Taiwan

* Correspondence: chihyikai@gmail.com or chihyk@mail.nutn.edu.tw

Received: 13 December 2024; Revised: 4 March 2025; Accepted: 13 March 2025; Published: 17 March 2025

Abstract: This study explores hydrogen energy’s transformative role in achieving net-zero greenhouse gas emissions, focusing on mitigating nitrogen oxides (NOx), a byproduct of hydrogen-enriched fuel combustion. Driven by rapid growth in hydrogen research from 2015 to 2024, it highlights hydrogen’s potential to address critical energy and environmental challenges. Hydrogen production is classified into thermolysis, biophotolysis, electrolysis, and photoelectrochemical processes, with distinct energy sources and outputs. Color codes denote hydrogen types: green (electrolysis using renewables), blue (carbon capture in natural gas reforming), gray (no carbon capture), pink (nuclear-powered), and turquoise (methane decomposition). By 2050, green hydrogen, aligned with decarbonization goals and declining costs, is expected to dominate the market, while blue hydrogen will act as a transitional source. The paper emphasizes the importance of hydrogen pricing, regional production cost disparities, and strategic investments to enhance low-emission hydrogen competitiveness. However, a major challenge is increased NOx emissions from higher combustion temperatures. This study reviews key mitigation strategies, including hydrogen-natural gas blending, staged combustion, exhaust gas recirculation (EGR), and post-combustion measures such as Selective Catalytic Reduction (SCR). Among these, EGR effectively lowers peak combustion temperatures, while staged combustion optimizes fuel-air mixing to minimize NOx formation. Additionally, SCR remains one of the most efficient post-combustion solutions, reducing NOx emissions by over 80% in various applications. This study demonstrates how these strategies can maximize hydrogen’s energy potential while minimizing environmental impacts.

Keywords:

hydrogen combustion challenges sustainability net zero nitrogen oxides (NOx)

References

  1. Lee, K.-T.; Cai, Y.-S.; Hou, Q.-Y.; et al. A Brief Overview of Green Hydrogen on Production, Regulations, and Commercialization. Green Energy Fuel Res. 2024, 1, 3–12. doi: 10.53941/gefr.2024.100002
  2. Obiora, N.K.; Ujah, C.O.; Asadu, C.O.; et al. Production of hydrogen energy from biomass: Prospects and challenges. Green Technol. Sustain. 2024, 2, 100100. doi: 10.1016/j.grets.2024.100100
  3. Singh, S.K.; Tiwari, A.K. Solar-powered hydrogen production: Advancements, challenges, and the path to net-zero emissions. Int. J. Hydrogen Energy 2024, 84, 549–579. doi: 10.1016/j.ijhydene.2024.08.209
  4. Dharani, S.; Vadivel, S.; Gnanasekaran, L.; et al. S-scheme heterojunction photocatalysts for hydrogen production: Current progress and future prospects. Fuel 2023, 349, 128688. doi: 10.1016/j.fuel.2023.128688
  5. Anekwe, I.M.S.; Akpasi, S.O.; Enemuo, E.M.; et al. Innovations in catalytic understanding: A journey through advanced characterization. Mater. Today Catal. 2024, 7, 100061. doi: 10.1016/j.mtcata.2024.100061
  6. Zhang, J.; Ma, C.; Jia, S.; et al. Electrocatalysts Design Guided by Active Intermediates of Hydrogen Evolution Reaction. Adv. Energy Mater. 2023, 13, 2302436. doi: 10.1002/aenm.202302436
  7. Naqvi, S.R.; Kazmi, B.; Ammar Taqvi, S.A.; et al. Techno economic analysis for advanced methods of green hydrogen production. Curr. Opin. Green Sustain. Chem. 2024, 48, 100939. doi: 10.1016/j.cogsc.2024.100939
  8. Office of Fossil Energy. Hydrogen Strategy, Enabling a Low Carbon Economy; Office of Fossil Energy: Washington, DC, USA, 2020.
  9. Karaca, A.E.; Qureshy, A.M.M.I.; Dincer, I. An overview and critical assessment of thermochemical hydrogen production methods. J. Clean. Prod. 2023, 385, 135706. doi: 10.1016/j.jclepro.2022.135706
  10. Chen, W.-H.; Biswas, P.P.; Ong, H.C.; et al. A critical and systematic review of sustainable hydrogen production from ethanol/bioethanol: Steam reforming, partial oxidation, and autothermal reforming. Fuel 2023, 333, 126526. doi: 10.1016/j.fuel.2022.126526
  11. Ivanenko, A.A.; Laikova, A.A.; Zhuravleva, E.A.; et al. Biological production of hydrogen: From basic principles to the latest advances in process improvement. Int. J. Hydrogen Energy 2024, 55, 740–755. doi: 10.1016/j.ijhydene.2023.11.179
  12. Imran, S.; Hussain, M. Emerging trends in water splitting innovations for solar hydrogen production: Analysis, comparison, and economical insights. Int. J. Hydrogen Energy 2024, 77, 975–996. doi: 10.1016/j.ijhydene.2024.06.254
  13. Shiva Kumar, S.; Lim, H. An overview of water electrolysis technologies for green hydrogen production. Energy Rep. 2022, 8, 13793–13813. doi: 10.1016/j.egyr.2022.10.127
  14. Oni, A.O.; Anaya, K.; Giwa, T.; et al. Comparative assessment of blue hydrogen from steam methane reforming, autothermal reforming, and natural gas decomposition technologies for natural gas-producing regions. Energy Convers. Manag. 2022, 254, 115245. doi: 10.1016/j.enconman.2022.115245
  15. Dermühl, S.; Riedel, U. A comparison of the most promising low-carbon hydrogen production technologies. Fuel 2023, 340, 127478. doi: 10.1016/j.fuel.2023.127478
  16. Bento, C.; Lopes, T.F.; Rodrigues, P.; et al. Biogas reforming as a sustainable solution for hydrogen production: Comparative environmental metrics with steam-methane reforming and water electrolysis in the Portuguese context. Int. J. Hydrogen Energy 2024, 66, 661–675. doi: 10.1016/j.ijhydene.2024.04.113
  17. Li, Y.; Lin, R.; O’Shea, R.; et al. A perspective on three sustainable hydrogen production technologies with a focus on technology readiness level, cost of production and life cycle environmental impacts. Heliyon 2024, 10, e26637. doi: 10.1016/j.heliyon.2024.e26637
  18. Saravanan, P.; Khan, M.R.; Yee, C.S.; et al. 7—An overview of water electrolysis technologies for the production of hydrogen. In New Dimensions in Production and Utilization of Hydrogen; Nanda, S., Vo, D.-V.N., Nguyen-Tri, P., Eds.; Elsevier: Amsterdam, The Netherlands, 2020; pp. 161–190. doi: 10.1016/B978-0-12-819553-6.00007-6
  19. Green Hydrogen Cost Reduction; International Renewable Energy Agency: Masdar City, Abu Dhabi, 2020.
  20. Kumar, S.S.; Lim, H. Recent advances in hydrogen production through proton exchange membrane water electrolysis—A review. Sustain. Energy Fuels 2023, 7, 3560–3583. https://doi.org/10.1039/D3SE00336A.
  21. Bianchi, F.R.; Bosio, B. Operating Principles, Performance and Technology Readiness Level of Reversible Solid Oxide Cells. Sustainability 2021, 13, 4777. doi: 10.3390/su13094777
  22. Incer-Valverde, J.; Korayem, A.; Tsatsaronis, G.; et al. “Colors” of hydrogen: Definitions and carbon intensity. Energy Convers. Manag. 2023, 291, 117294. doi: 10.1016/j.enconman.2023.117294
  23. Swadi, M.; Jasim Kadhim, D.; Salem, M.; et al. Investigating and predicting the role of photovoltaic, wind, and hydrogen energies in sustainable global energy evolution. Glob. Energy Interconnect. 2024, 7, 429–445. doi: 10.1016/j.gloei.2024.08.009
  24. AlHumaidan, F.S.; Absi Halabi, M.; Rana, M.S.; et al. Blue hydrogen: Current status and future technologies. Energy Convers. Manag. 2023, 283, 116840. doi: 10.1016/j.enconman.2023.116840
  25. Xu, G.; Huang, Z.; Jiang, M.; et al. “Gray” Prediction of Carbon Neutral Pathways in the G7 Economies by 2050. Appl. Energy 2024, 373, 123924. doi: 10.1016/j.apenergy.2024.123924
  26. Pathak, P.K.; Yadav, A.K.; Padmanaban, S. Transition toward emission-free energy systems by 2050: Potential role of hydrogen. Int. J. Hydrogen Energy 2023, 48, 9921–9927. doi: 10.1016/j.ijhydene.2022.12.058
  27. Global Hydrogen Review 2024; International Energy Agency: Paris, France, 2024.
  28. Global Hydrogen Review 2022; International Energy Agency: Paris, France, 2022.
  29. Cao, D.N.; Hoang, A.T.; Luu, H.Q.; et al. Effects of injection pressure on the NOx and PM emission control of diesel engine: A review under the aspect of PCCI combustion condition. Energy Sources Part A: Recovery Util. Environ. Eff. 2024, 46, 7414–7431. doi: 10.1080/15567036.2020.1754531
  30. Józsa, V. Mixture temperature-controlled combustion: A revolutionary concept for ultra-low NOx emission. Fuel 2021, 291, 120200. doi: 10.1016/j.fuel.2021.120200
  31. Stępień, Z. A comprehensive overview of hydrogen-fueled internal combustion engines: Achievements and future challenges. Energies 2021, 14, 6504. doi: 10.3390/en14206504
  32. Pitsch, H. The transition to sustainable combustion: Hydrogen-and carbon-based future fuels and methods for dealing with their challenges. Proc. Combust. Inst. 2024, 40, 105638. doi: 10.1016/j.proci.2024.105638
  33. Le, T.T.; Sharma, P.; Bora, B.J.; et al. Fueling the future: A comprehensive review of hydrogen energy systems and their challenges. Int. J. Hydrogen Energy 2024, 54, 791–816. doi: 10.1016/j.ijhydene.2023.08.044
  34. Strollo, J.; Peluso, S.; O’Connor, J. Effect of hydrogen on steady-state and transient combustion instability characteristics. J. Eng. Gas Turbines Power 2021, 143, 071023. doi: 10.1115/1.4049481
  35. Taamallah, S.; Vogiatzaki, K.; Alzahrani, F.M.; et al. Fuel flexibility, stability and emissions in premixed hydrogen-rich gas turbine combustion: Technology, fundamentals, and numerical simulations. Appl. Energy 2015, 154, 1020–1047. doi: 10.1016/j.apenergy.2015.04.044
  36. Wright, M.L.; Lewis, A.C. Emissions of NOx from blending of hydrogen and natural gas in space heating boilers. Elem. : Sci. Anthr. 2022, 10, 00114. https://doi.org/10.1525/elementa.2021.00114.
  37. Glanville, P.; Fridlyand, A.; Sutherland, B.; et al. Impact of hydrogen/natural gas blends on partially premixed combustion equipment: NOx emission and operational performance. Energies 2022, 15, 1706. doi: 10.3390/en15051706
  38. Mao, G.; Shi, T.; Mao, C.; et al. Prediction of NOx emission from two-stage combustion of NH3–H2 mixtures under various conditions using artificial neural networks. Int. J. Hydrogen Energy 2024, 49, 1414–1424. doi: 10.1016/j.ijhydene.2023.10.129
  39. Xu, S.; Chen, Y.; Tian, Z.; et al. NO emission reduction characteristics of CH4/H2 staged MILD combustion over a wide range of hydrogen-blending ratios. Fuel 2024, 372, 132239. doi: 10.1016/j.fuel.2024.132239
  40. Sekar, M.; Selim, M.Y.E.; Saleh, H.E.; et al. Utilization of hydrogen and methane as energy carriers with exhaust gas recirculation for sustainable diesel engines. Energy Convers. Manag. X 2024, 23, 100618. doi: 10.1016/j.ecmx.2024.100618
  41. Masoumi, S.; Houshfar, E.; Ashjaee, M. Experimental and numerical analysis of ammonia/hydrogen combustion under artificial exhaust gas recirculation. Fuel 2024, 357, 130081. doi: 10.1016/j.fuel.2023.130081
  42. Kim, H.J.; Jo, S.; Kwon, S.; et al. NOx emission analysis according to after-treatment devices (SCR, LNT + SCR, SDPF), and control strategies in Euro-6 light-duty diesel vehicles. Fuel 2022, 310, 122297. doi: 10.1016/j.fuel.2021.122297
  43. Li, C.; Xiong, Z.; Du, Y.; et al. Promotional effect of tungsten modification on magnetic iron oxide catalyst for selective catalytic reduction of NO with NH3. J. Energy Inst. 2020, 93, 1809–1818. doi: 10.1016/j.joei.2020.03.012