Ammonia-borane and methylamine-borane as reactive hydrogen carriers in diesel combustion: Exergy destruction, combustion characteristics, and second-law efficiency
Energy, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.energy.2026.141919
- Dergi Adı: Energy
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Applied Science & Technology Source, Compendex, Environment Index, Geobase, INSPEC, Public Affairs Index, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: Ammonia-borane, Boron-based additives, Diesel engine, Exergy destruction, Low-carbon combustion, Methylamine-borane, Sustainability index
- Van Yüzüncü Yıl Üniversitesi Adresli: Evet
Özet
This study evaluates the potential of boron-based solid-state hydrogen carriers, specifically ammonia-borane (AB) and methylamine-borane (MeAB), as active molecular additives in compression-ignition (CI) engines. Blends containing 5 vol% of DAB5 and 5 vol% of DMeAB5 were tested across a range of engine load conditions to characterize combustion kinetics, emission profiles, and exergy destruction without hardware modifications. Experimental results indicate that both borane blends markedly modify the heat release rate, with DMeAB5 yielding the largest emission reductions at full load: CO (20.42%), HC (35.2%), NOx (14.58%), and CO2 (22.80%). These reductions are attributed to optimized combustion phasing and the dilution effect associated with the lower carbon loading of the blended fuels. A central contribution of this work is the rigorous exergy-based analysis, which demonstrates that DAB5 exhibits the most favorable overall thermodynamic performance: the brake thermal efficiency rises from 31.52% for neat diesel to 37.82% for DAB5 at full load, corresponding to a relative gain of 20.01%, while an average improvement of 13.26% is recorded across the complete load range, and the peak exergy efficiency increases from 24.83% to 25.94% at 75% engine load (a relative gain of 4.47%). Correspondingly, the Sustainability Index reaches its maximum value of 1.35 for DAB5 at 75% load, confirming the link between enhanced second-law performance and reduced environmental impact. Response surface methodology (RSM) validated these findings with high correlation (R2 > 97%). The results demonstrate that amine-borane derivatives effectively bridge the gap between solid-state hydrogen storage and high-efficiency, low-carbon power generation. FT-IR spectroscopy and XRD analysis confirmed the structural integrity and purity of both synthesized additives. The complementary performance profiles of DAB5 (thermodynamic efficiency) and DMeAB5 (emission abatement) establish a structure–activity framework for selecting amine-borane derivatives as hardware-agnostic, drop-in hydrogen carriers for CI engine applications.