International Journal of Hydrogen Energy最新文献

{"title":"Experimental study on absorption and desorption behavior of a novel metal hydride reactor for stationary hydrogen storage applications","authors":"Shubham Parashar ,&nbsp;P. Muthukumar ,&nbsp;Atul Kumar Soti","doi":"10.1016/j.ijhydene.2024.11.058","DOIUrl":"10.1016/j.ijhydene.2024.11.058","url":null,"abstract":"<div><div>Metal hydrides have captured significant attention for hydrogen storage because of their high energy density and safety. However, the performance of these systems is largely influenced by the design of the storage reactor. In this perspective, a novel compact, lightweight, and effective multi tube MH reactor was designed, fabricated, and experimentally tested. The absorption and desorption behavior of the newly developed Ti_0.9Zr_0.1Mn_1.46V_0.45Fe_0.09 alloy using the proposed MH reactor for hydrogen storage applications was analysed. At 30 bar supply pressure, the MH reactor absorbed 164.3 g (1.58 wt.%) of hydrogen in 894 s and delivered specific energy at an average rate of 94.7 W/kg_MH. Further, the reactor released 153.6 g (1.48 wt.%) of hydrogen in 2246 s, when the desorption temperature was set at 50 ^°C. Moreover, the parametric study revealed that by raising the supply pressure from 10 bar to 20 bar and 30 bar, the stored capacity was improved by 11 % and 18.9 %, respectively, whereas the absorption time was drastically reduced by 43 % and 61.5 %, respectively. Furthermore, the fabricated reactor achieved gravimetric and volumetric storage densities of 0.75 % and 20.6 kg/m³ of H₂. Also, the MH reactor achieved a maximum hydrogen storage efficiency of 82.3 %. Finally, the comparative results indicated that the MH reactor studied in this work demonstrated a faster hydrogen release rate compared to other medium to large capacity MH reactors reported in the literature.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 1224-1235"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Standalone green hydrogen production powered by photovoltaic panels and solar atmospheric water harvesting hybrid system: Experimental investigation","authors":"Rania S. Nada ,&nbsp;Mohamed Emam ,&nbsp;Hamdy Hassan","doi":"10.1016/j.ijhydene.2024.11.221","DOIUrl":"10.1016/j.ijhydene.2024.11.221","url":null,"abstract":"<div><div>The current study experimentally investigates the performance of a hybrid standalone solar system of atmospheric water harvesting (AWH) and solar photovoltaic powering electrolyzer for green water and green hydrogen production. The system prototype is designed, constructed, and tested under outdoor summer and winter climate conditions of Alexandria, Egypt at different operating and design enhancement conditions. Water electrolyzes concept for green hydrogen production system driven by a photovoltaic panel and silica gel absorption/desorption atmospheric water harvesting solar still concept with insertion of porous sheet metals for freshwater production is performed and evaluated. The results show a rise of the AWH freshwater production of (60% and 120%) and (146% and 260%) in summer and winter, respectively with the insertion of one and two porous metal sheets, respectively. The maximum rise of the AWH efficiency is 82% in summer and 53.4% in winter by using 2 porous metal sheets. The hydrogen production rate of the system in summer is higher than that of winter by about 25%. System efficiency is almost doubled when electrolyzer KOH concentration increased from 4 gm/kg to 12 gm/kg water. The average daily system efficiency of the AWH, electrolyzer, and overall system reaches 11.6%, 65.1%, and 2.6% when operating at a KOH concentration of 12 gm/kg with two porous metal sheets. The study contributes to achieving mainly SDG goals 6, 7, and 13.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 984-996"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Additive effect of alkaline earth metal on hydrogen production via catalytic ammonia decomposition over Co/CeO2 catalysts","authors":"Wenshuo Zhang ,&nbsp;Weili Zhou ,&nbsp;Yangfeng Li ,&nbsp;Yajun Chen ,&nbsp;Zhihai Zhang ,&nbsp;Yao Zhao ,&nbsp;Xing Li ,&nbsp;Yi Mou ,&nbsp;Zhandong Wang","doi":"10.1016/j.ijhydene.2024.11.170","DOIUrl":"10.1016/j.ijhydene.2024.11.170","url":null,"abstract":"<div><div>The production of hydrogen from directly catalytic ammonia decomposition shows promise in improving the ammonia viability for engine use. For practical application, it is demanded to investigate additives as well as their impact mechanism on the catalytic properties of transition metal catalysts. Herein, a series of Co/CeO₂ catalysts were prepared via a facile precipitation method and the effect of Mg adding was investigated. It is found that addition of 1% Mg decreased the catalytic activity of 5% and 10% Co/CeO₂, while increased that of 20% Co/CeO₂. Systematic characterizations revealed that Mg promoted the metal-support interaction, which not only benefited the dispersion of Co, but also increased the valence state of Co and enhanced the reducibility. Also, more oxygen vacancies were generated, thus benefiting the reaction process. This work invested new insights into the role of alkaline-earth metal in NH₃ decomposition and provided a strategy to modulate the hydrogen–ammonia ratio which is vital for NH₃ combustion.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 697-705"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogen–steam separation using mechanical vapor recompression cycle","authors":"Alon Lidor","doi":"10.1016/j.ijhydene.2024.11.040","DOIUrl":"10.1016/j.ijhydene.2024.11.040","url":null,"abstract":"<div><div>Solar thermochemical hydrogen production is a promising pathway for producing sustainable fuels and chemicals. One of the main challenges in the development of these processes is their low steam conversion extent, dictated by its restrictive thermodynamics requiring extremely high temperatures over 1500<!--> <!-->°C and low oxygen partial pressure to obtain a steam conversion over 10%. While condensing the unreacted steam is technically simple, the latent heat is thus rendered useless for the process. In many cases, this lost heat can be larger than the higher heating value of the produced hydrogen. We propose a new separation method based on a mechanical vapor recompression cycle, enabling the recovery of the latent heat by compressing the steam–hydrogen mixture prior to the condensation process, thus creating a temperature difference between the hot exhaust and cold inlet streams. We show that this separation method can recover the latent heat and keep its quality in relevant operating conditions while requiring less than 14% of the recovered heat for compression work, resulting in a coefficient of performance over 7. This method increases the viability of solar thermochemical hydrogen production cycles, especially under limited steam conversion conditions.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 664-668"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Addressing the challenge of ammonia slip and nitrous oxide emissions from zero-carbon fuelled engines through catalytic aftertreatment solutions","authors":"M. Wu ,&nbsp;A. Cova-Bonillo ,&nbsp;P. Gabana ,&nbsp;G. Brinklow ,&nbsp;N.D. Khedkar ,&nbsp;J.M. Herreros ,&nbsp;S. Zeraati Rezaei ,&nbsp;A. Tsolakis ,&nbsp;P. Millington ,&nbsp;S. Alcove Clave ,&nbsp;Andrew P.E. York","doi":"10.1016/j.ijhydene.2024.11.173","DOIUrl":"10.1016/j.ijhydene.2024.11.173","url":null,"abstract":"<div><div>Addressing climate change demands, energy security and resilience has necessitated replacing conventional fossil-based fuels with zero and carbon-neutral fuels/energy carriers. The most immediate solution is the partial and progressive substitution of conventional fuels in transportation. The effects of partially substituting gasoline with ammonia/hydrogen (NH₃/H₂) mixtures in a spark ignition (SI) engine are investigated in this paper. The utilization of NH₃/H₂ mixtures is a promising avenue of research since they can be produced from on-board NH₃ reforming, utilising heat energy that is recovered from hot exhaust gases. Experimental results indicate that adding NH₃/H₂ enabled stable engine operation at lean conditions (λ = 1.4), resulting in reduced carbon-based emissions due to the non-carbon nature of NH₃/H₂. Utilising an integrated approach that combined a hemispherical flame geometry model with a thermodynamic model, has revealed that the introduction of NH₃/H₂ significantly enhanced the combustion speed during the initial phase and further improved combustion efficiency. However, nitrogen-based emissions such as NO and NO₂ increased. This work also assessed the performance of a conventional three-way catalyst (TWC) and a double-function ammonia slip catalyst (ASC) in mitigating emissions. The TWC effectively controlled carbon-based emissions and NO under stoichiometric conditions but exhibited reduced efficiency under lean conditions, especially with NH₃ present. The ASC demonstrated high NH₃ conversion efficiency even at low temperatures, making it suitable for engine start-up and warm-up phases. Under steady-state conditions with artificially increased NH₃/NO_X ratios, a significant reduction in NOx emission was achieved with the ASC. However, high NH₃/NO_X ratios increased nitrous oxide (N₂O) formation and NH₃ slip.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 848-861"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A precise prediction for the hydrogen storage ability of perovskite XPH3 (X=Li, Na, K) hydrides: First-principles study","authors":"Hudabia Murtaza ,&nbsp;Quratul Ain ,&nbsp;Shams A.M. Issa ,&nbsp;Hesham M.H. Zakaly ,&nbsp;Junaid Munir","doi":"10.1016/j.ijhydene.2024.11.135","DOIUrl":"10.1016/j.ijhydene.2024.11.135","url":null,"abstract":"<div><div>Hydrogen storage remains a significant barrier to creating a sustainable hydrogen economy, as many current materials fail to meet the high safety, efficiency, and capacity requirements. Current hydrogen storage technologies frequently exhibit low gravimetric densities and slow absorption/desorption rates, which limit their practical applicability in energy systems. This manuscript reports the first principles analysis on the physical features of alkali-based perovskite hydrides LiPH₃, NaPH₃, and KPH₃, along with their hydrogen storage potential. Volume optimization curves, negative formation enthalpies and tolerance factor manifested the complete structural and geometric stability of these studied hydrides. Brittle, higher resistance to indentation, endurance towards high temperatures and anisotropic behavior are revealed through mechanical attributes for LiPH₃, NaPH₃, and KPH₃. Higher longitudinal velocities are observed in crystallographic planes. The directional velocities for XPH3 (X = Li, Na, K) reflect an anisotropic nature in each crystallographic plane. The electronic band structure, TDOS and PDOS elaborates the metallic behavior of these studied hydrides. These hydrides' optical characteristics showed that they have good optical conductivity in the UV spectrum, along with minimal polarization and dispersion in the UV region. The hydrogen storage capacities for LiPH₃ (6.83 wt%), NaPH₃ (5.00 wt%), and KPH₃ (3.95 wt%) signifies that all perovskite hydrides have shown promising results for hydrogen storage but LiPH₃ is the strongest contender for hydrogen storage with highest gravimetric ratio (6.83 wt%) and volumetric storage (93.39 gH₂/L) as it fulfills the energy storage demand mentioned by US-DOE of metal hydrides for year 2025.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 1084-1093"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of carbon capture and utilization in steelmaking: A case study using a hybrid fuel cell - gas turbine system","authors":"Elisângela Martins Leal ,&nbsp;Natália Ribeiro","doi":"10.1016/j.ijhydene.2024.11.128","DOIUrl":"10.1016/j.ijhydene.2024.11.128","url":null,"abstract":"<div><div>This paper investigates a carbon capture and utilization plant that converts steelmaking exhaust gases into valuable fuels. It examines the behavior of synthesis gas, identifies optimal operational parameters, and explores kinetics for methanol and ethanol production. Additionally, it examines the impact of varying H₂/CO, and H₂/CO₂ ratios and evaluates the efficiency of a hybrid system combining a solid oxide fuel cell (SOFC) and gas turbine (GT) powered by synthesized methanol. Using the Chemical Equilibrium with Applications software, the study analyzes the dynamic behavior of synthesis gas molar fractions within the water-gas shift reactor and Fischer Tropsch reactor. Optimal operational parameters were identified at a temperature range of 200–250 °C, pressure of 4.5 MPa, H₂/CO, and H₂/CO₂ ratios of 2.0, enabling efficient carbon conversion. Further exploration into the kinetics, alongside the commercial Cu/ZnO/Al₂O₃ catalyst in the Fischer Tropsch synthesis, supports methanol and ethanol production. Increased H₂/CO, and H₂/CO₂ ratios favor methanol production with lower carbon dioxide fractions, while ethanol production and CO₂ emissions decrease as these ratios rise. Finally, a case study incorporates exergoeconomic and exergoenvironmental analyses of a SOFC-GT hybrid system fuelled by methanol from Fischer Tropsch synthesis, where the combustor exhibits the lowest exergy efficiency (62.3%), while the fuel cell achieves an exergy efficiency of about 86.5%.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 883-896"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial MILP optimization framework for siting Hydrogen Refueling Stations in heavy-duty freight transport","authors":"Antonio De Padova ,&nbsp;Daniele Salvatore Schiera ,&nbsp;Francesco Demetrio Minuto ,&nbsp;Andrea Lanzini","doi":"10.1016/j.ijhydene.2024.11.086","DOIUrl":"10.1016/j.ijhydene.2024.11.086","url":null,"abstract":"<div><div>The need for deep decarbonization of the transport sector cannot be understated, as it accounts for about the 25% of greenhouse gas emissions in Europe. Developing hydrogen-based trucks is one of the viable solutions for exploiting green hydrogen and reaching climate neutrality. This work presents an optimization framework to optimally place Hydrogen Refueling Stations (HRS) for hydrogen-based trucks under technical, policy and regulatory constraints. It relies on an EU heavy-duty road freight transport database adapted to the latest publicly available statistics to update the demand intensity. A revised Node Capacitated Flow Refueling Location Model is proposed to minimize the number of HRS to be sited on the highway network. The node capacity constraint considers standard sized HRS with a maximum daily capacity ranging from 500 (S-sized) to 4000 kg (XL-sized). The framework can be a useful evaluation tool to strategically site HRS, both for policymakers and stakeholders. To this end, the Italian highway network was evaluated as a case study, finding that at least 78 HRS nodes are required across the road network if a 10% share of hydrogen vehicles is considered, as planned in the Italian National Recovery and Resilience Plan. The median utilization factor of the refueling stations is 67.5%, ranging from 49% for the S-sized to 86% for the XL-sized, which are located mainly in northern Italian regions. To effectively reduce emissions in road freight transport, results show that at least 368 MW of additional equivalent photovoltaic capacity is needed to produce entirely green hydrogen, reducing the greenhouse gases emissions associated to the road freight transport by 6.5%.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 669-686"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of hydrogen storage capacity required for decarbonization: A case study using off-site green hydrogen for buildings","authors":"Yuta Segawa ,&nbsp;Naruki Endo ,&nbsp;Eisuke Shimoda ,&nbsp;Toshihiro Yamane","doi":"10.1016/j.ijhydene.2024.11.159","DOIUrl":"10.1016/j.ijhydene.2024.11.159","url":null,"abstract":"<div><div>We have been developing hydrogen utilization systems for buildings using fuel cell, electrolyzer, and metal hydride hydrogen storage. This paper describes the reduction of CO₂ emissions from buildings and assesses the hydrogen storage capacity required for using off-site hydrogen. We prepared a low- and a high-load-factor model to investigate the effects of off-site hydrogen deployment for different building uses. We confirmed that off-site hydrogen delivery contributes to reducing hydrogen storage capacity in the two models. We identified how hydrogen delivery planning can substantially reduce hydrogen storage capacity while achieving high CO₂ emission reductions. The study also confirmed that hydrogen transportation is effective, even when parameters such as photovoltaic (PV) generation capacity are considered. The entire off-site hydrogen utilization system costs, including the cost of operating off-site hydrogen in a building, were evaluated to identify lower-cost operation conditions. The findings show that the cost of operating an off-site hydrogen system in a building can be managed through a well-designed hydrogen delivery strategy that does not increase the capacity required for hydrogen storage facilities.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 1046-1055"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of the jet obstacle on flame acceleration and deflagration-to-detonation transition: A numerical perspective","authors":"Liangyi Fan ,&nbsp;Jiabao Wang ,&nbsp;Xinyu Zhao ,&nbsp;Jianfeng Pan ,&nbsp;Yuejin Zhu","doi":"10.1016/j.ijhydene.2024.11.175","DOIUrl":"10.1016/j.ijhydene.2024.11.175","url":null,"abstract":"<div><div>As a new type of the detonation-promoting technology, the jet obstacle has attracted wide attention of researchers, but there are still many deficiencies in the current studies. Based on means of numerical analysis, the effects of jet velocity and the non-uniformity of the velocity distribution on flame acceleration and DDT (deflagration-to-detonation transition) processes are investigated in detail using the unsteady Reynolds average simulation method. The findings indicate that, with regard to flame acceleration, an increase in jet velocity will initially impede the acceleration of the flame to a certain extent. Nevertheless, the interaction between the flame and the jet gives rise to a complex multiple acceleration mechanism (such as the intensification of flow field perturbations within the channel, an augmented accumulation of premixed gases, an amplified virtual blocking effect, and an enlarged recirculation zone). This increased jet velocity serves to accelerate both the propagation of the flame and the detonation initiation process. The jet non-uniformity of the velocity distribution is also a vital factor to improve the DDT process. With the increase in the trend of non-uniformity changes in the jet velocity distribution (the continuous enhanced jets are used in this paper), the time and distance required for the detonation initiation of premixed gases are shortened. Furthermore, depending on the state of the shock wave, the detonation initiation processes in this paper all belong to the shock to detonation transition, which can be further classified into two categories: (I) detonation that induced by shock reflection; and (II) detonation that induced by shock focusing.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"94 ","pages":"Pages 1236-1246"},"PeriodicalIF":8.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}