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Applied Sciences
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Advances in Sustainable Hydrogen Production: Challenges and Opportunities
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Advances in Sustainable Hydrogen Production: Challenges and Opportunities

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Environmental Sciences".

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 3173

Special Issue Editor

Prof. Dr. Francisco Heras

E-Mail Website
Guest Editor
Department of Chemical Engineering, Faculty of Sciences, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
Interests: biomass; biowastes; aqueous-phase reforming; hydrodechlorination water treatment; mesoporous carbon; doped carbon; environmental chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Currently, most developed countries are involved in a green transition in energy production. For that purpose, green hydrogen is considered the most interesting and promising vector. Since the main hydrogen production process has been, traditionally, steam reforming of natural gas or crude oil fractions, a deep transition to sustainable processes is needed. The Applied Sciences Special Issue “Advances in Sustainable Hydrogen Production: Challenges and Opportunities” will provide a unique opportunity to share the latest research and advances in sustainable hydrogen production developments, with a special focus on those based on the use of wastes as hydrogen sources.

Prof. Dr. Francisco Heras
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • bio-hydrogen
  • green hydrogen
  • sustainable energy production
  • green energy transition
  • biomass
  • fermentation
  • gasification
  • reforming
  • pyrolysis
  • hydrothermal carbonization

Published Papers (2 papers)

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Research

14 pages, 4695 KiB  
Article
Data-Driven Approach to Modeling Biohydrogen Production from Biodiesel Production Waste: Effect of Activation Functions on Model Configurations
by SK Safdar Hossain, Bamidele Victor Ayodele, Zaid Abdulhamid Alhulaybi and Muhammad Mudassir Ahmad Alwi
Appl. Sci. 2022, 12(24), 12914; https://doi.org/10.3390/app122412914 - 15 Dec 2022
Viewed by 1232
Abstract
Biodiesel production often results in the production of a significant amount of waste glycerol. Through various technological processes, waste glycerol can be sustainably utilized for the production of value-added products such as hydrogen. One such process used for waste glycerol conversion is the [...] Read more.
Biodiesel production often results in the production of a significant amount of waste glycerol. Through various technological processes, waste glycerol can be sustainably utilized for the production of value-added products such as hydrogen. One such process used for waste glycerol conversion is the bioprocess, whereby thermophilic microorganisms are utilized. However, due to the complex mechanism of the bioprocess, it is uncertain how various input parameters are interrelated with biohydrogen production. In this study, a data-driven machine-learning approach is employed to model the prediction of biohydrogen from waste glycerol. Twelve configurations consisting of the multilayer perceptron neural network (MLPNN) and the radial basis function neural network (RBFNN) were investigated. The effect of using different combinations of activation functions such as hyperbolic tangent, identity, and sigmoid on the model’s performance was investigated. Moreover, the effect of two optimization algorithms, scaled conjugate gradient and gradient descent, on the model performance was also investigated. The performance analysis of the models revealed that the manner in which the activation functions are combined in the hidden and outer layers significantly influences the performance of various models. Similarly, the model performance was also influenced by the nature of the optimization algorithms. The MLPNN models displayed better predictive performance compared to the RBFNN models. The RBFNN model with softmax as the hidden layer activation function and identity as the outer layer activation function has the least predictive performance, as indicated by an R2 of 0.403 and a RMSE of 301.55. While the MLPNN configuration with the hyperbolic tangent as the hidden layer activation function and the sigmoid as the outer layer activation function yielded the best performance as indicated by an R2 of 0.978 and a RMSE of 9.91. The gradient descent optimization algorithm was observed to help improve the model’s performance. All the input variables significantly influence the predicted biohydrogen. However, waste glycerol has the most significant effects. Full article
(This article belongs to the Special Issue Advances in Sustainable Hydrogen Production: Challenges and Opportunities)
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12 pages, 2606 KiB  
Article
Toward Sustainability of the Aqueous Phase Reforming of Wastewater: Heat Recovery and Integration
by Francisco Heras, Adriana S. de Oliveira, José A. Baeza, Luisa Calvo, Víctor R. Ferro and Miguel A. Gilarranz
Appl. Sci. 2022, 12(20), 10424; https://doi.org/10.3390/app122010424 - 16 Oct 2022
Cited by 4 | Viewed by 1603
Abstract
Aqueous-phase reforming has been revealed as a novel, interesting and efficient process for the treatment of wastewater containing organic pollutants. However, due to the relatively severe operating conditions (above 15 bar and 200 °C), this process could become economically competitive if any solution [...] Read more.
Aqueous-phase reforming has been revealed as a novel, interesting and efficient process for the treatment of wastewater containing organic pollutants. However, due to the relatively severe operating conditions (above 15 bar and 200 °C), this process could become economically competitive if any solution for energy or material valorization is implemented. Most research has been devoted to direct the process to H2 production as an alternative to reach economic sustainability, but the results obtained were not competitive in the current market of hydrogen and syngas. In this work, a preliminary simulation study (using Aspen HYSYS software) of the process heat balance in different conditions was implemented to induce a heat integration that would allow the auto-sustainability of the process, even generating in some cases an excess of energy that could constitute an opportunity for a positive economic balance. The results showed that this approach would only be possible by maximizing the methane production to the detriment of hydrogen production. Full article
(This article belongs to the Special Issue Advances in Sustainable Hydrogen Production: Challenges and Opportunities)
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