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Advances in Waste Biomass and Environmental Sustainability: 2nd Edition

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Guest Editor
Department of Chemical and Biological Engineering, Universidade do Porto, Porto, Portugal
Interests: heterogeneous catalysis; carbon materials; catalytic hydrogenation; biomass and wastes valorisation; sustainable processes; fine chemicals and fuels synthesis; catalysis for biomass conversion
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Special Issue Information

Dear Colleagues,

The depletion of fossil fuel resources is a major threat to the sustainable development of human society; therefore, biomass has gained increasing attention in relation to the production of chemicals, fuels, and materials for environmental applications. Thermochemical conversion technologies, such as pyrolysis and hydrothermal operations, could provide an alternative for the processing of biomass and wastes, enabling reuse via the transformation of their properties. In addition, the catalytic processing of biomass residues is a promising approach for the production of high-value chemicals, which still requires intense efforts. 

We are pleased to invite you to contribute to this Special Issue, entitled “Advances in Waste Biomass and Environmental Sustainability: 2nd Edition”, to be published in Sustainability. Considering the importance of sustainability and sustainable development, Sustainability strives to support the 2030 Agenda for Sustainable Development adopted by the United Nations.

This Special Issue aims to present and disseminate the most recent advances in waste biomass valorization processes for the production of high-value chemicals, with the aim of developing technologies for carbon neutrality. All studies (experimental, computational, and theoretical) within the scope of this Special Issue, including original research, review articles, and communications, are welcome for submission.

Research areas for publication may include (but are not limited to) the following: 

  • Thermochemical conversion techniques;
  • Catalytic biomass conversion;
  • Bio-oil upgrading and biochar applications;
  • Waste valorization;
  • Green processes;
  • Sustainability assessment and life-cycle analysis (LCA).

I look forward to receiving your contributions.

Yours faithfully, 

Dr. Lucília Sousa Ribeiro
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 250 words) can be sent to the Editorial Office for assessment.

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. Sustainability 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

  • biomass
  • wastes
  • hydrothermal treatment
  • pyrolysis
  • catalysis
  • sustainability

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Related Special Issue

Published Papers (2 papers)

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Research

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29 pages, 2121 KB  
Article
Sustainable Hydrogen from Palm Oil Rachis: A Techno-Environmental-Economic Assessment for Palm Rachis Gasification in Colombian Post-Conflict Rural Territories
by Paola Andrea Acevedo Pabón, Tamy Carolina Herrera-Rodríguez and Ángel Darío González-Delgado
Sustainability 2026, 18(3), 1661; https://doi.org/10.3390/su18031661 - 6 Feb 2026
Cited by 1 | Viewed by 519
Abstract
The global push for energy decarbonization has increased interest in hydrogen as a clean energy carrier. Biohydrogen from agricultural residues is a promising pathway for countries with strong agro-industrial sectors. This study evaluates the technical, economic, and environmental feasibility of hydrogen production from [...] Read more.
The global push for energy decarbonization has increased interest in hydrogen as a clean energy carrier. Biohydrogen from agricultural residues is a promising pathway for countries with strong agro-industrial sectors. This study evaluates the technical, economic, and environmental feasibility of hydrogen production from palm oil rachis in two post-conflict regions of Colombia: a large-scale facility in Bolívar and a small-scale plant in Santander. The assessment integrates Aspen Plus® (version 14) simulations using the NRTL thermodynamic model, an attributional gate-to-gate Life Cycle Assessment (LCA) with ReCiPe Midpoint (H), and a techno-economic analysis. The simulated process includes biomass drying, decomposition, steam gasification, syngas cleaning, and methane reforming. A key technical finding was the non-linear relationship between feedstock composition and process yield. Although Santander’s biomass had a higher hydrogen content (9.42% vs. 6.58%), Bolívar achieved a much higher conversion efficiency (0.198 kg H2/kg biomass) and produced over seven times more hydrogen while processing only 5.8 times more biomass. Environmental results showed clear advantages for Bolívar, which presented lower impacts across most categories compared to Santander and the fossil-based hydrogen benchmark. Bolívar achieved a Global Warming Potential of 2.47 kg CO2 eq/kg H2, far below the 15.03 kg CO2 eq/kg H2 of Santander, and showed favorable performance in particulate matter formation, acidification, and fossil resource scarcity. Economically, Bolívar was viable, with a Net Present Value of USD 25.01 million, a Benefit–Cost Ratio of 3.29, and a discounted payback period of 4.54 years. Santander was economically unfeasible under all conditions. Hydrogen production from palm rachis is technically feasible, environmentally beneficial, and economically viable when biomass availability and process integration are adequate, as illustrated by the Bolívar case. Full article
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Review

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36 pages, 3963 KB  
Review
Sustainable Aviation Fuel (SAF): A Mini-Review of Advances in Catalytic Pathways Using Lipid-Based Feedstocks and Plastic Waste
by Karoline K. Ferreira, Lucília S. Ribeiro and Manuel Fernando R. Pereira
Sustainability 2026, 18(10), 4727; https://doi.org/10.3390/su18104727 - 9 May 2026
Viewed by 533
Abstract
The fast growth of the aviation sector has intensified the need for sustainable alternatives to conventional fossil-based jet fuels. Sustainable aviation fuel (SAF) has emerged as one of the most promising strategies to reduce greenhouse gas emissions while remaining compatible with existing aviation [...] Read more.
The fast growth of the aviation sector has intensified the need for sustainable alternatives to conventional fossil-based jet fuels. Sustainable aviation fuel (SAF) has emerged as one of the most promising strategies to reduce greenhouse gas emissions while remaining compatible with existing aviation infrastructure. Among the different feedstocks explored for SAF production, lipid-based resources such as vegetable oils, animal fats, and waste cooking oil have received considerable attention due to their high content of triglycerides and free fatty acids. Additionally, the increasing generation of plastic waste has stimulated interest in its catalytic valorization as an alternative carbon source for hydrocarbon fuel production. This mini-review summarizes recent advances in catalytic pathways for producing jet-fuel-range hydrocarbons (C8–C16) from lipid-based feedstocks and polyolefins. Particular emphasis is given on hydroprocessing reactions, including deoxygenation, cracking, and isomerization, which are essential to adjust fuel properties and meet aviation specifications. In this context, bifunctional heterogeneous catalysts play a crucial role, particularly regarding the influence of the metal phase and catalyst support on catalytic activity and stability. Different support classes, including metal oxides, mesoporous silicas, and zeolites, are discussed. Carbon-based materials, especially carbon nanotubes (CNT), are also highlighted due to their outstanding chemical and textural properties. Full article
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