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Conversion and High-Value Utilization of Biomass Resources

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A: Sustainable Energy".

Deadline for manuscript submissions: 24 April 2026 | Viewed by 754

Special Issue Editor


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Guest Editor
Department of Fundamental Engineering and Energetics, Institute of Mechanical Engineering, Warsaw University of Life Sciences, Nowoursynowska St. 164, 02-776 Warsaw, Poland
Interests: use of biomass for energy purposes; biomass conversion; drying biological materials; combustion; combustion equipment; heat and mass transfers; liquid biofuels and their application; design and construction of machines
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Special Issue Information

Dear Colleagues,

In the modern world, problems related to energy, its acquisition, or its conversion are important topics. The increase in the world’s population, the growing demand of societies for energy, and the shrinking resources of fossil fuels make it necessary to look for new energy sources, particularly renewable energy, which pollutes the natural environment to the least degree. New biomass and liquid biofuel conversion technologies are as important as the diversification of new energy sources. New technologies contribute to a more efficient use of biofuels and also make the obtained energy less harmful to the environment. All processes related to refining biofuels result in a significant increase in their value as fuel and open up new possibilities for their use in various industries as well as by individual consumers.

This Special Issue aims to present and disseminate the latest developments related to, e.g., enrichment, conversion processes, modeling, shaping, and the use of biofuels, as well as devices in which biofuels are used, along with determining their impacts on the surrounding environment.

Topics of interest for publication include, but are not limited to, the following:

  • Determination of physicochemical properties of biomass intended for high-quality biofuels;
  • All aspects related to biofuel conversion, such as modeling, theoretical and practical analyses, and computer simulations;
  • Enrichment of biomass, forming, thickening, drying, and grinding;
  • The processes of pyrolysis, gasification, and torrefaction of biomass;
  • The fermentation process, biogas plants, and biogas;
  • Liquid biofuel, esters, and ethanol;
  • Use of agricultural and forestry waste for energy purposes;
  • Use of food industry waste for energy purposes;
  • Designing a line for the production of biofuels or its individual elements;
  • Modeling of processes related to energy production from biofuels;
  • Technical and economic analyses, including the determination of efficiency and environmental impacts;
  • Analysis of the impact of the use of biofuels on the environment;
  • Thermal and thermogravimetric analyses;
  • Designing biomass burning equipment;
  • Analysis of the composition of flue gases resulting from the combustion of high-quality fuels.

Dr. Andrzej Bryś
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. Energies 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 2600 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
  • biomass conversion
  • pellet
  • combustion
  • exhaust emissions
  • waste management
  • heat flow
  • computer modeling and simulations

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Published Papers (1 paper)

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Research

23 pages, 3064 KB  
Article
Comparing Ecuadorian Cocoa Mucilage-Based Bio-Ethanol and Commercial Fuels Toward Their Performance and Environmental Impacts in Internal Combustion Engines
by Cristian Laverde-Albarracín, Juan Félix González González, Beatriz Ledesma Cano, Silvia Román Suero, José Villarroel-Bastidas, Diego Peña-Banegas, Samantha Puente-Bosquez and Sebastian Naranjo-Silva
Energies 2025, 18(24), 6378; https://doi.org/10.3390/en18246378 - 5 Dec 2025
Viewed by 467
Abstract
In response to Ecuador’s need for sustainable and locally sourced transport fuels, this study evaluates the energetic and environmental performance of a biofuel (bioethanol-based) derived from the mucilage of the CCN51 cocoa variety, analyzed under controlled operating conditions in an internal combustion engine. [...] Read more.
In response to Ecuador’s need for sustainable and locally sourced transport fuels, this study evaluates the energetic and environmental performance of a biofuel (bioethanol-based) derived from the mucilage of the CCN51 cocoa variety, analyzed under controlled operating conditions in an internal combustion engine. Bioethanol obtained from this feedstock was blended with Ecuador’s commercial Extra gasoline to produce an E5 formulation, experimentally compared with Extra (85 RON) and Super (92 RON) fuels. Physicochemical analysis following NTE INEN 2102 revealed a research octane number of 85.8 and a lower heating value of 45.22 MJ/kg. Static tests performed on a Hyundai i10 engine (2021) at 700 and 2500 rpm showed that the E5 blend achieved higher energy and exergy efficiencies (21.17% and 64.12%, respectively) than Extra gasoline, approaching Super performance. Environmentally, the E5–CCN51 blend reduced carbon monoxide (CO) by ~10–15% and unburned hydrocarbons (HC) by ~5–8%, while maintaining λ ≈ 1. Variations in O2 and CO2 confirmed enhanced oxidation and more complete combustion. Overall, these findings demonstrate the technical feasibility and environmental relevance of CCN51 cocoa mucilage as a sustainable ethanol source, contributing to cleaner combustion, circular bioeconomy promotion, and energy resilience in tropical developing regions. Full article
(This article belongs to the Special Issue Conversion and High-Value Utilization of Biomass Resources)
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