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Open research questions in Thermochemical Biomass Conversion Processes

75 unresolved questions extracted from the limitations and future-work sections of 714 Thermochemical Biomass Conversion Processes papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The study identifies a gap in the understanding of the effects of carbonization and pelletization on biomass properties. The research aims to address the limitations of traditional biomass energy production methods.

    A Study on Calorific Value Enhancement of Biomass through Carbonization and Pelletization · 2026 · DOI

  • The variability in physicochemical properties of food-processing residues. The lack of standardized methods for characterizing and evaluating residues for biochar applications. The need for a region-specific approach to address the unique challenges and opportunities of different regions.

    Biochar from food processing wastes: a multi-criteria roadmap for circular energy and environmental applications · 2026 · DOI

  • The need for alternative sources of energy that can replace fossil petroleum. The environmental pollution caused by the disposal of waste polyolefins. The technical challenges of converting waste polyolefins into liquid fuels.

    Production of liquid fuel by pyrolysis of waste polyolefins · 2026 · DOI

  • The direct use of low-rank coal is often limited by high moisture or ash content and lower fuel quality. The co-gasification of coal and biomass is a complex process.

    Thermogravimetric Evaluation of Coal–biomass Blends for Industrial Applications: Effects of operating parameters on kinetic behavior and mitigating environmental impact · 2026 · DOI

  • Methane emissions, leachate formation, and air pollutants associated with conventional disposal routes. Regulatory and quality concerns restricting diversion to animal feed. The need for sustainable valorization alternatives.

    Hydrothermal carbonization of waste protein powder for production of energy-dense hydrochars · 2026 · DOI

  • The development of sustainable and environmentally friendly materials for oil-water separation. The need for effective pretreatment methods to enhance the performance of moss.

    Application of Moss Plant (Barbula Indica) as a Sustainable Material for Oil-Water Separation · 2026 · DOI

  • The continuous growth in plastic production and disposal presents significant environmental challenges. Conventional waste plastic management faces a wide range of challenges. There is a need for sustainable and scalable waste valorization technologies.

    Carbon footprint analysis of waste plastic-to-fuel pyrolysis: implications of feedstock composition and processing conditions · 2026 · DOI

  • Economical production of levulinic acid from lignocellulosic biomass is necessary for its industrial scale upgrading. The study needs to investigate the effects of various parameters on LA yield. The techno-economic analysis needs to estimate the minimum selling price of the resulting mixed sugar stream.

    Effects of chemical preconditioning on organic acid production from woody biomass · 2026 · DOI

  • High energy consumption due to high temperatures required for graphitization. Limited understanding of the effect of graphitization on the crystallinity of coconut shell carbon.

    Studi Awal Perlakuan Termal Grafitisasi Tempurung Kelapa dan Pengaruhnya terhadap Tingkat Kristalinitas Karbon · 2026 · DOI

  • There is a need to develop new adsorbents for CO2 capture from biomass waste. The paper identifies a gap in the literature for the use of hydrothermal carbonization to produce hydrochar from African elemi shells.

    Valorization of African Elemi Shell Waste Into Porous Hydrochar Via Hydrothermal Carbonization for Carbon Capture Applications · 2026 · DOI

  • The complexity of biomass conversion processes. The need for efficient and selective catalysts. The challenge of generating valued-added products.

    Production of high-quality hydrochar and value liquids from biomass waste via wet torrefaction over zeolite catalysts · 2026 · DOI

  • However, it remains unclear how ash and biomass properties govern the magnitude of this catalytic effect.

    Increasing BiocharYield in Pyrolysis by Adding Ash · 2026 · DOI

  • Non-uniform electromagnetic field distribution can cause temperature gradients and localized hotspot formation. Microwave penetration in biomass is restricted, making scale-up hard. The efficiency of magnetron-based microwave generators is limited, ranging from 50% to 70%.

    Conventional and microwave-assisted pyrolysis biochars: comparative mechanistic insights, structural evolution, and environmental remediation applications · 2026 · DOI

  • The presence of harmful substances in sewage sludge. The potential secondary environmental hazards of conventional treatment methods. The need for more efficient and sustainable co-pyrolysis technologies.

    The Influence of CO2 on Co-Pyrolysis Characteristics of Sewage Sludge and Poplar Sawdust · 2026 · DOI

  • Further studies are needed to investigate the influence of CO2 on the co-pyrolysis characteristics of sewage sludge and poplar sawdust. The development of more efficient and sustainable co-pyrolysis technologies is needed.

    The Influence of CO2 on Co-Pyrolysis Characteristics of Sewage Sludge and Poplar Sawdust · 2026 · DOI

  • The need to maximize the utilization of crude oil feedstocks and convert vacuum residue into valuable products. The lack of efficient technologies for the conversion of vacuum residue into mid-distillates.

    Steam-assisted pyrolysis of vacuum residue to mid-distillates over Fe/AC catalyst promoted with potassium and magnesia · 2026 · DOI

  • The lack of a sustainable and efficient method for valorizing cottonseed hull residues. The need for a renewable, locally available, and low-cost alternative to conventional fuels.

    Response surface methodology for optimizing the higher heating value of biochar briquettes prepared by pyrolysis and densification of cottonseed shells (Gossypium hirsutum) · 2026 · DOI

  • • Integration of kinetics data and validation of the simulation model using pilot- and lab-scale experimental data. • SEM analysis of pyrolysis char to link kinetics data with material characteristics. • Based on the successful 1 MWth pilot-scale demonstration of organic waste conversion in CFB reactors, the next step is industrial-scale design and implementation. 12. 05. 2 026 Technische Universität Darmstadt | Energy Systems & Technology | Prof. Dr. -Ing. B.

    Pyrolysis and Gasification Kinetics of Various Organic Waste Feedstocks for Emerging Conversion Pathways in CFB Reactors · 2026 · DOI

  • The need for a sustainable and eco-friendly alternative energy source. The potential of biomass to undergo diverse thermochemical conversion technologies.

    Production of high-quality hydrochar and value liquids from biomass waste via wet torrefaction over zeolite catalysts · 2026 · DOI

  • Low-temperature pyrolysis around 250 °C represents a mild carbonization that differs from conventional high-temperature biochar production, and the role of pyrolysis duration under mild thermal conditions remains insufficiently understood.

    Effects of Feedstock Type and Pyrolysis Duration on Functional Properties of Biomass-Derived Charred Materials Under Low-Temperature Pyrolysis · 2026 · DOI

  • The development of harmonized datasets and application-specific performance measurements. The extension of the framework to other regions and residue types. The investigation of the effects of pyrolysis parameters and post-treatments on biochar properties.

    Biochar from food processing wastes: a multi-criteria roadmap for circular energy and environmental applications · 2026 · DOI

  • Conventional waste treatment methods have low efficiency and are not environmentally sustainable. There is a need for eco-friendly thermochemical processes for converting biomass into high-energy-density solid fuels.

    Fuel quality improvement and energy performance through co-hydrothermal carbonization of swine manure and coffee waste · 2026 · DOI

  • advantageous as it eliminates the need for energy-intensive drying processes, making it cost-effective and environmentally friendly (Lee et al., 2021). Conducted at moderate temperatures (180 °C–250 °C) under autogenous pressure, HTC facilitates dehydration to increased carbon content and reduced oxygen levels in the biomass (Gascó et al., 2018; Massaya et al., 2021). The resulting hydrochar exhibits a high energy density, reduced oxygen content, and improved combustion characteristics, making it suitable for long-term storage and handling (Zhao et al., 2021). Recent studies suggest that co-hydrothermal carbonization to overcome the limitations of single-feedstock HTC (Ipiales et al., 2023). Recent studies have highlighted that synergistic effects between diverse biomass types can significantly enhance hydrochar properties, particularly through interactions between ash-forming minerals and lignin-derived aromatics (Dang et al., 2023; Ighalo et al., 2025). These findings suggest that coprocessing feedstocks with complementary compositions may optimize hydrochar characteristics through mechanisms not achievable with single feedstocks. Co-HTC enhances fuel properties while mitigating individual feedstock by co-processing multiple biomass sources (Islam and Reza, 2023; Lang et al., 2018). is a promising alternative the drawbacks of (Co-HTC) et al. (Hu recent study by Dang SM and coffee waste (CW) are two types of organic wastes that require immediate and effective management due to their environmental impacts (Xiong et al., 2019). SM contains high nitrogen and sulfur levels, posing risks of water contamination and eutrophication, while its high ash content can lower fuel quality (Gascó et al., 2018; Lang et al., 2022). In contrast, CW is characterized by a high fixed carbon content and low ash levels, making it a promising feedstock for high-quality hydrochar et al., 2022; Kumar et al., 2021). production Furthermore, (2024) demonstrated that applying tailored HTC conditions to spent coffee grounds can significantly enhance the fuel properties and improve the energy recovery potential. However, under HTC conditions, lignin in CW is relatively recalcitrant compared to cellulose and hemicellulose, but it can undergo partial depolymerization releasing phenolic intermediates into the process water, followed by dominant condensation and repolymerization into stable aromatic structures in hydrochar (Dang et al., 2024). While CW’s high lignin content makes it suitable for producing energy-dense hydrochar, its low nitrogen content limits nutrient recovery potential.

    Fuel quality improvement and energy performance through co-hydrothermal carbonization of swine manure and coffee waste · 2026 · DOI

  • The optimization of pyrolysis systems is constrained by technical and infrastructural limitations. The study is limited to experimental and pilot-scale studies. The paper does not provide a comprehensive analysis of the economic and environmental impacts of pyrolysis systems.

    Pyrolysis Reactor Design and Suitability for Decentralized Waste-to-Energy Systems in Sub-Saharan Africa: A Systematic Review · 2026 · DOI

  • To develop more efficient and scalable pyrolysis systems. To evaluate the economic and environmental impacts of pyrolysis systems. To analyze the potential of pyrolysis for waste-to-energy conversion in other regions.

    Pyrolysis Reactor Design and Suitability for Decentralized Waste-to-Energy Systems in Sub-Saharan Africa: A Systematic Review · 2026 · DOI

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75 open questions have been extracted from the limitations and future-work passages of 714 Thermochemical Biomass Conversion Processes papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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