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Open research questions in Thermochemical Biomass Conversion Processes

139 gap statements mined from Thermochemical Biomass Conversion Processes papers in our 4.5M-paper local library, which holds 2,662 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The lack of economic feasibility of biochar and hydrochar production due to high energy demands and costs. The need for more efficient and sustainable production methods for biochar and hydrochar. The limited understanding of the effects of biochar and hydrochar on soil properties and plant growth.

    Biochar and hydrochar from agro wastes: technological pathways, characteristics, and advances in soil amendment · 2026 · DOI

  • The lack of efficient and sustainable methods for bio-oil production from microalgae. The high oxygen and nitrogen content in bio-oil from microalgae pyrolysis, limiting its commercial application.

    In-depth into the mechanism of aromatic production from catalytic pyrolysis of wet-torrefied microalgae with HZSM-5 coated biochar · 2026 · DOI

  • The influence of CO2 on the co-pyrolysis characteristics of sewage sludge and poplar sawdust is not well understood. The thermal weight loss process of sewage sludge and poplar sawdust under CO2 atmosphere is not well studied.

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

  • The lack of efficient catalysts that can overcome mass transfer resistance, poor microwave absorption, and rapid coking. The need for advanced multi-site composites with synergistic mechanisms for achieving ultrafast localized heat transfer, targeted bond cleavage, and in-situ coking suppression. The requirement for scalable and cost-effective solutions for microwave-assisted pyrolysis.

    Microwave-Assisted Biomass Pyrolysis to Hydrocarbons: A Review of Catalyst Evolution from Single-Function to Multi-Site Composites · 2026 · DOI

  • The relationships between feedstock composition, processing pathway, and functional performance are not well understood. The structural characteristics of waste-derived carbon materials are not determined by feedstock composition alone. The processing route selection has a significant impact on the structural outcomes of the carbon materials.

    Carbon Materials Derived from Waste Streams: From Processing Pathways to Structure–Property–Function Relationships · 2026 · DOI

  • 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 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

  • 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

  • A full life-cycle assessment is required to confirm the carbon balance. The development of a scalable and cost-effective process for the fermentation of sugar to 3-HP. The exploration of other applications for the biochar and carbon fiber products.

    A Whole-Cane Carbon-Capture Biorefinery in Paraguay: Bio-Acrylonitrile Carbon Fiber Integrated with Bagasse Biochar · 2026 · DOI

  • The production of motor fuel components from polymer waste is a promising direction. The current methods for disposing of polymer waste have limitations.

    Polystyrene waste processing by the low-temperature pyrolysis method · 2026 · DOI

  • Further studies can investigate the effects of different temperature regimes on the properties of pyrocarbon-based suspensions. Research can focus on developing more efficient composite suspension fuels based on pyrocarbon.

    Thermorheopexy and structural stability of carbonaceous suspensions based on pyrocarbon · 2026 · DOI

  • There is a lack of understanding of the thermo-rheological behavior of composite suspension fuels based on pyrocarbon.

    Thermorheopexy and structural stability of carbonaceous suspensions based on pyrocarbon · 2026 · DOI

  • The growth in oil demand is not matched by the growth in oil production, especially in developing countries. There is a need for alternative sources of energy that can replace fossil petroleum.

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

  • The present study was limited to air-assisted thermogravimetric conditions; therefore, future work should investigate coal–bagasse blends under steam, oxygen-enriched air, and mixed gasifying atmospheres to further evaluate their suitability for industrial gasification systems.

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

  • There is a need for sustainable valorization alternatives for waste protein powder. The effects of process parameters on hydrochar yield and quality are not well understood.

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

  • The reaction conditions need to be optimized to improve the yield of butyl levulinate.

    Tungstophosphoric Acid (TPA) Supported on Magnetic Biochar from Sugar Palm Fibre (Arenga pinnata) as a Catalyst for Levulinic Acid Esterification to Butyl Levulinate · 2026 · DOI

  • Traditional research methods have significant disconnections between microscopic mechanism understanding, macroscopic performance prediction, and end-of-pipe pollution control. A contradiction exists between maintaining combustion stability and ensuring broad fuel adaptability.

    Progress in Biomass Combustion Systems for Ultra-Low Emissions · 2026 · DOI

  • 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

  • This review examined how ten underutilised food-processing residues in Turkey (as a representative agri-food context) can be valorised as biochar feedstocks and how their physicochemical profiles guide thermochemical pathway selection and application alignment.

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

  • Investigating the effects of biochar and hydrochar on soil properties and plant growth. Developing more efficient and sustainable production methods for biochar and hydrochar. Exploring the potential of biochar and hydrochar in other applications, such as water treatment and carbon sequestration.

    Biochar and hydrochar from agro wastes: technological pathways, characteristics, and advances in soil amendment · 2026 · DOI

  • Development of physics-informed AI modeling paradigms - Deeper co-design of multiple processes - Establishment of robust life-cycle assessment…

    Progress in Biomass Combustion Systems for Ultra-Low Emissions · 2026 · DOI

  • Further investigation of the mechanism of aromatics production from catalytic pyrolysis of wet-torrefied microalgae. Optimization of the catalytic pyrolysis conditions to improve the yield and selectivity of aromatics. Evaluation of the scalability and economic feasibility of the proposed method.

    In-depth into the mechanism of aromatic production from catalytic pyrolysis of wet-torrefied microalgae with HZSM-5 coated biochar · 2026 · DOI

  • Resolution of challenges that span feedstock management, process engineering, environmental compliance, economic viability, - Development of reactor configurations capable of handling heterogeneous feedstocks reliably, - Investigation of the relationships between feedstock composition, processing pathway, structural characteristics, and functional…

    Carbon Materials Derived from Waste Streams: From Processing Pathways to Structure–Property–Function Relationships · 2026 · DOI

  • Investigating the effect of different biomass types on the co-gasification process. Studying the co-gasification process at various temperatures. Examining the effect of other factors on the co-gasification process.

    Decoupling the Contributions of Alkali Metals and Volatiles to Synergistic Effects in Biomass-Petroleum Coke Co-Gasification · 2026 · DOI

Most-cited papers in Thermochemical Biomass Conversion Processes

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Open questions raised by papers listed on this page include: (1) The lack of economic feasibility of biochar and hydrochar production due to high energy demands and costs (“Biochar and hydrochar from agro wastes: technological pathways,…”, 2026); (2) The lack of efficient and sustainable methods for bio-oil production from microalgae (“In-depth into the mechanism of aromatic production from catalytic pyrolysis of…”, 2026); (3) The influence of CO2 on the co-pyrolysis characteristics of sewage sludge and poplar sawdust is not well understood (“The Influence of CO2 on Co-Pyrolysis Characteristics of Sewage Sludge and…”, 2026); (4) The lack of efficient catalysts that can overcome mass transfer resistance, poor microwave absorption, and rapid coking (“Microwave-Assisted Biomass Pyrolysis to Hydrocarbons: A Review of Catalyst…”, 2026); (5) The relationships between feedstock composition, processing pathway, and functional performance are not well understood (“Carbon Materials Derived from Waste Streams: From Processing Pathways to…”, 2026). 139 gap statements have been mined from Thermochemical Biomass Conversion Processes papers in our 4.5M-paper local library, which holds 2,662 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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