Researchers evaluated four biomass and renewable power routes for green methanol production, finding that integrating biomass gasification with renewable hydrogen balances carbon utilization and energy efficiency at 92 percent and 54 percent, respectively, according to a study published in Nature Communications. Green methanol could help decarbonize transport and industry, though production planning faces tight links between biomass conversion, renewable hydrogen supplies, electricity emissions, and power costs.
Direct combustion followed by carbon dioxide hydrogenation reached 96 percent carbon utilization, though the process required substantially more hydrogen produced through electrolysis. The researchers based their findings on industrial process parameters and pilot-scale data gathered from the RunTsing Gasifier, an opposed-flow fixed-bed gasifier co-developed by Tsinghua University and Suzhou RunTsing Environmental & Energy Sci-Tech Co., Ltd.
Gasification without added hydrogen currently offers the lowest production cost among the four pathways. Hydrogen-integrated gasification approaches the cost of that unassisted route when renewable electricity prices fall below US$21 per megawatt-hour. It also matches coal-based methanol production costs when carbon prices reach US$40 to US$90 per tonne of carbon dioxide.
Under hybrid wind and solar power supplies, every evaluated route remained below the European low-carbon fuel threshold. To stay within that regulatory limit, the maximum compatible electricity emission factors ranged between 0.057 and 0.373 kilograms of carbon dioxide equivalent per kilowatt-hour across the configurations.
Co-lead authors Sheng Zhao and Jingran Zhang developed the study with researchers from Tsinghua University, Harvard University, and Wageningen University & Research. The National Key R&D Program of China supported the work under grant number 2023YFE0206000, with RunTsing Company providing data from its self-funded pilot trials.
