Biomass is carbon-neutral and has the carbon-negative potential if combined with carbon capture and storage (CCS). This study investigated the thermochemical conversion to high-purity hydrogen of a typical lignite (BYH) and seaweed biomass (BS) with carbon capture in a designed fixed-bed reactor at moderate conditions (1 atm, 873 K). High-purity hydrogen of 486.91–801.5 ml/g-blends with suppressed CO₂ formation was produced in the alkaline gasification. The alkali can decompose the coal/biomass molecular structures, in-situ capture CO₂ and control the gases to high-purity H₂ (80.1%–93.2%). The synergistic effect of coal and biomass changes the gas evolution behaviors and impacts the chemical structures of the char. The abundant SiO₂ and Al₂O₃ in the coal can inhibit the catalytic activities of earth alkali metals in the biomass, but not much. These results are significant to the future development of low-carbon renewable energy techniques.

生物质是碳中性的，如果与碳捕获和储存 (CCS) 结合使用，则具有碳负潜力。本研究调查了典型褐煤 (BYH) 和海藻生物质 (BS) 在设计的固定床反应器中在中等条件 (1  atm, 873  K) 中通过碳捕获热化学转化为高纯度氢气的过程。在碱性气化过程中产生了 486.91–801.5  ml/g 的高纯度氢气，并抑制了 CO _{2 的}形成。碱可分解煤/生物质分子结构，原位捕获CO ₂并将气体控制为高纯度H ₂(80.1%–93.2%)。煤和生物质的协同作用改变了气体的析出行为并影响了炭的化学结构。煤中丰富的SiO ₂和Al ₂ O ₃能抑制生物质中碱土金属的催化活性，但作用不大。这些成果对低碳可再生能源技术的未来发展具有重要意义。