One outstanding advantage of supercritical water gasification (SCWG) coupled with CO₂ capture and storage (CCS) technology is to realize the conversion of bio-waste into hydrogen-rich syngas. In this study, metal organic frameworks of copper benzene-1,3,5-tricarboxylate (Cu-BTC) were synthesized via solvothermal method with different synthesis time and used as adsorbent for capturing CO₂ from SCWG model syngas. The effect of synthesis time, adsorption temperature, and adsorption pressure on CO₂ adsorption capacity of Cu-BTC was evaluated using analysis of variance (ANOVA). The Pareto chart showed that adsorption pressure had significant effect on CO₂ adsorption capacity, and the surface plot indicated that CO₂ adsorption capacity increased with higher adsorption pressure and lower adsorption temperature. Cu-BTC with 48-h synthesis time had the largest specific surface area (1737 cm²/g) and pore volume (0.73 cm³/g), and it exhibited the highest CO₂ capacity of 19.83 mmol/g and 13.56 mmol/g at 0 °C and 25 °C, respectively. The adsorption results showed that CO₂ concentration in multi-component gas decreased from 48.75 to 12.9%, and H₂ concentration increased from 38.75 to 75.45%. Therefore, Cu-BTC has the potential for removal of CO₂ from SCWG syngas, and more work is necessary to further improve the adsorption capacity and selectivity.

Graphical abstract

中文翻译：

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Cu-BTC吸附CO2提高超临界水气化合成气质量

超临界水气化 (SCWG) 与 CO ₂捕集与封存 (CCS) 技术相结合的一个突出优势是实现将生物废物转化为富氢合成气。本研究采用溶剂热法合成不同合成时间的金属有机骨架苯-1,3,5-三羧酸铜(Cu-BTC)，并用作吸附剂从SCWG模型合成气中捕获CO _{2 。}使用方差分析 (ANOVA) 评估合成时间、吸附温度和吸附压力对 Cu-BTC 的 CO _{2吸附能力的影响。}帕累托图表明吸附压力对CO ₂吸附能力有显着影响，表面图表明CO ₂吸附容量随着吸附压力的升高和吸附温度的降低而增加。合成时间为48小时的Cu-BTC具有最大的比表面积（1737 cm ² /g）和孔体积（0.73 cm ³ /g），CO ₂容量最高，分别为19.83 mmol/g和13.56 mmol/ g 分别在 0°C 和 25°C。吸附结果表明，多组分气体中CO ₂浓度从48.75%下降到12.9%，H ₂浓度从38.75%上升到75.45%。_{因此，Cu-BTC具有从SCWG合成气中去除CO 2}的潜力，还需要做更多的工作来进一步提高吸附能力和选择性。

图形概要