化工进展2024，Vol.43Issue(9)：5250-5261,12.DOI:10.16085/j.issn.1000-6613.2023-1272
焙烧镁铝水滑石脱除厌氧消化沼气中CO2的效果及机制
Calcined Mg/Al hydrotalcites for CO2 removal in anaerobic digestion biogas:Performances and mechanisms
摘要
Abstract
Carbon dioxide(CO2)in the anaerobic digestion biogas can decrease the utility value of biogas,and removing CO2 efficiently is the research hotspot in the biogas utilization area.Calcined Mg/Al hydrotalcites(CLDHs)has desirable CO2 adsorption property.In this study,Box-Behnken model in the response surface methodology was applied to optimize the condition for CO2 adsorption by CLDHs,and the effects of adsorbents dosage,calcination temperature and reaction temperature on adsorption performances were investigated.The CO2 adsorption mechanisms were analyzed by adsorbents characterization and adsorption process test.Experimental results indicated that adsorbents dosage,calcination temperature and reaction temperature all showed significant effects on CO2 adsorption performance,and the optimal adsorption conditions were:CLDHs dosage of 0.016g/mL,calcination temperature of 400℃and reaction temperature of 55℃.Under the optimal conditions,CO2 content decreased from initial 23.51%to 0,and CO2 adsorption capacity of 0.625mmol/g and CH4 recovery rate of 94.7%were achieved.Meanwhile,adsorbent had desirable regeneration property after 6 cycles of adsorption-desorption.The adsorption process test and adsorbents characterization results,including X-ray diffractometer(XRD),Scanning electron microscopy(SEM),Fourier transform infrared(FTIR),specific surface area,point of zero charge and pore structure,revealed that the CO2 adsorption process was very quick,and the surface basic sites adsorption as well as layer anion intercalation promoted CO2 adsorption simultaneously.关键词
焙烧镁铝水滑石/厌氧消化沼气/CO2吸附/响应面法优化设计/吸附机理Key words
calcined Mg/Al hydrotalcites/anaerobic digestion biogas/CO2 adsorption/response surface methodology optimal design/adsorption mechanisms分类
资源环境引用本文复制引用
吴宇琦,李江涛,丁建智,宋秀兰,苏冰琴..焙烧镁铝水滑石脱除厌氧消化沼气中CO2的效果及机制[J].化工进展,2024,43(9):5250-5261,12.基金项目
山西省基础研究计划(自由探索类)青年项目(202103021223098) （自由探索类）
山西省高等学校科技创新项目(2021L035) （2021L035）
太原理工大学2022年度校基金(2022QN088). （2022QN088）
