首页|焙烧镁铝水滑石脱除厌氧消化沼气中CO2的效果及机制

焙烧镁铝水滑石脱除厌氧消化沼气中CO2的效果及机制

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  • 国家科技期刊平台
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厌氧消化沼气中含有的CO2会降低沼气利用价值，高效去除CO2是沼气利用领域的研究热点。焙烧镁铝水滑石具有良好的CO2吸附性能，本文利用响应面法的Box-Behnken模型优化CO2吸附条件，考察吸附剂剂量、焙烧温度和反应温度对吸附效果的影响;通过吸附材料表征、吸附过程测定分析吸附作用机制。实验结果表明，吸附剂剂量、焙烧温度和反应温度均对CO2吸附有显著影响，最适宜的吸附条件为:投加量0。016g/mL、400℃焙烧、55℃反应。在此条件下，沼气中的CO2体积分数从23。51%降至0，CO2吸附容量为0。625mmol/g，CH4回收率为94。7%，经过6次循环吸附后，吸附剂仍具有良好的再生性能。吸附过程及吸附材料的X射线衍射、扫描电子显微镜、傅里叶变换红外光谱、比表面积、等电点及孔结构测试结果表明，焙烧镁铝水滑石的吸附过程十分迅速，表面碱性位点吸附及层间阴离子插层作用同时促进了CO2吸附。
Calcined Mg/Al hydrotalcites for CO2 removal in anaerobic digestion biogas:Performances and mechanisms
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.

calcined Mg/Al hydrotalcitesanaerobic digestion biogasCO2 adsorptionresponse surface methodology optimal designadsorption mechanisms

吴宇琦、李江涛、丁建智、宋秀兰、苏冰琴

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太原理工大学土木工程学院,山西 太原 030024

煤炭工业太原设计研究院集团有限公司,山西太原 030000

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

山西省基础研究计划(自由探索类)青年项目山西省高等学校科技创新项目太原理工大学2022年度校基金

2021030212230982021L0352022QN088

2024

10.16085/j.issn.1000-6613.2023-1272

化工进展
中国化工学会,化学工业出版社

化工进展

CSTPCD北大核心
影响因子：1.062
ISSN：1000-6613
年,卷(期)：2024.43(9)