碱金属基吸收剂干法脱除燃煤烟气CO2技术日益受到学术界的关注,其中钠基吸收剂廉价易得、经济性好,但碳酸化反应活性低.本文将Na2CO3负载于活性氧化铝并掺杂TiO2改性,利用CO2吸收/解吸流化床试验装置、XRD、SEM和氮吸附仪研究钠基二氧化碳吸收剂的流化床反应特性.结果表明:TiO2对Na2CO3/Al2O3在流化床中的碳酸化反应特性提升明显,反应时间缩短、反应速度提高、CO2吸收量增加;碳酸化反应产物为NaHCO3和Na5H3(CO3)4; TiO2对再生反应影响甚微;且TiO2在反应前后性状稳定,无副产物生成.尽管如此,TiO2的掺杂量应控制在一定的范围内以避免吸收剂微观结构恶化而阻碍反应.
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