CIESC Journal ›› 2009, Vol. 60 ›› Issue (2): 507-513.
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SHI Qi;WU Sufang
Online:
Published:
师琦;吴素芳
Abstract:
SiO2 coated nano CaCO3 sorbents were prepared by using CO2 as precipitant and Na2SiO3 as silica source.TEM results showed that nano CaCO3 was coated by SiO2, and SEM & EDX tested Si content was 0.67%-4.93%.TGA was used to investigate the decomposition temperature and sorption properties under the condition of 600℃, 20% CO2 of absorbents.Compared with uncoated nano CaCO3, the decomposition temperature of SiO2 coated nano CaCO3 decreased by 9—42℃.With decreasing Si content, the cycle sorption ratio, cycle sorption capacity and sorption rate of SiO2 coated nano CaCO3 absorbents increased first but then decreased.The sample containing 1.05% Si had outstanding sorption properties.The 1st and 5th cycles sorption capacities were 8.9 mol·kg-1 and 6.0 mol·kg-1, 11% and 50% higher than uncoated nano CaCO3.The 5th cycle sorption rate of rapid reaction section was improved by 10% compared with uncoated nano CaCO3.SiO2 coated nano CaCO3 possessed higher sorption capacity and cycle sorption ratio, and better cycle stability than uncoated nano CaCO3.
Key words: 纳米CaCO3, 沉淀法, CO2吸附, 包覆, SiO2
纳米CaCO3,
摘要:
以CO2为沉淀剂,Na2SiO3为硅源,制备了SiO2包覆纳米CaCO3吸附剂。TEM测试证实纳米CaCO3表面包覆一层SiO2膜, 用SEM & EDX 测试5个包硅样品Si含量为0.67%~4.93%。采用TGA考察吸附剂的分解温度及600℃、20% CO2条件下的吸附性能。结果表明:采用CO2沉淀法包覆SiO2后,与未包硅的纳米CaCO3相比,分解温度降低9~42℃。纳米SiO2/CaCO3吸附剂的循环吸附率、吸附容量、吸附速率均随Si含量的减小先增加后降低。Si含量为1.05%的纳米SiO2/CaCO3吸附剂显示最佳吸附性能,第1、5次循环吸附容量分别为8.9、6.0 mol·kg-1,与未包覆SiO2的纳米CaCO3相比,分别提高11%、50%,同时在第5次循环快反应段吸附速率较纳米CaCO3提高10%。与纳米CaCO3相比,包硅后的吸附剂具有较高的吸附容量和循环吸附率,循环稳定性较好。
关键词: 纳米CaCO3, 沉淀法, CO2吸附, 包覆, SiO2
SHI Qi, WU Sufang. Properties of SiO2 coated nano SiO2/CaCO3 sorbents by precipitation method[J]. CIESC Journal, 2009, 60(2): 507-513.
师琦, 吴素芳. 沉淀法SiO2包覆纳米CaCO3吸附剂性能 [J]. 化工学报, 2009, 60(2): 507-513.
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https://hgxb.cip.com.cn/EN/Y2009/V60/I2/507
SHI Qi;WU Sufang;JIANG Mingzhe;LI Qinghui
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