Properties of SiO<sub>2 </sub>coated nano SiO2/CaCO<sub>3 </sub>sorbents by precipitation method

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Properties of SiO₂coated nano SiO2/CaCO₃sorbents by precipitation method

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- Properties of SiO₂coated nano SiO2/CaCO₃sorbents by precipitation method
- CIESC Journal Issue 2, Pages: 507-513(2009)
- 作者机构：
  
  浙江大学化工系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：05 February 2009，
  
  Published：05 February 2009
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SHI Qi, WU Sufang. Properties of SiO₂coated nano SiO2/CaCO₃sorbents by precipitation method[J]. CIESC Journal, 2009, (2): 507-513.
DOI：

SHI Qi, WU Sufang. Properties of SiO₂coated nano SiO2/CaCO₃sorbents by precipitation method[J]. CIESC Journal, 2009, (2): 507-513. DOI：

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。

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.

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