Adsorption of CO2 on FSM-type mesoporous silicas
Adsorption of CO2 on FSM-type mesoporous silicas
复制标题
FSM 型介孔二氧化硅对 CO2 的吸附
DOI：
10.1039/b004505p
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发表时间：
2000
影响因子：
3.3
通讯作者：
T. Tomida
中科院分区：
文献类型：
--
作者：
M. Katoh;K. Sakamoto;Mituo Kamiyamane;T. Tomida
制备了不同孔径的FSM型介孔氧化硅（FSM-10、FSM-12、FSM-14、FSM-16），并研究了其对CO2的吸附性能。测定了FSM的CO2吸附量和吸附CO2后FSM表面硅醇基团的红外光谱。CO2的等排吸附热结果表明，MSM-10和MSM-12都是吸附CO2的能量均相吸附剂。另一方面，FSM-14和FSM-16都具有能量不同的吸附位点。FSM-14的能量较高的吸附位点的数量少于FSM-16。FSM-14和FSM-16的游离硅烷醇基团的IR光谱的结果与等量吸附热的结果一致。FSM-14吸附的CO2量
而FSM-16（FSM-12除外）对CO_2-N_2混合气体（CO_2/N_2 =20.1/79.9
迅速与
总压力从0.4 MPa增加到0.5 MPa。
FSM-type mesoporous silicas with different pore sizes (FSM-10 with 1.7 nm, FSM-12 with 2.1 nm, FSM-14 with 2.3 nm and FSM-16 with 2.8 nm) were prepared and studied to use as adsorbents for CO2. The amount of adsorbed CO2 and the IR spectra of surface silanol groups of FSM after CO2 adsorption were measured. The results of isosteric heat of adsorption of CO2 indicated that both FSM-10 and FSM-12 were energetically homogeneous adsorbents for adsorption of CO2. On the other hand, both FSM-14 and FSM-16 had energetically different adsorption sites. The number of energetically higher adsorption sites of FSM-14 was fewer than that of FSM-16. The results of the IR spectra for free silanol groups of FSM-14 and FSM-16 were compatible with the results for isosteric heat of adsorption. The amount of CO2 adsorbed on FSM-14
and FSM-16, except for FSM-12, from CO2–N2 gas mixtures (CO2/N2=20.1/79.9) as capillary condensation increased
rapidly with
an increase in the total pressure from 0.4 to 0.5 MPa.