Synthesis and Characterization of an Ultramicroporous Cesium Hydrogen Salt of 12-Tungstophosphoric Acid, Cs2.1H0.9PW12O40
Synthesis and Characterization of an Ultramicroporous Cesium Hydrogen Salt of 12-Tungstophosphoric Acid, Cs2.1H0.9PW12O40
复制标题
12-钨磷酸超微孔铯氢盐 Cs2.1H0.9PW12O40 的合成与表征
DOI：
10.1246/bcsj.71.2727
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发表时间：
1998
影响因子：
4
通讯作者：
T. Okuhara
中科院分区：
文献类型：
--
作者：
T. Yamada;Y. Yoshinaga;T. Okuhara
以H3PW12O40和Cs2CO3为原料，采用滴定法制备了超微孔杂多化合物Cs2.1H0.9PW12O40。确定了原料浓度和Cs2CO3溶液滴加速率，合成了微孔均匀、外表面积很小的Cs2.1H0.9PW12O40。N_2等温线的Dollimore-Heal方法表明，在控制条件下制备的Cs2.1H0.9PW12O40没有中孔。对不同大小分子的吸附实验表明，Cs2.1H0.9PW12O40的微孔尺寸在0.43~0.59 nm之间，外比表面积小于总比表面积的3%。根据Cs2.1H0.9PW12O40的孔径、孔容和原始微晶尺寸，提出了一种独特的超微孔模型，其中超微孔是以Cs2.1H0.9PW12O40为主要颗粒的微晶晶面之间形成的空间。
An ultramicroporous heteropoly compound, Cs2.1H0.9PW12O40, was synthesized by a titration method using aqueous solutions of H3PW12O40 and Cs2CO3. Concentrations of the starting materials and the drop rate of Cs2CO3 solution were determined to synthesize Cs2.1H0.9PW12O40 having nearly uniform micropores and very low external surface area. The Dollimore-Heal method of N2 isotherms showed that Cs2.1H0.9PW12O40 prepared by the controlled conditions has no mesopores. Adsorption of various molecules having different sizes revealed that the micropore size of Cs2.1H0.9PW12O40 was in the range from 0.43 to 0.59 nm and the fraction of the external surface area was less than 3% of the total surface area. A model for the unique ultramicropores has been proposed on the basis of the pore size, pore volume, and the primary crystallite size, in which the ultramicropores are spaces formed between the crystal faces of the mcirocrystallites as the primary particles of Cs2.1H0.9PW12O40.