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http://dx.doi.org/10.5855/ENERGY.2014.23.4.141

Structure direct agent-assisted hydrothermal synthesis and small gases adsorption behavior of pure RHO zeolite  

Kim, Beom-Ju (Graduate School of Energy Science and Technology, Chungnam National University)
Sharma, Pankaj (Graduate School of Energy Science and Technology, Chungnam National University)
Han, Moon-Hee (Graduate School of Energy Science and Technology, Chungnam National University)
Cho, Churl-Hee (Graduate School of Energy Science and Technology, Chungnam National University)
Publication Information
Journal of Energy Engineering / v.23, no.4, 2014 , pp. 141-149 More about this Journal
Abstract
In the present study, pure RHO zeolite was hydrothermally synthesized by using 18-crown-6 ether as a structure directing agent(SDA), and the small gases adsorption was investigated. Synthesized RHO zeolite was a cube shape particle of which average edge length was around $1.2{\mu}m$ and composed of primary crystallites having a diameter of around 100 to 200 nm. RHO zeolite structure was stable under 3h calcination at $600^{\circ}C$. Water adsorption data announced that RHO zeolite has a specific surface area of 483.32 m2/g and its micropore diameter was about 4 A. Gas adsorption was studied in the pressure range of 50 to 500 kPa for $CO_2$, $N_2$, $O_2$ and $H_2$. It was evident that RHO zeolite showed a strong $CO_2$ adsorption behavior. Especially, RHO zeolite showed a transient $CO_2$ adsorption behavior. The 3h $CO_2$ up-take at 50 kPa and 500 kPa was 1.283 and 3.357 mmol/g, respectively. The $CO_2/H_2$ selectivity was around 16 at 500 kPa. Compared with gas adsorption data for some representative microporous adsorbents, it was certain that RHO zeolite is a beneficial adsorbent for $CO_2/H_2$ separation.
Keywords
RHO zeolite; hydrothermal synthesis; gas adsorption;
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