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http://dx.doi.org/10.9713/kcer.2013.51.2.208

The Effect of the Crystalline Phase of Zirconia for the Dehydration of Iso-propanol  

Sim, Hye-In (Department of Chemical Engineering, Chungbuk National University)
Park, Jung-Hyun (Department of Chemical Engineering, Chungbuk National University)
Cho, Jun Hee (Department of Chemical Engineering, Chungbuk National University)
Ahn, Ji-Hye (Department of Chemical Engineering, Chungbuk National University)
Choi, Min-Seok (Department of Chemical Engineering, Chungbuk National University)
Shin, Chae-Ho (Department of Chemical Engineering, Chungbuk National University)
Publication Information
Korean Chemical Engineering Research / v.51, no.2, 2013 , pp. 208-213 More about this Journal
Abstract
Zirconium hydroxide was synthesized by varying the aging time of the zirconyl chloride octahydrate at $100^{\circ}C$ in aqueous solution and the resulting hydroxides were calcined at $700^{\circ}C$ for 6 h to obtain the crystalline $ZrO_2$. The materials used in this study were characterized by differential thermal analysis (DTA), X-ray diffraction (XRD), $N_2$-sorption, transmission electron microscopy (TEM), $NH_3$ temperature-programmed desorption ($NH_3$-TPD), $CO_2$-TPD and iso-propanol TPD analyses to correlate with catalytic activity for the dehydration of iso-propanol. The pure tetragonal $ZrO_2$ phase was obtained after 24 h aging of zirconium hydroxide and successive calcination at $700^{\circ}C$. The increase of aging time showed the production of smaller particle size $ZrO_2$ resulting that the higher specific surface area and total pore volume. $NH_3$-TPD results revealed that the relative acidity of the catalysts increased along with the increase of aging time. On the other hand, the results of $CO_2$-TPD showed the reverse trend of $NH_3$-TPD results. The best catalytic activity for the dehydration of iso-propanol to propylene was shown over $ZrO_2$ catalyst aged for 168 h which had the highest $S_{BET}$ ($178\;m^2\;g^{-1}$). The catalytic activity could be correlated with high surface area, relative acidity and easy desorption of iso-propanol.
Keywords
Zirconia; IPA Dehydration; Aging Time; IPA TPD; $NH_3$ TPD;
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