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http://dx.doi.org/10.9713/kcer.2012.50.2.251

Etherification of n-Butanol to Di-n-Butyl Ether over H3+xPW12-xNbxO40 (x=0, 1, 2, 3) Keggin and H6+xP2W18-xNbxO62 (x=0, 1, 2, 3) Wells-Dawson Heteropolyacid Catalysts  

Kim, Jeong Kwon (School of Chemical and Biological Engineering, College of Engineering, Seoul National University)
Choi, Jung Ho (School of Chemical and Biological Engineering, College of Engineering, Seoul National University)
Yi, Jongheop (School of Chemical and Biological Engineering, College of Engineering, Seoul National University)
Song, In Kyu (School of Chemical and Biological Engineering, College of Engineering, Seoul National University)
Publication Information
Korean Chemical Engineering Research / v.50, no.2, 2012 , pp. 251-256 More about this Journal
Abstract
Etherification of n-butanol to di-n-Butyl Ether was carried out over Keggin $H_{3+x}PW_{12-x}Nb_xO_{40}$ (x=0, 1, 2, 3) and $H_{6+x}P_2W_{18-x}Nb_xO_{62}$ (x=0, 1, 2, 3) Wells-Dawson heteropolyacid catalysts. Niobium-substituted Keggin and Wells-Dawson heteropolyacid catalysts with different niobium content were prepared. Successful preparation of the catalysts was confirmed by FT-IR, ICP-AES, and $^{31}P$ NMR analyses. Their acid properties were determined by $NH_3$-TPD (Temperature-Programmed Desorption) measurements. Heteropolyacid catalysts showed different acid properties depending on niobium content in both series. The correlation between acid properties of heteropolyacid catalysts and catalytic activity was then established. Acidity of Keggin and Wells-Dawson heteropolyacid catalysts decreased with increasing niobium content, and conversion of n-butanol and yield for di-n-butyl ether increased with increasing acidity of the catalysts, regardless of the identity of heteropolyacid catalysts (without heteropolyacid structural sensitivity). Thus, acidity of heteropolyacid catalysts served as an important factor determining the catalytic performance in the etherification of n-butanol to di-n-Butyl Ether.
Keywords
Etherification; Di-n-Butyl Ether; Heteropolyacid Catalyst; Niobium; Acidity;
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Times Cited By KSCI : 2  (Citation Analysis)
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