Acidity and acid catalysis of polyatom-substituted HnPW11M1O40 (M=V, Nb, Ta, and W) Keggin heteropolyacid catalysts

作者：Park Dong Ryul; Hong Ung Gi; Song Sun Ho; Seo Jeong Gil; Baeck Sung Hyeon; Chung Jin Suk; Song In Kyu^*

来源：Korean Journal of Chemical Engineering, 2010, 27(2): 465-468.

DOI：10.1007/s11814-010-0082-1

• Heteropolyacid
• Polyatom Substitution
• Acid Catalysis
• Dehydration of Cyclohexanol

Acidity of polyatom-substituted HnPW11M1O40 (M =V, Nb, Ta and W) Keggin heteropolyacids (HPAs) was measured by NH3-TPD experiments. Acidity decreased in the order of H3PW11W1O40>H4PW11V1O40>H4PW11Nb1O40 >H4PW11Ta1O40. Vapor-phase dehydration of cyclohexanol was conducted as a model reaction to correlate the acidity with die acid catalysis of HPA catalysts. Yield for cyclohexene (a product by acid catalysis) increased with increasing acidity of HnPW11M1O40 (M=V, Nb, Ta, and W) HPA catalysts. The acidity of HnPW11M1O40 (M=V, Nb, Ta, and W) HPA catalysts could be utilized as a probe of acid catalysis for dehydration of cyclohexanol.

• 出版日期2010-3