A Ta/W mixed addenda heteropolyacid with excellent acid catalytic activity and proton-conducting property

作者：Li, Shujun; Peng, Qingpo; Chen, Xuenian^*; Wang, Ruoya; Zhai, Jianxin; Hu, Weihua; Ma, Fengji^*; Zhang, Jie^*; Liu, Shuxia

来源：Journal of Solid State Chemistry, 2016, 243: 1-7.

DOI：10.1016/j.jssc.2016.08.003

• Acid catalysis
• Heteropolyacid
• Ion-exchange
• Proton conduction
• Tantalum

A new HPAs H-20[P8W60Ta12(H2O)(4)(OH)(8)O-236]center dot 125H(2)O (H-1) which comprises a Ta/W mixed addenda heteropolyanion, 20 protons, and 125 crystalline water molecules has been prepared through ion-exchange method. The structure and properties of H-1 have been explored in detail. AC impedance measurements indicate that H-1 is a good solid state proton conducting material at room temperature with a conductivity value of 7.2 x 10(-3) S cm(-1) (25 degrees C, 30% RH). Cyclic voltammograms of H-1 indicate the electrocatalytic activity towards the reduction of nitrite. Hammett acidity constant Ho of H-1 in CH3CN is -2.91, which is the strongest among the present known HPAs. Relatively, H-1 exhibits excellent catalytic activities toward acetal reaction.

• 出版日期2016-11
• 单位安阳师范学院; 河南师范大学; 东北师范大学