87343-69-9Relevant academic research and scientific papers
A Ta/W mixed addenda heteropolyacid with excellent acid catalytic activity and proton-conducting property
Li, Shujun,Peng, Qingpo,Chen, Xuenian,Wang, Ruoya,Zhai, Jianxin,Hu, Weihua,Ma, Fengji,Zhang, Jie,Liu, Shuxia
, p. 1 - 7 (2016)
A new HPAs H20[P8W60Ta12(H2O)4(OH)8O236]·125H2O (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 7.2×10?3?S?cm?1 (25?°C, 30% RH). Cyclic voltammograms of H-1 indicate the electrocatalytic activity towards the reduction of nitrite. Hammett acidity constant H0 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.
Method for synthesizing bis-ether compound by catalyzing benzaldehyde through mixed type heteropoly acid
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Paragraph 0015; 0016, (2017/05/18)
The invention discloses a method for synthesizing a bis-ether compound by catalyzing benzaldehyde through mixed type heteropoly acid. Benzaldehyde and an alcohol compound are used as raw materials and mixed type heteropoly acid is used as a catalyst, so as to conduct reaction to prepare the bis-ether compound, wherein the alcohol compound is methanol, n-butanol or ethylene glycol, the molecular formula of mixed type heteropoly acid is H20[P8W60Ta12(H2O)4(OH)8O236].125H2O, and mixed type heteropoly acid is formed by one tetrameric Ta/W mixed type heteropoly anion, 20 protons and 125 crystal water molecules. Prepared mixed type heteropoly acid has the strongest acidity in heteropoly acid known at present, and has higher acid catalytic activity due to the strong acidity.
