Thermally induced phase transformation on 12-tungstophosphoric acid/ZrO2 sol-gel

被引：8
|
作者：
Hernández-Cortéz, JG
López, T
Manríquez, ME
Gómez, R
Navarrete, J
机构：
[1] Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Mexico City 09340, DF, Mexico
[2] Inst Mexicano Petr, Mexico City 007730, DF, Mexico
来源：
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2003年 / 26卷 / 1-3期
关键词：
tungstophosphoric acid; sol-gel synthesis; ZrO2; sol-gel; ZrO2NH3-TPD; FTIR pyridine adsorption on ZrO2; Raman spectroscopy on sol-gel ZrO2;
D O I：
10.1023/A:1020794914686
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Zirconium (IV)-n-butoxide and tungstophosphoric acid (WP) were co-gelled at pH 3, 5 and 7 with HCl acid, C2H4O2 acid and NH4OH, respectively. Pyridine adsorption bands at 1610 and 1442 cm(-1) corresponding to Lewis acidic sites were observed by FTIR spectroscopy. Acidity determined by ammonia thermodesorption shows values around 1100 mumol of NH3/g, which correspond to solids showing super acidity. It was found that the incorporation of WP to gelling zirconia delay the formation of tetragonal zirconia. Raman spectroscopy shows the stabilization of the Keggin structure on zirconia thermally treated at 400degreesC.
引用
收藏
页码：213 / 216
页数：4
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