ALUMINUM COMPLEXES IN PARTIALLY HYDROLYZED AQUEOUS ALCL3 SOLUTIONS USED TO PREPARE PILLARED CLAY CATALYSTS

被引:5
作者
PARKER, WO
KIRICSI, I
机构
[1] Eniricerche S.p.A.
关键词
AL3+ COMPLEXES; HYDROLYSIS; PILLARING AGENTS FOR INTERLAYERED CLAY MINERALS; NMR SPECTROSCOPY;
D O I
10.1016/0926-860X(95)85005-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Quantitative Al-27 nuclear magnetic resonance (NMR) spectroscopy was used to examine the partial hydrolysis with NaOH (OH/Al = 1.5, 2.0, 2.25, 2.5), and subsequent ageing at 353 K, of aqueous AlCl3 (0.25 mol dm-3). The sharp resonance of the tetrahedral aluminum (Td-Al) at the centre of the tridecamer [AlO4Al12(OH)24(OH2)12]7+, or Al13, was monitored to evidence the formation and decomposition of this cluster cation (a commonly used intercalant for interlayered clay minerals). The maximum amount of Al13 forms just after a turbid solution becomes clear (ca. 4 h at 353 K). After two days ageing, Al13 is largely transformed into Al24O72 (a 'defective' Al13 dimer). This preparation and ageing method is reproducible. An indirect method for verifying Td-Al substitution, knowing Al13 decomposition kinetics, is proposed.
引用
收藏
页码:L7 / L11
页数:5
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