Synthesis and characterization of two novel large-pore crystalline vanadosilicates

被引:27
作者
Brandao, P
Philippou, A
Hanif, N
Ribeiro-Claro, P
Ferreira, A
Anderson, MW
Rocha, J [1 ]
机构
[1] Univ Aveiro, Dept Chem, P-3810193 Aveiro, Portugal
[2] Univ Aveiro, ESTGA, P-3810193 Aveiro, Portugal
[3] UMIST, Dept Chem, Manchester M60 1QD, Lancs, England
关键词
D O I
10.1021/cm010613q
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
Two novel large-pore sodium vanadosilicates (Aveiro-Manchester, structure numbers 13 and 14) containing stoichiometric amounts of vanadium (Si/V = 10 and 4, respectively) have been synthesized. Only one other example of a large-pore vanadosilicate (AM-6) is known. AM-13 and AM-14 were characterized by bulk chemical analysis (ICP); powder X-ray diffraction (XRD); scanning electron microscopy (SEM); thermogravimetric analysis (TGA); differential scanning calorimetry (DSC); N-2, n-hexane, benzene, and tripropylamine adsorption measurements; and Raman and diffuse reflectance ultraviolet-visible (DR UV-vis) spectroscopies. The acid-base and redox properties of these materials were assessed by 2-propanol conversion and ethanol oxidation, respectively. Both materials exhibit high selectivities to acetaldehyde, indicating that these two novel vanadosilicates are promising redox catalysts.:However, because the thermal stability of AM-14 is modest (ca. 350 degreesC), its potential use as a catalyst is limited.
引用
收藏
页码:1053 / 1057
页数:5
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