THE INFLUENCE OF CALCINATION TEMPERATURE ON PD DISPERSION AND HYDROGEN SOLUBILITY IN PD/SIO2

被引：28
作者：
SEPULVEDA, JH [1 ]
FIGOLI, NS [1 ]
机构：
[1] UNL,CONICET,FIQ,INCAPE,SANTIAGO ESTERO 2654,RA-3000 SANTA FE,ARGENTINA
来源：
APPLIED SURFACE SCIENCE | 1993年 / 68卷 / 02期
关键词：
D O I：
10.1016/0169-4332(93)90130-4
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：
The relation between Pd particle size and hydrogen solubility in Pd/SiO2 was quantitatively studied by means of several techniques such as TPR, hydrogen TPD, TRS, TEM and H-2 chemisorption. When correlating solubility, defined as H(b)/Pd(t), with dispersion, two zones were observed: one for high dispersion values having a H(b)/Pd(t) ratio of 0.36 and the other having higher values, for lower dispersions. The hydrogen solubility in bulk Pd (H(b)/Pd(b)) has a constant value of 0.7 for dispersions up to 80%; for very small metal particles this value increases up to 6.
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页码：257 / 264
页数：8
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