Effects of ethylene glycol addition on the properties of Ru/Al2O3 catalyst prepared by sol-gel method

被引：10
|
作者：
Yang, JC
Shul, YG
机构：
来源：
CATALYSIS LETTERS | 1996年 / 36卷 / 1-2期
关键词：
sol-gel; Ru/Al2O3; ethylene glycol; characterization; chelating agent;
D O I：
10.1007/BF00807204
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：
Ru/Al2O3 catalysts were prepared by sol-gel method with an organic additive (ethylene glycol). The effect of the addition of ethylene glycol on the properties of Ru/Al2O3 was characterized by BET, XRD, EXAFS, and TGA/DTA. Ethylene glycol was effective to promote the phase transition of alpha-Al2O3 even at 800 degrees C calcination with high surface area. This finding is ascribed to the modified structure of aluminum alkoxide by ethylene glycol addition in the solution state. Ethylene glycol is also effective to get small particles of ruthenium after the reduction at 500 degrees C. The EXAFS and W-Vis spectra of Ru complex revealed that the coordination structure of Ru depended on the additive used. The ethylene glycol sol prefers to form octahedral Ru complex. This Ru complex in alumina matrix is stable up to 200 degrees C and forms small Ru oxide particles even at 300 degrees C calcination. This suggests that ethylene glycol coordinates to the Ru complex as well as to aluminum ion in the initial state, which is important to control the final properties of the Ru/Al2O3 catalyst.
引用
收藏
页码：41 / 49
页数：9
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