MASS-SPECTROMETRY AND IN-SITU INFRARED DIFFUSE-REFLECTANCE ANALYSIS OF THE DECOMPOSITION OF HCOOH ADSORBED ON LN2O3-PROMOTED RH/AL2O3 CATALYSTS

被引:6
作者
BENITEZ, JJ [1 ]
CARRIZOSA, I [1 ]
ODRIOZOLA, JA [1 ]
机构
[1] UNIV SEVILLE,CSIC,CTR MIXTO,INST CIENCIA MAT SEVILLA,SEVILLE,SPAIN
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1993年 / 89卷 / 17期
关键词
D O I
10.1039/ft9938903307
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
In order to ascertain the role of formate ion in CO(x) methanation, the decomposition of adsorbed formate on a series of lanthanide-promoted Rh/Al2O3 catalysts (Ln = La, Ce, Sm, Yb, Lu) is reported. On the supports the decomposition occurs through a dehydration mechanism. The decomposition process is drastically modified on the rhodium catalysts, in these cases the decomposition proceeds mainly through a dehydrogenation reaction. Moreover, the decomposition temperature is decreased by 100 K with respect to the one observed on the supports alone. The presence of small amounts of gas-phase CO together with the appearance of adsorbed CO at the dehydrogenation temperatures leads us to propose that the HCOO- generated during CO(x) methanation cannot be considered as a non-reactive species. The CO seems to proceed from CO2 dissociation, its yield being a function of the metal dispersion which is determined by the promoter. The thermal stability of adsorbed CO is also determined by the promoter and is related to the activity of the catalyst in the CO(x) methanation.
引用
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页码:3307 / 3312
页数:6
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