USE OF CATALYTIC REACTIONS TO PROBE MG-AL MIXED-OXIDE SURFACES

被引:26
作者
FISHEL, CT [1 ]
DAVIS, RJ [1 ]
机构
[1] UNIV VIRGINIA,DEPT CHEM ENGN,CHARLOTTESVILLE,VA 22903
关键词
MAGNESIA; ALUMINA; HYDROTALCITE; MIXED OXIDES; 2-PROPANOL DEHYDRATION AND DEHYDROGENATION; BUTENE ISOMERIZATION;
D O I
10.1007/BF00815418
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 this work, we investigated the effect of catalyst composition on the surface reactivity of magnesium-aluminum mixed oxides using three probe reactions: dehydrogenation of 2-propanol to propanone, dehydration of 2-propanol to propene, and isomerization of 1-butene. Turnover rates were calculated from the total CO2 adsorption capacity of the mixed oxides, assuming one adsorption site corresponds to one active site. Turnover rates for the dehydrogenation of 2-propanol were independent of the catalyst composition, which is consistent with the structure insensitivity of dehydrogenation reactions. The other two probe reactions followed opposite trends with the Mg: Al ratio: as the Al content of the mixed oxides increased, the turnover rate for 2-propanol dehydration increased while that for 1-butene isomerization decreased. The magnitude of these changes confirms that the mixed oxides are truly interdispersed and not present as separate phases.
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页码:87 / 95
页数:9
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