期刊
TOPICS IN CATALYSIS
卷 46, 期 1-2, 页码 87-92出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-007-0318-4
关键词
zirconia/tungstated; promotion; chromia; platinum; n-alkane; isomerization; tungsten bronze; hydrogen effect
Tungstated zirconia (WZ) and WZ promoted by platinum (PtWZ) were tested for their catalytic performance in the isomerization of n-pentane to isopentane. It was shown that the additional promotion by a transition metal oxide, namely iron oxide (PtFeWZ) or chromium oxide (PtCrWZ) led to significant improvements of activity, selectivity and stability of the catalysts. The chromium-promoted material PtCrWZ was shown to be the most promising catalyst giving yields close to the thermodynamic equilibrium value at given reaction temperatures and selectivities to i-C-5 close to and greater than 99%. The high activity of the Cr-promoted catalyst permits operation at low reaction temperatures (< 200 degrees C), i.e., under thermodynamically favorable reaction conditions. The oxidation state of the chromium is 3+ or lower, and is therefore environmentally benign.
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