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Surface and catalytic properties of Fe2O3Cr2O3/Al2O3 solids as being influenced by Li2O and K2O-doping by Gehan A Fagal; Gamil A El-Shobaky; Sahar M El-Khouly is a Materials Science article available to read on EtoBox.

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The effects of Li 2 O (0.15-0.60 wt.%) and K 2 O (0.45 -1.80 wt%)-doping on surface and catalytic properties of Fe 2 O 3 Cr 2 O 3 /Al 2 O 3 solids were studied using nitrogen adsorption at -196°C and oxidation of CO by O 2 at 225-300°C. The results showed that Li 2 O (0.6%) and K 2 O (1.8%) doping followed by precalcination at 700°C resulted in an important increase in the BET-surface areas (about one-fold) of the treated solids. The precalcination of variously doped solids at 400°C exerted no significant change in the specific surface areas of the doped adsorbents. The catalytic activity increased by increasing the amount of Li 2 O added to the solids preheated at 400 and 700°C. On the other hand, K 2 O-doping conducted at 400°C, which resulted in a considerable increase in the catalytic activity of the treated solids, much decreased their catalytic activity upon precalcination at 700°C. The doping process did not modify the mechanism of catalytic oxidation of CO by O 2 , but changed the concentration of catalytically-active component (surface Fe 2 O 3 crystallites) without modifying their energetic nature.

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Author

Gehan A Fagal; Gamil A El-Shobaky; Sahar M El-Khouly

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7757)

Published

2001

Language

EN

Field

Materials Science (Physical Sciences)