Gesellschaft Deutscher Chemiker
Keine Benachrichtigungen
Sie haben noch keine Lesezeichen


Operando DRIFT and In situ Raman Spectroscopic Studies on Aspects of CO2 Fischer‐Tropsch Synthesis Catalyzed by Bulk Iron Oxide‐Based Catalysts

Von Wiley-VCH zur Verfügung gestellt

Hematite is a suitable precursor to obtain catalytically active iron (oxide) phases for CO 2 Fischer-Tropsch synthesis after a reductive pretreatment. As concluded from in situ Raman spectroscopy, in hydrogen atmosphere the transformation from a-Fe 2 O 3 to Fe 3 O 4 is faster than the further reduction from Fe 3 O 4 to Fe (metallic iron). The rate of these steps highly depends on the temperature. Starting from pure hematite, surface formate species are formed at a CO 2 /H 2 gas mixture at elevated temperatures, observable by DRIFT-spectroscopy. The exposure to CO 2 and CO led to surface carbonate-carboxylate surface species. Reduced samples with varying contents of Fe 3 O 4 and Fe did not show any observable adsorbates at reaction conditions. The same behaviour was found during the dosage of the single gases CO 2 and CO to these reduced catalysts. The formation of carbonaceous species, detected by Raman spectroscopy, could indirectly hint to the occurrence of carbidation and was especially observed for a good performing catalyst with a medium reduction degree.

Zum Volltext

Überprüfung Ihres Anmeldestatus ...

Wenn Sie ein registrierter Benutzer sind, zeigen wir in Kürze den vollständigen Artikel.