Carbon Dioxide Reduction with Hydrogen on Fe, Co Supported Alumina and Carbon Catalysts under Supercritical Conditions

Molecules

AlexanderL. Kustov¹  ViktorI. Bogdan¹  AlekseyE. Koklin¹  LeonidM. Kustov¹  YanaA. Pokusaeva¹  TatianaV. Bogdan¹ 

[1] N.D. Zelinsky Institute of Organic Chemistry, Leninsky Prospect, 47, 119991 Moscow, Russia;

关键词: carbon dioxide;    carbon monoxide;    methane;    supercritical CO₂;    iron nanoparticles;    cobalt nanoparticles;   

DOI  :  10.3390/molecules26102883

来源: DOAJ

【 摘 要 】

Reduction of CO₂ with hydrogen into CO was studied for the first time on alumina-supported Co and Fe catalysts under supercritical conditions with the goal to produce either CO or CH₄ as the target products. The extremely high selectivity towards methanation close to 100% was found for the Co/Al₂O₃ catalyst, whereas the Fe/Al₂O₃ system demonstrates a predominance of hydrogenation to CO with noticeable formation of ethane (up to 15%). The space–time yield can be increased by an order of magnitude by using the supercritical conditions as compared to the gas-phase reactions. Differences in the crystallographic phase features of Fe-containing catalysts cause the reverse water gas shift reaction to form carbon monoxide, whereas the reduced iron phases initiate the Fischer–Tropsch reaction to produce a mixture of hydrocarbons. Direct methanation occurs selectively on Co catalysts. No methanol formation was observed on the studied Fe- and Co-containing catalysts.

【 授权许可】

Unknown