C2-C5+ olefin production from CO2 hydrogenation using ceria modified Fe/Mn/K catalysts

Selective formation of light olefins from CO2 hydrogenation over Fe–Zn–K catalysts

“…As the Zn content increased, the CO 2 conversion was slightly decreased because of the formation of unreducible ZnFe 2 O 4 in iron oxide precursors, which prevented the catalysts from activation and resulted in the activity fall during CO 2 hydrogenation [15]. The 1Fe-1Mn-K sample also showed good activity and olefin selectivity, however, the activity was lower than that of reported FeMnK catalyst with 50.4% CO 2 conversion [27], and the selectivity of C 2 ¼-C 4 ¼ was lower compared with that of the 1Fe-1Zn-K sample. Pre-reduction with H 2 on 1Fe-1Zn-K catalyst exhibited relatively higher activity and high C 5 + selectivity but low CH 4 selectivity in CO 2 hydrogenation, however, increased CH 4 selectivity and low C 2 ¼-C 4 ¼ selectivity were obtained with H 2 /CO 2 reduction.…”

“…A slight increase in the CO and CH 4 formation could be ascribed to the formation of ZnO, which promotes the activity for the RWGS reaction [19] and provides a large amount of activated hydrogen for subsequent hydrogenation of adsorbed reaction intermediates, and thus causes slight increase in the CH 4 selectivity [17]. However, zinc addition has almost no effect on light olefin selectivity, and the olefin/paraffin (O/P) above 6.0 for all the samples, was superior to those by ceria modified Fe/Mn/K catalysts with O/P ratio of 4.4 [27]. These data demonstrate that Fe-Zn-K catalysts have excellent properties toward CO 2 hydrogenation to light olefins.…”

Sustainable technologies for the reclamation of greenhouse gas CO2

“…Many previous works have shown that CO is an intermediate to long chain HC formation in CO 2 hydrogenation, though there are many surmises about the synthesis of light alkanes from CO 2 . Dorner investigated the effect of the addition of ceria to a Fe/ MneAl 2 O 3 catalyst on a CO 2 hydrogenation (Dorner et al, 2011), finding that the addition of low levels of Ce leaded to a marginal improvement in the catalyst's CO 2 hydrogenation ability. Upon heavier doping, CO 2 conversion was lower than with the undoped catalyst, and the product distribution was shifted away from C 2 eC 5þ HC and towards CO.…”

Promoter Effects on Iron–Silica Fischer–Tropsch Nanocatalysts: Conversion of Carbon Dioxide to Lower Olefins and Hydrocarbons at Atmospheric Pressure

“…[13] So far, many of the schemes for renewable If CO 2 hydrogenation is to become a viable process for the utilisation of CO 2 , improved catalysts are urgently needed. We report the promotional effects of Group 11 and 13 metals on the performance of iron-silica catalyst systems under atmospheric pressure.…”