Hydrogenation of carbon dioxide over alumina supported Fe-K catalysts

Fischer–Tropsch Synthesis by Carbon Dioxide Hydrogenation on Fe-Based Catalysts

“…K addition remarkably enhanced CO conversion, as observed previously [13]. However, the reaction test for 160 h showed that too high K promotion (K/Fe [ 0.08) led to the gradual deactivation of the catalysts, due to carbon formation.…”

“…The catalyst prepared by adding Al 2 O 3 during co-precipitation, increased the CO 2 uptake (425 lmol/g). In the case of promoted iron catalysts, it was observed that H 2 chemisorbed only on Fe, whereas CO 2 chemisorbed on both Fe and K. Al 2 O 3 increased the dispersion of Fe whereas SiO 2 decreased it, the later due to poor contact between Fe and K as also reported in the literature [13]. The TPR profile of the co-precipitated Fe-Cu-Al-K catalyst also showed sharper peak for the reduction of Fe indicating better exposure of the metal.…”

“…Hydrogenation of CO 2 was carried out on Al 2 O 3 -supported Fe-K catalysts [13]. With a constant iron loading, the K/Fe molar ratio was varied in the range 0-1.0.…”

Effect of acid-base properties on copper catalysts for hydrogenation of carbon dioxide

“…Basic nature, however, increases the stability of the formate species for hydrogenation, which results in the decrease of methanol selectivity. Choi et al have also reported that addition of K increases CO2 chemisorption and enhances the activity for CO formation [10].…”

The kinetic study of light alkene syntheses by CO2 hydrogenation over Fe-Ni catalysts

“…In recent years, there have been a significant progress on the CO 2 hydrogenation to hydrocarbons owing to the increasing interest in CO 2 utilization [4][5][6][7]. The synthesis of light alkenes as well as methane and light alkanes by CO 2 hydrogenation over Fe/ Al 2 O 3 with the addition of kalium have been investigated, and the experimental results show that the selectivity of Fe/ Al 2 O 3 catalyst toward light alkenes increases with the addition of kalium.…”