Abstract Direct conversion of CO 2 toward isomerized heavy olefins remains a challenge. In this work, Fischer‐Tropsch synthesis and light olefins oligomerization were coupled to produce isomerized heavy olefins from CO 2 hydrogenation on a bifunctional K/Fe 2 N‐ x M/ASA catalyst. A K/Fe 2 N‐17.0%Ga/ASA achieved the highest selectivity (47.7%) toward C 4+ heavy olefins, among which the selectivity of isomerized olefins was as high as 32.2%. Ga species did not adsorb light olefins (e.g., ethylene) directly, but they boosted the adsorption of light olefins on ASA support. Besides, the addition of Ga promoted H 2 dissociation to generate Ga‐H species, which further transferred onto ASA support to form additional Brønsted acid sites promoting oligomerization reaction that obeyed β‐H elimination mechanism via alkoxide intermediates. This work developed not only a unique K/Fe 2 N as Fischer‐Tropsch synthesis catalyst, but also an integrated system coupling Fischer‐Tropsch synthesis and light olefins oligomerization to achieve high selectivity isomerized heavy olefins synthesis from CO 2 hydrogenation.
Liao et al. (Tue,) studied this question.