High C2-C4 selectivity in CO2 hydrogenation by particle size control of Co-Fe alloy nanoparticles wrapped on N-doped graphitic carbon

Promotional Effects on the Catalytic Activity of Co-Fe Alloy Supported on Graphitic Carbon for CO2 Hydrogenation

“…The series of Co-Fe@(N)C and Co-Fe@C catalysts modified with the promoters under study are listed in Table 1, which also includes the relevant analytical data for these samples. Samples 1, 3, and 5 have been previously reported by us in previous studies [12,14]. The other samples appearing in Table 1 serve to determine the influence of promoters (Pd, Ce, Ca) or poison (S) on their activity and selectivity.…”

“…The other samples appearing in Table 1 serve to determine the influence of promoters (Pd, Ce, Ca) or poison (S) on their activity and selectivity. The reader is referred to the published literature for a more extensive characterization of samples 1, 3, and 5 [12][13][14]. These materials were prepared following three different routes.…”

“…Then, Co 2+ and Fe 2+ salts were adsorbed onto chitosan beads in EtOH, before chemical reduction with NaBH 4 and subsequent supercritical CO 2 drying, followed by pyrolysis. It has been previously observed that NaBH 4 reduction of Co 2+ and Fe 2+ adsorbed on chitosan renders after the pyrolysis of Co-Fe alloy NPs of narrow particle distribution, in which the average particle dimension can be controlled to a certain extent in the range from 8 to 17 nm [14].…”

“…Within the context of decreasing CO 2 emissions into the atmosphere and the valorization of this gas as feedstock, there is an increasing interest in developing efficient catalysts for CO 2 hydrogenation to hydrocarbons [1][2][3][4][5][6][7][8][9][10][11]. In a series of papers, we have been reporting that Co-Fe alloy nanoparticles (NPs) wrapped onto defective N-doped graphene [Co-Fe@(N)C] are suitable catalysts that, by fine-tuning, can exhibit selectivity toward the formation of methane [12], the reverse water gas shift [13], or the formation of a significant percentage of C 2+ products [14]. It seems that, in these types of catalysts, particle size is one key parameter that determines product selectivity.…”

Effect of Ca on Perovskite La1−xCaxNiO3 Catalyst for CO2 Hydrogenation‐to‐Light Hydrocarbons in a Dielectric Barrier Discharge Plasma Reactor

“…Another issue to be considered is that linear CO 2 molecules have high thermodynamic stability, uniform charge distribution, zero polarization, and high ionization potential and generally require high temperature to realize the catalytic process with CO 2 activation as the first step. [27] Currently, the carbon dioxide conversion technologies that have been developed are thermal decomposition, [28] photocatalysis, [29,30] and electrochemical [31] methods. However, the conversion efficiency of photocatalysis and thermal catalysis is very low, and the cost of high temperature electrolysis is high.…”