Enhancement of Light Olefins Selectivity Over N-Doped Fischer-Tropsch Synthesis Catalyst Supported on Activated Carbon Pretreated with KMnO4

Abstract

Ammonium iron citrate was used as an iron precursor in order to prepare N-doped catalysts supported on KMnO4 pretreated activated carbon (10MnK-AC). Iron nitride was synthesized in company with the formation of α-Fe2O3 on 10MnK-AC. The characterizations of the catalysts show that nitrogen atoms were doped into iron lattice rather than the networks of the carbon support. The performance of Fischer-Tropsch synthesis to light olefins (FTO) suggest an improvement in O/P ratio (olefins to paraffins molar ratio of C2–C4) over the iron catalysts supported on 10MnK-AC. The further promotion of light olefins selectivity (up to 44.7%) was obtained over FeN-10MnK-AC catalyst owing to the collaborative contribution of the electron donor effect of nitrogen and the suppression effect on the second hydrogenation over 10MnK-AC support.

Experimental correlation of Mn3+cation defects and electrocatalytic activity of α-MnO2– an X-ray photoelectron spectroscopy study

“…92,93 Moreover, Ag 3d, 94–96 K 2s (ref. 97, 98 and 99) and K 2p partial photoemissions 100–102 can be observed in the survey spectra of the as-synthesized α-MnO 2 catalysts, which can be attributed to the incorporation of Ag and K, as has been discussed in the previous section. Fig.…”

Carbon-based catalysts for Fischer–Tropsch synthesis

“…The KMnO 4 pretreated AC (10MnK-AC) was used as support for preparing N-doped Fe catalysts by using ammonium iron citrate as an iron precursor. 156 The lower olefin selectivity of 10FeN-27Mn-5K/AC accounts for 44.7%. An improvement in O/P ratio was simultaneously observed.…”

Research Advances on Nitrogen-Doped Carbon Materials in COx Hydrogenation

“…Tian et al [90] utilized ammonium citrate ferrite to simultaneously load Fe and dope N into activated carbon. Raman spectroscopy revealed that the graphitization degree of the activated carbon remained unchanged before and after N doping, indicating that N entered the Fe lattice rather than the carbon material itself, thereby enhancing the electron transfer between the N and the Fe.…”