Mg and Cu incorporated CoFe2O4 catalyst: characterization and methane cracking performance for hydrogen and nano-carbon production

Facile modification of cobalt ferrite by SiO 2 and H‐ZSM‐5 support for hydrogen and filamentous carbon production from methane decomposition

“…Figure 6 also imply that CoFe 2 O 4 /H‐ZSM‐5 catalyst did not shows deactivation sign after running 300 min, while the CoFe 2 O 4 /SiO 2 catalyst showed a rapid deactivation behavior after 30 min of TOS. The methane conversion percentage and hydrogen formation rate using unsupported CoFe 2 O 4 under same experimental conditions was 31.61% and 66.50 mol H 2 g −1 min −1 , respectively 39 . Suggesting that the use of H‐ZSM‐5 support for CoFe 2 O 4 improved its catalytic activity, while the SiO 2 support of cobalt ferrite led to a significant decrease in its catalytic activity.…”

“…The Raman spectrum of CoFe 2 O 4 /H‐ZSM‐5 is a typical feature of inverse‐mixed spinel's 51 . Further, the Raman mode A 1 1g of CoFe 2 O 4 /SiO 2 shifts to higher wavenumber in compare to that of CoFe 2 O 4 /H‐ZSM‐5 and that of unsupported CoFe 2 O 4 as well 39 . The mode A 1 1g is assigned to the oxygen‐iron ions bond in the tetrahedral sites, while, mode T 2 2g is related to the oxygen‐metal (Fe–O and Co–O) bond in octahedral sites of the spinel structure.…”

“…Figure 2A,B shows the nitrogen adsorption/desorption isotherms and the pore size distribution curves of CoFe 2 O 4 /SiO 2 and CoFe 2 O 4 /H‐ZSM‐5 catalysts at temperature of 77.4 K. As seen in Figure 2A, the CoFe 2 O 4 /SiO 2 catalyst exhibit type III isotherm with H3 hysteresis loop, characterize aggregates of plate like particles forming slit‐like pores, and indicating strong adsorbate‐adsorbate (multilayers) interaction 39,44,45 . Meanwhile, CoFe 2 O 4 /H‐ZSM‐5 catalyst reveals type V isotherm with H2 characteristics hysteresis loop, implying relatively uniform channel‐like pores.…”

“…X‐ray diffractometer (XRD) patterns of (A) SiO 2 and H‐ZSM‐5 support and (B) CoFe 2 O 4 /SiO 2 and CoFe 2 O 4 /H‐ZSM‐5 catalyst, the XRD patterns of pure CoFe 2 O 4 was taken from elsewhere 39 …”

“…The bands like humps in CoFe 2 O 4 /SiO 2 sample as well as peak shift can be related a high defectively and low crystallinity (SiO 2 ‐rich) as confirmed by XRD (Figure 3). The mode A 2 1g is due to partial cation redistribution and disorder effects of Fe 3+ and Co 2+ over the octahedral and tetrahedral sites 39 …”