A Comparative Study of the Effect of MgO and CaCO₃ as Support Materials in the Synthesis of Carbon Nanotubes with Fe/Co as Catalyst

Table 1

Quantitative analysis of elements and atoms obtained from energy dispersive spectroscopy of Fe/Co catalyst supported on magnesium oxide and calcium carbonate.

Element	Fe/Co/MgO			Fe/Co/CaCO3
	Element (% weight)	Atom (%)	Peak height (au)	Element (% weight)	Atom (%)	Peak height (au)
Carbon (C)	27.11	33.20	30326	27.15	33.25	25528
Oxygen (O)	72.46	66.61	1598	72.49	66.64	626
Magnesium (Mg)	0.22	0.13	892	—	—	—
Calcium	—	—	—	0.17	0.06	296
Iron	0.14	0.04	312	0.09	0.02	261
Cobalt	0.07	0.02	312	0.10	0.03	261
Total	100	100		100	100