Table 1. Molar ratios of Cu, Mg, Al, and CO₃ in different Cu²⁺-modified Mg–Al samples.

Sample	Molar ratio of elements Cu : Mg : Al : CO3
H (H500)	0 : 0.07 : 0.03 : 0.015 (0 : 7:3 : 1.5)
2-CuH (2-CuH500)	0.02 : 0.05 : 0.03 : 0.015 (2 : 5:3 : 1.5)
3-CuH (3-CuH500)	0.03 : 0.04 : 0.03 : 0.015 (3 : 4:3 : 1.5)
4-CuH (4-CuH500)	0.04 : 0.03 : 0.03 : 0.015 (4 : 3:3 : 1.5)
5-CuH (5-CuH500)	0.05 : 0.02 : 0.03 : 0.015 (5 : 2:3 : 1.5)
6-CuH (6-CuH500)	0.06 : 0.01 : 0.03 : 0.015 (6 : 1:3 : 1.5)