A clear trend shows that as the concentration of metal (Cu 2+ + Zn 2+ ) ions increases, the (Cu + Zn)/Al molar ratio in the reconstructed samples gradually increases, reaching values of 0.86, 1.52, 1.82 and 1.84, for 20, 40, 60 and 80 mM, respectively.
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Hollow-SiO<sub>2</sub>@Cu <sub><i>x</i></sub> Zn <sub><i>y</i></sub> Mg <sub><i>z</i></sub> Al-LDHs as catalyst precursors for CO<sub>2</sub> hydrogenation to methanol.
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