Figure 3

XRD patterns of the dried precursors (A) and the calcined catalysts (B). (A): (a') MgO-P-NaOH-3-Pre, (b') MgO-P-NaOH-6-Pre, (c') MgO-P-NaOH + Na₂CO₃-3/1-Pre, (d') MgO-P-NaOH + Na₂CO₃-1/3-Pre, (e') MgO-P-Na₂CO₃-3-Pre, and (f') MgO-P-Na₂CO₃-3.14-Pre. (B): (a) MgO-P-NaOH-3, (b) MgO-P-NaOH-6, (c) MgO-P-NaOH + Na₂CO₃-3/1, (d) MgO-P-NaOH + Na₂CO₃-1/3, (e) MgO-P-Na₂CO₃-3, and (f) MgO-P-Na₂CO₃-3.14.