Why does the presence of magnesium oxide species in catalysts favor cyclohexanol production over cyclohexane from guaiacol?

Label:chem

Topic
A research explores the impact of catalyst composition, specifically the inclusion of magnesium, on the selective hydrodeoxygenation of guaiacol. The presence of magnesium oxide species is noted to influence the properties of the catalysts and the final product distribution.
Answer
The magnesium oxide species in the catalysts lead to decreased reducibility and metallic area, and a reduction in the nickel content within the NiCu alloy. More importantly, their higher basicity inhibits the dehydration of cyclohexanol, which is a crucial step for forming cyclohexane. This results in catalysts prepared from hydrotalcites containing magnesium showing higher selectivity towards cyclohexanol (46-72%) compared to those without magnesium, which exhibit higher selectivity towards cyclohexane (48-65%).
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