There is an hydrogenation reaction happening in between Fatty Acid Wax Esters and Hydrogen gas at a temperature of 200 degC and pressure of 240 barg to produce Fatty Alcohol. The lab analysis of Fatty Alcohol shows the presence of aldehyde and methyl esters. I know how aldehyde are formed but unaware of methyl esters forming.

I believe the C–C bonds is breaking as a side reaction and thus forming methyl ester. Can anyone tell if that is really possible?

PS: There is no methanol or ethanol used anywhere .