Figure 10. Effect of water partial pressure (0.35 – 0.70 kPa)
and flow rate (1.54 – 3.07 x 10-6 mol
H2O s-1) on the CH3OH
and C2H4O selectivity over MIL-100(Cr)
as indicated by the molar flow rates detected for both products at the
reactor outlet as a function of time. (Extraction at 473 K, Reaction
conditions: 473 K, 2.9 kPa N2O, 1.5 kPa
CH4, 2 h, activated at 523 K in He for 12 h)
Scheme 2. (a) Representation of the MIL-100 surface following
the reaction of CH4 and N2O in which 1
mol methoxy is formed per mol CH4 reacted. (b) Formation
of acetaldehyde exclusively through the secondary reaction of
CH3OH molecules formed ’in-situ’ (blue) (c) Formation of
acetaldehyde exclusively by reaction with CH3OH fed at
the inlet (black), resulting in the formation of 1 acetaldehyde molecule
per methoxy consumed.