The syngas from gasification mainly contains carbon monoxide
(CO) and hydrogen (H2). Overall DME synthesis reactions consist
of 3-step reactions: methanol synthesis, dehydration and water gas
shift (WGS) reaction as following reactions. The formation of methanol is considered by two reaction mechanisms as illustrated in both
reaction (1) and (2); reaction (1) is the formation of methanol participating CO and H2 as major reactants. This reaction emits high
reaction enthalpy. While reaction (2) is led to by participating CO2
and H
2, it has less reaction enthalpy than reaction (1). It is assumed
that both reactions can proceed to produce methanol simultaneously
in this study
Methanol passes through the following dehydration reaction with
DME synthesis catalyst as in reaction (3). DME catalyst is used to
Cu/ZnO/Al
2O3+γ-Al2O3 in this process. Reaction (4) is shown as a
WGS reaction, and it has a role to supply CO2 and H2 for DME synthesis.
Methanol passes through the following dehydration reaction with
DME synthesis catalyst as in reaction (3). DME catalyst is used to
Cu/ZnO/Al
2O3+γ-Al2O3 in this process. Reaction (4) is shown as a
WGS reaction, and it has a role to supply CO2 and H2 for DME synthesis.