Abstract Catalytic dehydration of methanol to dimethyl ether (DME) was investigated using
physically and chemically modified H-Mordenite and H-Beta zeolites as catalysts. Physical modification
was carried out using ultrasonic wave’s energy, while chemical modification was performed
through impregnation in aluminum nitrate followed by calcination. The produced solid catalysts
were evaluated as selective catalysts for the dehydration of methanol to dimethyl ether at
100–250 C performed at three different contact times. Chemical and structural characterizations
of the solid catalysts were identified using XRD, FT-IR, TEM, SEM and NH3-TPD.
Ultrasonication physical mixing of solids proved as useful tool of preparation, producing fine
reordered crystals of nanocomposite zeolites with novel morphology. The newly ordered crystals
were distinguished by their frame work structure, acidic properties, crystal and particle sizes, unit
cell volume, pore opening, and favorable catalytic activity of 100% selectivity to DME at 200 C
for all contact times studied. The effects of Al2O3 on the dispersion and interaction within the
nano-zeolite crystals and hence on the catalytic dehydration of methanol were verified as the major
influence toward utmost selectivity.
Abstract Catalytic dehydration of methanol to dimethyl ether (DME) was investigated usingphysically and chemically modified H-Mordenite and H-Beta zeolites as catalysts. Physical modificationwas carried out using ultrasonic wave’s energy, while chemical modification was performedthrough impregnation in aluminum nitrate followed by calcination. The produced solid catalystswere evaluated as selective catalysts for the dehydration of methanol to dimethyl ether at100–250 C performed at three different contact times. Chemical and structural characterizationsof the solid catalysts were identified using XRD, FT-IR, TEM, SEM and NH3-TPD.Ultrasonication physical mixing of solids proved as useful tool of preparation, producing finereordered crystals of nanocomposite zeolites with novel morphology. The newly ordered crystalswere distinguished by their frame work structure, acidic properties, crystal and particle sizes, unitcell volume, pore opening, and favorable catalytic activity of 100% selectivity to DME at 200 Cfor all contact times studied. The effects of Al2O3 on the dispersion and interaction within thenano-zeolite crystals and hence on the catalytic dehydration of methanol were verified as the majorinfluence toward utmost selectivity.
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