Higher alcohol and oxygenate synthesis over Cs/Cu/ZnO/M sub 2 O sub 3 (M = Al, Cr) catalysts
- Lehigh Univ., Bethlehem, PA (USA)
Surface doping of Cu/ZnO/M{sub 2}O{sub 3} (M = Al, Cr) catalysts prepared from hydrotalcite precursors with cesium (Cs/Cu/ZnO/M{sub 2}O{sub 3}) significantly enhanced to the alcohol synthesis rate under higher alcohol synthesis conditions. With respect to the unsupported Cs/Cu/ZnO catalyst, the product selectivity of the Cs/Cu/ZnO/Al{sub 2}O{sub 3} catalyst was shifted toward methanol, while the Cs/Cu/ZnO/Cr{sub 2}O{sub 3} catalyst maintained a high selectivity toward C{sub 2}{sup +} alcohols. The presence of cesium in the Cu/ZnO/M{sub 2}O{sub 3} catalysts inhibited the synthesis of dimethyl ether. Comparison of the product distributions obtained over the Cs/Cu/ZnO/M{sub 2}O{sub 3} catalysts with those observed over the Cs/Cu/ZnO catalysts indicates that the function of the Cs/Cu/ZnO/Cr{sub 2}O{sub 3} catalyst is similar to that of the Cs/Cu/ZnO in that higher alcohols are synthesized by a stepwise carbon chain growth via a unique aldol coupling with oxygen retention reversal mechanism. The Al{sub 2}O{sub 3}-based catalysts undergo complex structural changes that probably cause occlusion of the Cs dopant, thus resulting in low selectivity to higher alcohols while retaining high activity toward methanol. 23 refs.
- OSTI ID:
- 6464330
- Journal Information:
- Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 116:1; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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ALCOHOLS
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CESIUM
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COMPARATIVE EVALUATIONS
COPPER
DOPED MATERIALS
ELEMENTS
ETHANOL
ETHERS
HYDROXY COMPOUNDS
KINETICS
MATERIALS
METALS
METHANOL
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROMOTERS
REACTION INTERMEDIATES
REACTION KINETICS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZINC COMPOUNDS
ZINC OXIDES