Higher alcohol and oxygenate synthesis over Cs/Cu/ZnO/M sub 2 O sub 3 (M = Al, Cr) catalysts

Journal Article · Wed Mar 01 00:00:00 EST 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90087-0· OSTI ID:6464330

Nunan, J G; Herman, R G; Klier, K ^[1]

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1. 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), Vol. 116:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

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