Carbon-carbon bond formation pathways in CO hydrogenation to higher alcohols
Carbon-carbon bond formation pathways during CO hydrogenation to higher alcohols were studied on alkali-promoted Cu-based catalysts (K-CuMgCeO{sub x} and Cs-Cu/ZnO/Al{sub 2}O{sub 3}) using {sup 13}CO/H{sub 2}/{sup 12}CH{sub 3}OH reactants. C-C bonds in ethanol form via two pathways, direct reactions of {sup 13}CO and direct coupling of {sup 12}CH{sub 3}OH. On K-CU{sub 0.5}Mg{sub 5}CeO{sub x}, direct reactions of {sup 13}CO are the predominant pathway for the initial C-C bond steps. On Cs-Cu/ZnO/Al{sub 2}O{sub 3}, ethanol is predominantly formed via direct coupling of oxygen-containing C{sub 1} intermediates derived from {sup 12}CH{sub 3}OH. Ca{sup +} cations introduce a methanol-coupling pathway unavailable on catalysts without Cs{sup +} promoter, leading to higher alcohol synthesis rates. After ethanol formation, additional chain growth occurs via aldol-type coupling pathways using C{sub 1} intermediates derived from {sup 12}CH{sub 3}OH on both K-Cu{sub 0.5}Mg{sub 5}CeO{sub x} and Cs-Cu/ZnO/Al{sub 2}O{sub 3} catalysts.
- Research Organization:
- Univ. of California, Berkeley, CA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC22-94PC94066
- OSTI ID:
- 20003854
- Journal Information:
- Journal of Catalysis, Vol. 188, Issue 1; Other Information: PBD: 15 Nov 1999; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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