Promoter effect of cesium on C-C bond formation during alcohol synthesis from CO/H{sub 2} over Cu/ZnO/Cr{sub 2}O{sub 3} catalysts
- Instituto de Catalisis y Petroleoquimica, Madrid (Spain)
- Ciudad Universitaria, Madrid (Spain)
- Lehigh Univ., Bethlehem, PA (United States)
The effect of calcination temperature and Cs-promotion on the ternary Cu-Zn-Cr oxide catalyst has been investigated in connection with both structural and catalytic properties in the high pressure CO hydrogenation. As revealed by TPR and XPS, the reduction of copper is inhibited by incorporation of Cs promoter. Under typical reaction conditions, detectable copper phases are reduced to metallic copper. The crystal size of copper particles tends to increase with increasing reduction temperature and simultaneously Cs is segregated to the catalyst surface. Activity results in CO hydrogenation, with and without cofeeding methanol, ethanol, or 1-propanol, showed that methanol of C{sub 2+}OH yield increased upon Cs-doping of the catalysts. By feeding a given C{sub n}OH alcohol, the C{sub n+}OH yield was enhanced, with the most difficult chain growth being for the reaction CH{sub 3}OH{r_arrow}CH{sub 3}CH{sub 2}OH. While a large surface area of the catalysts, with ill-defined crystalline phases, is the key parameter for an enhancement in the productivity and a low increase in the selectivity to higher alcohols, cesium incorporation leads to substantial improvement in C{sub 2+} OH selectivity. 51 refs., 8 figs., 6 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 501852
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 163; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10 SYNTHETIC FUELS
40 CHEMISTRY
ALCOHOLS
CARBON MONOXIDE
CATALYSTS
CATALYTIC EFFECTS
CESIUM
CHEMICAL PREPARATION
CHEMICAL REACTION YIELD
CHROMIUM OXIDES
COPPER
CRYSTAL DOPING
HETEROGENEOUS CATALYSIS
HYDROGENATION
PHOTOELECTRON SPECTROSCOPY
REDUCTION
TEMPERATURE DEPENDENCE
ZINC OXIDES