Mechanisms of methanol synthesis from carbon dioxide and from carbon monoxide at atmospheric pressure over Cu/ZnO
- Hokkaido Univ., Sapporo (Japan); and others
Methanol synthesis from CO{sub 2} and CO was carried out at atmospheric pressure over a Cu/ZnO catalyst (Cu/Zn = 3/7) and the surface species formed were analyzed by diffuse reflectance FT-IR spectroscopy and temperature programmed desorption. It was revealed that CH{sub 3}OH and CO were produced from CO{sub 2}H{sub 2} through parallel pathways. Two types of formate species, HCOO-Cu and HCOO-Cu and HCOO-Zn, and zinc methoxide were formed in the course of methanol synthesis from CO{sub 2}. HCOO-Cu and HCOO-Zn were hydrogenated to methoxide. A comparison of the rates of hydrogenation with that of methanol synthesis from CO{sub 2} suggested that methanol synthesis from CO{sub 2} occurred via the hydrogenation of HCOO-Cu. The methanol synthesis from CO proceeded at a rate much slower than that from CO{sub 2}. HCOO-Zn and zinc methoxide were formed in the course of the CO-H2 reaction. No HCOO-Cu was detected. The amount of the zinc methoxide formed in the CO-H, reaction greatly exceeded that formed in the CO{sub 2}-H{sub 2} reaction. The rate of the formation of methoxide in the CO-H{sub 2} reaction was in reasonable agreement with that of the hydrogenation of HCOO-Zn. On the basis of these findings, the difference in the mechanisms of methanol synthesis from CO{sub 2} and from CO was discussed. 40 refs., 18 figs., 1 tab.
- OSTI ID:
- 224011
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 157; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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