Methanol synthesis using H2, CO, and 18O-labeled CO2 was studied over a Cu-Zn oxide catalyst at 220 °C and 17 atm in a batch reactor. In the absence of gaseous water, the rate of production of C 18O was rapid. The rate of production of 18O-labeled methanol was about 50% of that of 16O-labeled methanol. The presence of gaseous water suppressed the production of [18O]methanol, but not C 18O or [16O]methanol. The results indicated that there are at least four parallel reactions on the catalyst: CO-CO2 exchange, CO hydrogenation, CO2 hydrogenation, and water-gas shift. Exchange of lattice oxygen with oxygen in CO2 also took place. There was no evidence for the production of methanol from the reaction of CO and water.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry