A comparative study of methanol synthesis from CO[sub 2]/H[sub 2] and CO/H[sub 2] over a Cu/ZnO/Al[sub 2]O[sub 3] catalyst
- Pohang Univ. of Science and Technology (POSTECH), Pohang (Korea, Republic of) Research Institute of Industrial Science and Technology (RIST), Pohang (Korea, Republic of)
Methanol synthesis from CO[sub 2]/H[sub 2] and CO/H[sub 2] has been compared over a Cu/ZnO/Al[sub 2]O[sub 3] catalyst. Methanol synthesis was much faster with CO[sub 2]/H[sub 2] than with CO/H[sub 2], particularly at low temperatures. A trace amount of CO[sub 2] improved the rates significantly. Thus it appeared that CO[sub 2] was the primary source of methanol with CO/CO[sub 2]/H[sub 2] feed. When space velocities were varied, both the previously conflicting observations on the effect of CO[sub 2]/CO composition, i.e., monotonical increase in synthesis rate vs the presence of a maximum rate as CO[sub 2] concentration increased, were observed. The different conversion levels and consequent difference in surface oxygen coverage and/or water appeared to be responsible for the different effects. The more oxidized surface state of copper obtained for CO[sub 2]/H[sub 2] was more active and stable in methanol synthesis than the overreduced surface obtained for the CO/H[sub 2] feed. Due to the promotional and inhibition effects of water for CO/H[sub 2] and CO[sub 2]/H[sub 2] feeds, respectively, higher space velocities yielded higher synthesis rates for CO[sub 2]/H[sub 2] and the opposite effect was observed for the CO/H[sub 2]feed. 30 refs., 10 figs., 1 tab.
- OSTI ID:
- 5223887
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 144:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
100200 -- Synthetic Fuels-- Production-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
COPPER
ELEMENTS
HETEROGENEOUS CATALYSIS
HYDROGEN
HYDROXY COMPOUNDS
METALS
METHANOL
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SYNTHESIS
TRANSITION ELEMENTS
ZINC COMPOUNDS
ZINC OXIDES