A kinetic study of methanol synthesis in a slurry reactor using a CuO/ZnO/Al2O3 catalyst
- Texas A & M Univ., College Station, TX (United States)
A kinetic model that describes the methanol production rate over a CuO/ZnO/AI203 catalyst (United Catalyst L-951) at typical industrial operating conditions is developed using a slurry reactor. Different experiments are conducted in which the H2/(CO+CO2) ratio is equal to 2, 1, and 0.5, respectively, while the CO/CO2 ratio is held constant at 9. At each H2/(CO+CO2) ratio the space velocity is set at four different values in the range of 3000-13,000 1/hr kgcat. The effect of H2/(CO+CO2) ratio and space velocity on methanol production rate, conversions, and product composition is further investigated. The results indicate that the highest methanol production rate can be achieved at H2/(CO+CO2) ratio of 1 followed by H2/(CO+CO2) ratio of 0.5 and 2 respectively. The hydrogen and carbon monoxide conversions decrease with increasing space velocity for all H2/(CO+CO2) ratios tested. Carbon monoxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 0.5 and 2. On the other hand, carbon dioxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 1. At all H2/(CO+CO2) ratios, the extent of the reverse water gas shift reaction decreases with increasing space velocity. The effect of temperature on the kinetics is examined by using the same experimental approach at 508 K. It is found that a different reaction sequence takes place at each temperature. Also, a time on stream study is conducted simultaneously in order to investigate the characteristic of catalyst deactivation with time on stream. During the first 150 hours of time on stream, the catalyst loses approximately 2/3 of its initial activity before reaching a steady state activity.
- Research Organization:
- Texas A & M Univ., College Station, TX (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG22-89PC89787
- OSTI ID:
- 10159747
- Report Number(s):
- DOE/PC/89787-T4; ON: DE92016818
- Resource Relation:
- Other Information: TH: Thesis (M.S.); PBD: May 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10 SYNTHETIC FUELS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
METHANOL
SYNTHESIS
CARBON MONOXIDE
HYDROGENATION
CARBON DIOXIDE
COPPER OXIDES
CATALYTIC EFFECTS
ZINC OXIDES
ALUMINIUM OXIDES
HYDROGEN
QUANTITY RATIO
TEMPERATURE EFFECTS
TEMPERATURE RANGE 0400-1000 K
CATALYSTS
DEACTIVATION
EXPERIMENTAL DATA
CHEMICAL REACTORS
010408
100200
400201
C1 PROCESSES
PRODUCTION
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES