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Title: A kinetic study of methanol synthesis in a slurry reactor using a CuO/ZnO/Al sub 2 O sub 3 catalyst

A kinetic study of methanol synthesis in a slurry reactor using a CuO/ZnO/Al sub 2 O sub 3 catalyst A kinetic model that describes the methanol production rate over a CuO/ZnO/AI{sub 2}0{sub 3} catalyst (United Catalyst L-951) at typical industrial operating conditions is developed using a slurry reactor. Different experiments are conducted in which the H{sub 2}/(CO+CO{sub 2}) ratio is equal to 2, 1, and 0.5, respectively, while the CO/CO{sub 2} ratio is held constant at 9. At each H{sub 2}/(CO+CO{sub 2}) ratio the space velocity is set at four different values in the range of 3000-13,000 1/hr kg{sub cat}. The effect of H{sub 2}/(CO+CO{sub 2}) 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 H{sub 2}/(CO+CO{sub 2}) ratio of 1 followed by H{sub 2}/(CO+CO{sub 2}) ratio of 0.5 and 2 respectively. The hydrogen and carbon monoxide conversions decrease with increasing space velocity for all H{sub 2}/(CO+CO{sub 2}) ratios tested. Carbon monoxide hydrogenation appears to be the main route to methanol at H{sub 2}/(CO+CO{sub 2}) ratio of 0.5 and 2. On the other hand, carbon dioxide hydrogenation appears to be the main route to methanol at H{sub 2}/(CO+CO{sub 2}) ratio of 1. At all H{sub 2}/(CO+CO{sub 2}) ratios, the extent more » 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. « less
Authors:
Publication Date:
OSTI Identifier:7046137
Report Number(s):DOE/PC/89787-T4
ON: DE92016818
DOE Contract Number:FG22-89PC89787
Resource Type:Technical Report
Resource Relation:Other Information: Thesis (M.S.)
Research Org:Texas A and M Univ., College Station, TX (United States)
Sponsoring Org:DOE; USDOE, Washington, DC (United States)
Country of Publication:United States
Language:English
Subject: 01 COAL, LIGNITE, AND PEAT; 10 SYNTHETIC FUELS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINIUM OXIDES; CATALYTIC EFFECTS; CARBON DIOXIDE; HYDROGENATION; CARBON MONOXIDE; COPPER OXIDES; METHANOL; SYNTHESIS; ZINC OXIDES; CATALYSTS; CHEMICAL REACTORS; DEACTIVATION; EXPERIMENTAL DATA; HYDROGEN; QUANTITY RATIO; TEMPERATURE EFFECTS; TEMPERATURE RANGE 0400-1000 K; ALCOHOLS; ALUMINIUM COMPOUNDS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; COPPER COMPOUNDS; DATA; ELEMENTS; HYDROXY COMPOUNDS; INFORMATION; NONMETALS; NUMERICAL DATA; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; ZINC COMPOUNDS 010408* -- Coal, Lignite, & Peat-- C1 Processes-- (1987-); 100200 -- Synthetic Fuels-- Production-- (1990-); 400201 -- Chemical & Physicochemical Properties