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• W2022384484 abstract "The kinetics of CH3OH decomposition over ZnO was studied in the temperature ranges 453–513 K and 563–613 K. In the first range, CH3OH decomposed to H2 and CH2O, while in the second range CH3OH decomposed to CH2O, CO, CO2, and H2 with the CO and CO2 probably formed through formaldehyde or formate intermediates. The initial rate of production of hydrogen, RH2, depended on the methanol pressure Pm according to (PmRH2)12 = a + bPm; the initial rate of production of carbon monoxide plus carbon dioxide, Rc, depended on Pm according to (PmRc)13 = c + dPm. Both RH2 and Rc were independent of hydrogen, carbon monoxide, and carbon dioxide pressures over the temperature and pressure ranges studied. At 500 K and a given pressure, CH3OH decomposed more rapidly than CH2O. In both the low- and high-temperature ranges the decomposition of CH3OH, CH3OD, and CD3OD follow RCH3OH = RCH3OD > RCD3OD. A mechanism accounting for these findings is presented. Principal features are CH3O∗ + H∗ → H2 + CH2O∗ followed by either CH2O∗ → CH2O(g) + ∗ (the only step observed at low temperature) or CH2O∗ + ∗ → CHO∗ + H∗ → CO + H2. The fraction of formaldehyde decomposing increases with T and is about 20% at 593 K." @default.
• W2022384484 created "2016-06-24" @default.
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• W2022384484 date "1984-06-01" @default.
• W2022384484 modified "2023-09-27" @default.
• W2022384484 title "Kinetics and mechanism of methanol decomposition over zinc oxide" @default.
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• W2022384484 doi "https://doi.org/10.1016/0021-9517(84)90191-x" @default.
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