The mechanism of methanol synthesis on copper/zinc oxide/alumina catalysts

摘要: This paper deals with the adsorption and temperature-programmed reaction spectroscopy of (i) formaldehyde on polycrystalline copper, zinc oxide (ii) methanol a copper/zinc oxide/alumina (60:30:10) catalyst. It shows that energetics formate hydrogenation/ hydrogenolysis copper component catalyst, which is rate-determining step in synthesis unaffected by intimate mixing The coverages individual components catalyst had been producing at rate 1.9 x 10−9 mol−1 s−1 g−1 from carbon dioxide/hydrogen feed (10% CO2, 1 bar, 500 K, 36 liters h−1) oxygen, hydrogen, species was determined monoxide titration temperatureprogrammed desorption. covered oxygen to between 3.5 1014 3.9 atoms cm−2 (i.e., 70 78% saturation). Coexisting this species, upper limit its coverage being 2.6 molecules cm−2. appeared be hydrided or contain interstitial hydrogen value greater than monolayer during Steady-state reaction.