Effect of potassium on CO hydrogenation to isobutanol over Cu/Zn/La/ZrO2 catalyst
The alkaline promoter K modified Cu/Zn/La/ZrO2 catalysts were prepared using the coprecipitation method, and used for the synthesis of isobutanol from syngas in a fixed bed reactor.The effects of K promoter and reaction temperature on the catalytic performance were investigated in combination of BET, XRD, CO2-TPD, NH3-TPD and CO-TPD characterizations.The results indicated that addition of K inhibited the dispersion of each component, leading to the larger particle size.Meanwhile, reduction peaks of CuO shifted to the higher temperature.However, addition of K led to an increase in the amount of weak acidic sites and weak base sites, whichhave remarkably close relationships with CO adsorption and space-time yield (STY) of alcohol.Moderate weak acid and base sites were beneficial to improve the STY of total alcohols and the selectivity of isobutanol in total alcohols.
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