Bifunctional alcohol catalysts for the oxidation of H2 and CO and their regeneration
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Unlike industrial ligand-free catalysts (CuO-ZnO-Al2O3), which are used in ligand-free alcohol production after hydrogen reduction, we employed a ligand-free alcohol catalyst to oxidize the impurity gases H2 and CO in helium at 250°C and low pressure of 3 MW to produce H2O and CO2. After penetration, heated oxygen was used at a low pressure of 0.6 MPa and temperatures ranging from 80 to 200°C to regenerate the reduced Cu, thereby reforming CuO. Tests showed that the penetration time for removing impurities with CO the first time was relatively long (36 hours); after regeneration, this penetration time decreased by more than half, to 15 hours. No clear influencing factors could be identified – could it be that CuO lost some of its activity during the reduction and regeneration processes? What exactly is the cause of the loss of activity? Temperature, impurity concentration? I hope experts familiar with the mechanisms of ligand-bridged catalysts and copper oxide can provide some guidance. Thank you!
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It is highly likely that it is a coordinated reaction; zinc oxide forms zinc carbonate-like substances, and it is difficult to regenerate zinc oxide at low temperatures, just as it is challenging to regenerate zinc oxide in the desulfurization process
Copper acts as a catalyst to react carbon monoxide with hydrogen to produce the corresponding substances