| Summary: | Co-based catalyst has excellent chlorine resistance, so it is an effective catalyst to degrade VC at present. A series of high-performance CoxBa1 catalysts were prepared by doping Ba into Co3O4 and changing the Ba/Co mol ratio. Under the condition of space velocity of 15,000 ml·g−1·h−1, the conversion rate of VC reached 90% at 199 °C in Co19Ba1, the temperature is much lower than T90 of pure Co3O4 (309 °C), and the catalysis activity of Co19Ba1 was higher than that of the other alkali metal-doped Co19M1 (M = Sr, Ca). Ba species in CoxBa1 mainly exist in the form of BaCO3. With the addition of BaCO3, the particle size of CoxBa1 decreases, resulting in the increase of active site of CoxBa1. BaCO3 can also make CoxBa1 obtain better low-temperature reducibility and more active components. In addition, the increase of BaCO3 content will also increase the basic sites of CoxBa1, and more basic sites can effectively protect Co3O4 from Cl poisoning. When Ba/Co is 1/19, the content of BaCO3 is the highest, so Co19Ba1 also shows the best activity.
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