SCHEDULED MAINTENANCE
Highly water-resistant carbon nanotube supported PdCl2–CuCl2 catalysts for low temperature CO oxidation†
Abstract
Carbon nanotube (CNT) supported PdCl2–CuCl2 catalysts were prepared by the two-step impregnation method, and the effects of the Pd and Cu loadings on their physicochemical properties and catalytic performance for low-temperature CO oxidation in the presence of high concentration moisture were investigated. With the increase in the Pd and Cu loadings, the surface active Pd2+ and Cu2+ species increased, improving the adsorption of CO and oxygen, and the oxidation of Pd0 to Pd2+ (or Pd+). Compared with Cu species, increasing the Pd loading can effectively add catalytically active sites for CO oxidation. For the CO oxidation, the presence of moderate water is necessary for sustaining the high activity of this catalyst, but the excessive water vapor in the feed gas would injure the activity and stability of the catalyst. When the moisture level in the reactant gas was 3.1%, the CO conversion was still retained at around 93% after 60 h of the reaction at 25 °C over the 3.3 wt% Pd–6.6 wt% Cu/CNT catalyst, indicating that this catalyst has very good stability and water-resistance.
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