Applied Catalysis A: General, Vol.579, 44-51, 2019
Rare earth modified kaolin-based Cr2O3 catalysts for catalytic combustion of chlorobenzene
In this paper, a kaolin-based NaY-type zeolite crystal (KL-NY) material with large specific surface area and pore volume was prepared through in-situ crystallization, and then used as support to synthesize a series of rare earth elements (REE) modified Cr2O3 catalysts. The catalysts were systematically characterized and analyzed by XRD, N-2 adsorption, HRTEM-EDS-MAPPING, XPS, TPO, H-2-TPR, TPD and TPSR techniques. The structure-performance relationship of texture-structure of the catalysts, thermal stability and dispersion of active metals, and the performance for catalytic combustion of chlorobenzene (CB) were established. The results showed that there existed interaction between REE and Cr2O3, which induced the production of a certain amount of Cr6+ species on the catalyst surface that could enhance the catalytic performance of the catalysts. Among them, 10% CrNd (6:1)/KL-NY exhibited the highest catalytic activity and completely degrade CB at about 280 degrees C. Furthermore, 10%CrNd(6:1)/KL-NY represented high durability and good water-resistance for CB combustion during the long-term continuous test, indicating this catalyst deserved more attention and had great potential in industrial applications.