catalysts Poisoning Effects of Alkali and Alkaline Earth Metal Doping on Selective Catalytic Reduction of NO with NH 3 over the Nb-Ce/Zr-PILC Catalysts

: The poisoning effects of alkali metals (K and Na) and alkaline earth metals (Ca and Mg) on catalytic performance of the 2Nb4Ce/Zr-PILC catalyst for the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR) were investigated, and physicochemical properties of the catalysts were char-acterized by means of the X-ray diffraction XRD (XRD), Brunner − Emmet − Teller (BET), hydrogen temperature-programmed reduction (H 2 -TPR), X-ray Photoelectron Spectroscopy (XPS), ammonia temperature-programmed desorption (NH 3 -TPD), and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) techniques. Doping of M (M = K, Na, Ca, and Mg) deactivated the 2Nb4Ce/Zr-PILC catalyst according to the sequence of 0.8 K > 0.8 Na > 0.8 Ca > 0.8 Mg (M/Ce molar ratio = 0.8). The characterization results showed that the decreases in redox ability, NH 3 adsorption, Ce 3+ /Ce 4+ atomic ratio, and amount of the chemisorbed oxygen (O β ) were the important factors influencing catalytic activities of the alkali metal-and alkaline earth metal-doped samples. Consequently, compared with the Mg- and Ca-doped samples, doping of K caused the 2Nb4Ce/Zr-PILC sample to possess the lowest redox ability, NH 3 adsorption, and amount of the O β species, which resulted in an obvious deactivation

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