Promoting effect of potassium and calcium additives to cerium–zirconium oxide catalysts for the complete oxidation of carbon monoxide

Template Synthesis of Porous Ceria-Based Catalysts for Environmental Application

“…According to this work, not dopants but the unique pore structure and the uniform distribution of active sites on the surface of oxide system were the major factors that improved the catalytic activity. On the contrary, in [ 101 ] the positive influence of Ca and K addition on the catalytic activity of CZ materials in CO oxidation was directly demonstrated by the addition of these dopants during precipitation of double oxide.…”

Sawdust as an effective biotemplate for the synthesis of Ce0.8Zr0.2O2and CuO–Ce0.8Zr0.2O2catalysts for total CO oxidation

“…Improvement of the catalytic action of CZ in CO oxidation by the deliberate addition of Ca and K to CZ during co-precipitation with a subsequent calcination at 500 C was also observed in our previous study. 13 The facilitation of the formation of strongly nucleophilic peroxide and superoxide complexes upon the chemisorption of oxygen on CZ oxides conrmed by XPS and TPR data was proposed in this study as the most probable reason for the promotion effect of potassium. The stabilization of superoxide and peroxide species in the presence of alkali ions was demonstrated early.…”

“…These elements are known to serve as promoters for Ce-containing catalysts of soot and CO oxidation. 13,18 EDS element maps demonstrate the uniform distribution of Ce and Zr on the surface of all samples (see Fig. S1a and b in the ESI †), possibly due to the presence of a single phase containing both elements.…”

“…There is some evidence in literature that the addition of CaO [13][14][15][16][17] and alkali metals 13,18 inuences the catalytic properties of ceria and CZ systems. At the same time, they are among the main ash impurities in wood materials.…”

Application Prospect of K Used for Catalytic Removal of NOx, COx, and VOCs from Industrial Flue Gas: A Review

“…The addition of K to the Pt/TiO 2 [26] and CuO/CeO 2 [160] promotes the formation of oxygen vacancy, which enhances the oxygen storage capacity, and increases the number of surface active oxygen species. K increases the proportion of reactive oxygen species, the peroxide and superoxide formed, in the process of O 2 adsorption on the surface of Ce 0.8 Zr 0.2 O 2 [161]. K transfers electrons to the Ce-O bond on Ce-based catalysts, thus increases the reactivity of oxygen, and prevents the reduction of oxygen capacity [137].…”