Gd–Bi–Ce–O materials as catalysts in CO oxidation

Abstract

Ceria-based solid solutions doped by Gd and/or Bi were synthesized by co-precipitation method from acid aqueous solution of cerium, gadolinium, and bismuth salts, followed by calcination at the temperature of 500°C. Characterization of the synthesized samples by many methods was carried out. It is shown that all obtained powders of solid solutions crystallized into a cubic structure of the fluorite type, with an average particle size of 10-17 nm, and for the sample obtained through intermediate acetylacetonate complexes was 5-8 nm. The samples had a mesoporous structure with a pore diameter of 2-5 nm. These systems were tested as the catalysts in CO oxidation in the model gas mixture by the flow method. Gd 0.05 Bi 0.15 Ce 0.8 O 2 system obtained through intermediate acetylacetonates has the highest activity, so this sample can be used as a catalyst.

Investigation of structure and morphology of Cu-Mn-Zr-Ce-O solid solutions

“…No micropores (< 2 nm, according to t-plot method) were observed in all samples, and no regularity in the change of Cu / Mn ratio was too. Unfortunately, this method did not allow creating narrow monomodal pore size distribution as in our earlier work [13,14], but it may be done by using acetylacetone. Table 1).…”

Effect of Bi3+ Ion Concentration on Physicochemical, Optical and Catalytic Properties of One‐Pot Combustion Synthesized Nanocrystalline Bi‐Doped La2O3

“…In literature, various types of catalysts have been investigated for CO oxidation reaction in which particularly platinum group metals based catalysts show very high activity . Recently, Zagaynov reported the catalytic behavior of Bi and Gd doped CeO 2 compounds for CO oxidation reaction and found that Bi doped CeO 2 shown higher catalytic activity compared to Gd doped CeO 2 . In our studies we have tested Bi doped in La 2 O 3 compounds for the same reaction.…”