Promotion Effect of the Keggin Structure on the Sulfur and Water Resistance of Pt/CeTi Catalysts for CO Oxidation

Developing a catalyst with high SO2 and H2O resistance to achieve high-performance CO oxidation for specific industrial applications is highly desirable. Here, three catalysts were prepared using cerium titanium composite oxide (CeTi), molybdophosphate with Keggin structure-modified CeTi (Keg-CeTi), and molybdophosphate without Keggin structure-modified CeTi (MoP-CeTi) as supports, and their sulfur and water resistance in CO oxidation were tested. The characterization of XRD, BET, SO2/H2O-DRIFTS, XPS, TEM, SEM, NH3/SO2-TPD, H2-TPR, and ICP techniques revealed that the high SO2 and H2O resistance of Pt/Keg-CeTi in CO oxidation was related to its stronger surface acidity, better reduction of surface cerium and molybdenum species, and lower SO2 adsorption and transformation compared to Pt/CeTi and Pt/MoP-CeTi.

Synthesis and high proton conductive performance of indium-substituted Keggin-type quaternary heteropoly acid

The synthesis and characterization of indium-substituted Keggin structure quaternary heteropoly acid, H4[In(H2O)PW9Mo2O39]·11H2O (PMo9W2In), is reported. At 18 °C with 80% relative humidity, PMo9W2In displays the protonic conductivity as 2.32 ×10-4...

Metal-substituted tungstosulfates with Keggin structure: synthesis and characterization

Simple synthetic procedures for accessing novel metal-substituted tungstosulfates [SMW11O39]4− (M = Mn2+, Co2+, Ni2+, and Cu2+) with Keggin-type structures were developed.

Water-soluble titanium-polyoxomolybdate with external μ3 bridging oxygen coordination on a lacunary Keggin structure

The first water-soluble titanium-containing polyoxomolybdate was synthesized and structurally characterized, showing photocatalytic activity in benzaldehyde oxidation.

Keggin-structure heteropolyacid supported on alumina to be used in trans/esterification of high-acid feedstocks

Heteropolyacids (HPA) with Keggin structures, such as H3PMo12O40 (H3PMo), have been described as efficient catalysts in trans/esterifications of high-acid feedstocks due to their tolerance to water and free fatty acids contents.