Modified Ceria-Zirconia Fluorite-Like Catalysts for the Combustion of Methane

Kuznetsova, T. G.; Садыков, В. А.; Batuev, Lubsan; Мороз, Э. М.; Burgina, E. B.; Rogov, Vladimir A.; Kriventsov, V. V.; Kochubey, D.I.

doi:10.1016/s1003-9953(06)60022-4

Cited by 15 publications

(17 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10), except for those containing Fe and Ce. For the latter perovskites and those calcined at 500°С, no propor tionality was found between the concentration of extended defects and the amount of desorbed oxygen, [55]. For samples of series II, the amount of desorbed oxygen is determined mainly by the microheterogeneity and defect structure of crystallized perovskite (Fig.…”

Section: Tpd Omentioning

confidence: 93%

“…at 700 cm -1 ) [77]. The absence of the narrow bands in this region of the IR spectrum, which are typical for individual large MnO x oxide clusters [55], along with the weak resolution of the a.b. due to the vibrations of the lanthanum cation with respect to MnO 6 (the a.b.…”

Section: Nanocomposite Structure Of Low Temperature Perovskitesmentioning

confidence: 96%

“…In the oxidation of soot-a solid oxidized material composed of polyaromatic compounds-at a high level of total activity the subse quent stages of destruction/transformation reduce the specificity of the catalytic action and the differences in the composition of the perovskite surface. At the same time, a high content of weakly bound oxygen on such materials, as compared to Ce-Zr-O fluorites con taining easily reduced transition metal cations [55]) gives them a higher activity in the initiated oxidation reaction occurring with the participation of only cata lyst oxygen [25,26,122]. The differences in tempera ture of the start of such an initiation are 75-150°С.…”

Section: Catalytic Properties In Oxidation Reactionsmentioning

confidence: 99%

“…The method of polymerized organometallic precursors (PMPs) is successfully used in synthesizing highly dispersed binary Ce-Zr-O and more complex compositions with a rather homogeneous cation distribution [55,108,109]. The principle issue during synthesis is the relation between the metal cations and complex esters of citric acid (CA) and ethylene glycol for the forma tion of chelate like compounds of the necessary sto ichiometry in the solution.…”

Section: Nanocomposite Structure Of Low Temperature Perovskitesmentioning

confidence: 99%

“…For coarsely dispersed manganites (ferrites), the increase in the activity in the reaction of the CO oxi dation and С 1 -С 4 hydrocarbons combustion was mainly assigned to an increase in either the concentra tion of highly charged Mn 4+ (Fe 4+ ) cations, mobility of the lattice oxygen or the specific surface area [22,[55][56][57][58][59][60][61][62][63][64][65][66][67][68][69]. However, the stoichiometric orthorhombic per ovskite LaMnO 3 as a spatially uniform structure is formed in a rather narrow interval of conditions (at Т calc > 1000°С in a flow of inert gas) [70].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Nanocomposite structure and reactivity of perovskites based on lanthanum manganites

Кузнецова

Sadykov

Лунин

2012

Russ. J. Phys. Chem.

View full text Add to dashboard Cite

Data on the real/defect structure of anion excess lanthanum manganites are analyzed. It is shown that low temperature materials, especially those synthesized with the use of organic additives, form nano composite structure due to stabilization of manganese and dopant cations in highly charged states (≥4+) at anion excess. It is established that domains (layers) with perovskite structure containing point defects are sep arated/intergrown by extended defect regions enriched with lanthanum or promoter cations. It is noted that the composition and concentration of extended defects are controlled by the conditions of synthesis, the cal cination temperature, and the nature of the promoter; these defects, which are partly retained after high tem perature treatment, can affect the functional properties of materials. Features of the cation and anion modi fication of lanthanum manganites and the reactivity of nanocomposite structures with respect to oxidation reactions are analyzed. It is concluded that at a high content of weakly bound oxygen and a noticeable mobil ity of the lattice oxygen, the activity of these materials in various oxidation reactions is determined by their defect structure and specificity of the catalytic action.

show abstract

Section: Tpd Omentioning

confidence: 93%

Section: Nanocomposite Structure Of Low Temperature Perovskitesmentioning

confidence: 96%

Section: Catalytic Properties In Oxidation Reactionsmentioning

confidence: 99%

Section: Nanocomposite Structure Of Low Temperature Perovskitesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nanocomposite structure and reactivity of perovskites based on lanthanum manganites

Кузнецова

Sadykov

Лунин

2012

Russ. J. Phys. Chem.

View full text Add to dashboard Cite

show abstract

Impact of Flame Conditions on the Pd‐O Structure and Methane Oxidation Activity over Ceria Support

Wang,

Najimu,

et al. 2024

ChemCatChem

View full text Add to dashboard Cite

In this work, we employed flame spray pyrolysis (FSP), a high‐temperature synthesis method, to control the formation of Pd structures on the CeO2 support. Multiple types of Pd structures deposited on CeO2 are observed on FSP‐made samples. Our results show that the oxidizing environment during FSP synthesis facilitates the formation of incorporated Pd2+ structures, along with highly dispersed Pd2+, Pd0 nanoparticles, and Pd0 clusters formed under the reducing synthesis condition. Notably, these Pd2+ species remained stable at temperatures up to 400 °C. The catalysts containing both highly dispersed Pd2+ nanoparticles and incorporated Pd2+ species demonstrated superior methane oxidation activity, with higher turnover frequencies than those containing only one type of Pd2+ structure. However, hydrothermal pretreatment in the presence of water vapor led to partial deactivation, likely due to structural alterations in the Pd species or the interaction with the CeO2 support, which reduced the stability and effectiveness of the active sites. This study underscores the importance of both highly dispersed and incorporated Pd2+ species in enhancing catalytic performance and highlights the challenges posed by water‐induced deactivation in practical applications.

show abstract

Pd enhanced WC catalyst to promote heterogeneous methane combustion

Terracciano

Oliveira

Siddhanti

et al. 2017

Applied Thermal Engineering

View full text Add to dashboard Cite

Within this work, a MgO stabilized ZrO2 (MSZ) porous media with and without a gadolinia doped ceria (Ce0.8Gd0.2O1.9, GDC) catalyst coating has been evaluated in heterogeneous combustion of mixtures of methane and air at different equivalence ratios inside of a porous combustor. The temperature distribution within the combustion chamber along with optical and acoustic emissions profiles from the exhaust side of the combustion chamber have been analyzed to characterize performance of the combustor. It was shown that enhancement of MgO-ZrO2 ceramic surfaces with up to 5 wt% GDC ceramic coating provides a significant enhancement to the chemical reactions occurring during heterogeneous combustion. The placement of the GDC catalyst enables (i) higher temperatures through the combustion chamber; (ii) increases in maximum heating rates for fixed reactant flow rates; as well as (iii) extending the operating limits of the combustor.

show abstract

Modified Ceria-Zirconia Fluorite-Like Catalysts for the Combustion of Methane

Cited by 15 publications

References 32 publications

Nanocomposite structure and reactivity of perovskites based on lanthanum manganites

Nanocomposite structure and reactivity of perovskites based on lanthanum manganites

Impact of Flame Conditions on the Pd‐O Structure and Methane Oxidation Activity over Ceria Support

Pd enhanced WC catalyst to promote heterogeneous methane combustion

Contact Info

Product

Resources

About