Characterization and catalytic properties of some perovskites

Rezlescu, N.; Rezlescu, E.; Popa, P.D.; Doroftei, C.; Ignat, Maria

doi:10.1016/j.compositesb.2014.01.006

Cited by 45 publications

(19 citation statements)

References 37 publications

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“…The better catalyst performance of the perovskites compared to the ferrite catalysts under the same reaction conditions may be explained by the large increase in the oxygen vacancies in the surface regions generated by the presence of manganese ion with variable valence (Mn 3 þ -Mn 4 þ ) [49]. Although the mechanism of complete gas oxidation over metal oxide compounds is not precisely known, the interaction of surface active oxygen species with reactants ("suprafacial mechanism") is a widely accepted explanation for the VOCs full oxidation over oxide catalysts for T r 400 1C [50,51].…”

Section: Catalyst Activitymentioning

confidence: 98%

Some nanograined ferrites and perovskites for catalytic combustion of acetone at low temperature

Rezlescu

Popa

et al. 2015

Ceramics International

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Section: Catalyst Activitymentioning

confidence: 98%

Some nanograined ferrites and perovskites for catalytic combustion of acetone at low temperature

Rezlescu

Popa

et al. 2015

Ceramics International

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“…Some of these results were published in previous articles. 30,40 Results showing the temperature dependence of propane conversion in its combustion reaction over all catalysts are presented in Fig. 6.…”

Section: Catalytic Activitymentioning

confidence: 99%

Synthesis and characterization of some nanostructured composite oxides for low temperature catalytic combustion of dilute propane

Doroftei

Leontie

2017

RSC Adv.

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“…Chemically-stable high-temperature proton conductors, in particular electrolytes based on Y-doped BaZrO 3 , are extremely promising for applications in SOFCs operating at reduced temperatures, i.e., 600 °C and below. The advances made on improving the sinterability of powders, bringing the sintering temperatures at values similar to those needed for yttria-stabilized zirconia (YSZ) and allowing powder-based and low-cost fabrication technologies compatible with mass production, encourage the development of a next generation of anode-supported SOFCs based on proton-conducting electrolytes, operating at 600 °C with hydrogen or even hydrocarbon and alcohol fuels (figure 11.b) [24][25][26][27][28][29][30][31][32][33][34][35][36][37]. attaining a quite high densification (> 98%).…”

Section: Proton Conductivity In Oxides (Based On Work From the Solidmentioning

confidence: 98%

Recent advances in perovskites: Processing and properties

Moure

Peña

2015

Progress in Solid State Chemistry

169

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The perovskite structure is one of the most wonderful to exist in nature. It obeys to a quite simple chemical formula, ABX 3 , in which A and B are metallic cations and X, an anion, usually oxygen. The anion packing is rather compact and leaves interstices for large A and small B cations. The A cation can be mono, di or trivalent, whereas B can be a di, tri, tetra, penta or hexavalent cation. This gives an extraordinary possibility of different combinations and partial or total substitutions, resulting in an incredible large number of compounds. Their physical and chemical properties strongly depend on the nature and oxidation states of cations, on the anionic and cationic stoichiometry, on the crystalline structure and elaboration techniques, etc.In this work, we review the different and most usual crystalline representations of perovskites, from high (cubic) to low (triclinic) symmetries, some well-known preparation methods, insisting for instance, in quite novel and original techniques such as the mechanosynthesis processing. Physical properties are reviewed, emphasizing the electrical (proton, ionic or mixed conductors) and catalytic properties of Mn-and Co-based perovskites ; a thorough view on the ferroelectric properties is presented, including piezoelectricity, thermistors or pyroelectric characteristics, just to mention some of them ; relaxors, microwave and optical features are also discussed, to end up with magnetism, superconductivity and multiferroïsme.Some materials discussed herein have already accomplished their way but others have promising horizons in both fundamental and applied research.To our knowledge, no much work exists to relate the crystalline nature of the different perovskite-type compounds with their properties and synthesis procedures, in particular with the most recent and newest processes such as the mechanosynthesis approach. Although this is not intended to be a full review of all existing perovskite materials, this report offers a good compilation of the main compounds, their structure and microstructure, processing and relationships between these features.

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Characterization and catalytic properties of some perovskites

Cited by 45 publications

References 37 publications

Some nanograined ferrites and perovskites for catalytic combustion of acetone at low temperature

Some nanograined ferrites and perovskites for catalytic combustion of acetone at low temperature

Synthesis and characterization of some nanostructured composite oxides for low temperature catalytic combustion of dilute propane

Recent advances in perovskites: Processing and properties

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