Synthesis and study of ferri-diopside ceramic pigments

Dimitrov, Tsvetan; Titorenkova, Rositsa; Zaichuk, A. V.; Tzvetanova, Y.

doi:10.32434/0321-4095-2022-140-1-39-46

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…It leads to an increase in the activity and a decrease in the work function of electrons from the iron surface. Other reports also indicated that introducing Eu 2 O 3 [50] or CeO 2 [50][51][52][53][54] develops the surface area and increases the porosity of the reduced iron catalyst.…”

Section: Iron-based Catalystsmentioning

confidence: 99%

Lanthanide Oxides in Ammonia Synthesis Catalysts: A Comprehensive Review

Patkowski,

Zybert,

Ronduda

et al. 2023

Catalysts

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The production of ammonia through the Haber–Bosch process is a large-scale catalytic industrial endeavour with substantial energy consumption. A key area of energy optimisation for this process involves efforts to ease the synthesis reaction conditions, particularly by reducing the operating pressure. To achieve this goal, new catalysts are designed to function effectively at lower pressures and temperatures. In recent years, reports in the literature concerning including lanthanide oxides in the catalysts’ composition have started appearing more frequently. This review article offers a concise overview of the pivotal role that lanthanide oxides play in the field of ammonia synthesis catalysts. The paper delves into the diverse utilisation of lanthanide oxides, emphasising their role in catalytic systems. The review explores recent advances in the design of catalysts incorporating lanthanide oxides as promoters or support materials, highlighting their impact on enhancing catalyst stability, activity, and operation. Three main groups of catalysts are discussed, where iron, ruthenium, and cobalt constitute the active phase. Insights from recent research efforts are synthesised to provide a comprehensive perspective on the application prospects of lanthanide oxides in ammonia synthesis catalysts.

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Section: Iron-based Catalystsmentioning

confidence: 99%

Lanthanide Oxides in Ammonia Synthesis Catalysts: A Comprehensive Review

Patkowski,

Zybert,

Ronduda

et al. 2023

Catalysts

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“…Therefore, stable ceramic pigments of various colours can be obtained, particularly based on the diopside mineral CaO•MgO•2SiO 2 . During firing, the processes of isomorphic substitution, as a rule, of Mg 21 by Co 21 , Ni 21 , Mn 21 and Fe 21 ions occur in the diopside structure, and it determines the formation of a particular colour (Maslennikova and Pisch, 2009;Dimitrov et al, 2017;Dimitrov et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…The addition of NiO into the composition of diopside pigments in the amount of 0.3-0.8 mol instead of MgO leads to the formation of a light green colour of varying intensity. When MgO is replaced by MnO or FeO in the diopside, brown pigments are predominantly synthesised (Maslennikova and Pisch, 2009;Dimitrov et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Cobalt-containing diopside pigments based on granulated blast furnace slag

Zaichuk

Amelina²,

Hordieiev³

2023

PRT

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Purpose The purpose of this study was to the low-temperature synthesis of cobalt-containing diopside pigments based on granulated blast furnace slag and to study the characteristics of the mineral formation processes, changes in the structure and colour indices. Design/methodology/approach Synthesis of cobalt-containing diopside pigments based was carried out by the directional formation of the mineralogical composition with the introduction of part of the components using granulated blast-furnace slag. Findings It has been established that the formation of the diopside phase in pigments containing blast-furnace slag as the main component proceeds at low temperatures (1,100°C–1,150 °C). The colour of diopside pigments is formed because of the isomorphic substitution of Si4+ ions for Al3+ ions and Mg2+ ions for Co2+ ions. It is expedient to add CoO in an amount of 0.9 mol (18 Wt.%) into the composition of diopside pigments based on blast-furnace slag to obtain defect-free violet glazes. Practical implications The developed diopside pigments enable obtaining of high-quality violet glazes for ceramics. The application of the obtained results can significantly reduce the consumption of traditional raw materials in the composition of silicate ceramic pigments, as well as reduce their firing temperature. Originality/value Calcium, magnesium and silicon oxides are the main components of blast-furnace slag. In addition, granulated blast furnace slag is mainly represented by the glassy phase, which determines its high activity during the firing process. These factors are prerequisites for using the blast-furnace slag as a valuable substitute for chemically pure or natural raw materials in silicate pigments and reducing their firing temperature.

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Synthesis and study of ferri-diopside ceramic pigments

Cited by 2 publications

References 13 publications

Lanthanide Oxides in Ammonia Synthesis Catalysts: A Comprehensive Review

Lanthanide Oxides in Ammonia Synthesis Catalysts: A Comprehensive Review

Cobalt-containing diopside pigments based on granulated blast furnace slag

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