Undoped tetragonal ZrO2 obtained by the Pechini method: thermal evaluation of tetragonal–monoclinic phase transition and application as catalyst for biodiesel synthesis

Neris, Alex de Meireles; Ferreira, J. M.; Fonseca, Maria G.; Santos, I. M. G.

doi:10.1007/s10973-020-09286-7

Cited by 24 publications

(8 citation statements)

References 60 publications

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“…At 500 °C, the ZrO 2 sample exhibited a tetragonal structure, while the sample calcined in the temperature range of 600–800 °C showed the presence of both tetragonal and monoclinic structures. 31 However, the sample calcined at 900–1000 °C exhibited only the monoclinic ZrO 2 phase. Bhagwat et al 32 synthesized Cu–ZrO 2 samples containing 2–20 mol% Cu and observed that ZrO 2 existed in both tetragonal and cubic phases for all the samples with some volume percent of the monoclinic phase.…”

Section: Resultsmentioning

confidence: 99%

Evaluating the efficacy of nanosized CuZnAl and CuZnZr mixed oxides for electrocatalytic CO₂ reduction

Mostafa

Halwani

et al. 2023

Dalton Trans.

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Section: Resultsmentioning

confidence: 99%

Evaluating the efficacy of nanosized CuZnAl and CuZnZr mixed oxides for electrocatalytic CO₂ reduction

Mostafa

Halwani

et al. 2023

Dalton Trans.

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“…It is well known that ZrO 2 exists in three polymorphs at the atmospheric pressure [5]: the monoclinic, the tetragonal, and…”

Section: Crystal Structurementioning

confidence: 99%

“…As this oxide can be obtained in a highly dispersed state (as non-porous and porous powders or porous xerogels), it is widely applied as the catalysts, the adsorbent or the support for catalysts [1][2][3][4]. Its use as a photocatalyst is confined by a large band gap: 3.5-5.0 eV depending on preparation methods and calcination conditions [5][6][7][8]. Therefore, ZrO 2 exhibits photocatalytic activity only under UV-irradiation [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical and microwave treatment of precipitated zirconium dioxide and study of its physical–chemical, thermal and photocatalytic properties

Kucio

Sydorchuk²,

Khalameida³

et al. 2020

J Therm Anal Calorim

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The effects of the microwave treatment (MWT) and mechanochemical treatment (MChT) on the structure and physicochemical properties of precipitated zirconium oxide were investigated. The obtained materials were characterized using the N2 adsorption/desorption, thermogravimetry (TG, DTG, DTA), XRD and UV–Vis/DRS methods. Photocatalytic properties of the samples were also studied as regards the rhodamine B (RhB) degradation in the aqueous solution. The results show that the microwave and MChT, differing in mill rotation speed, temperature or treatment media, causes significant changes in the porous structure of the obtained samples. In most samples, the specific surface area increase was observed. The DTA and XRD results showed the formation of crystalline structure during MWT. As follows from the investigations, each way of modification results in the shift of the absorption edge toward higher wavelength values and causes photocatalytic degradation of RhB under UV irradiation and makes the obtained materials effective photocatalysts in the visible region.

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“…Zirconia (ZrO 2 ) is another example of a bifunctional catalyst which has found great interest in the materials science community as a prominent material for wide-ranging industrial applications, including biorefinery processes [8,[17][18][19][20][21][22]. A plethora of modified ZrO 2 catalysts has been investigated; however, the use of dopants is probably still the most common approach for promoting changes in structure, stability, reactivity and selectivity of these systems.…”

Section: Introductionmentioning

confidence: 99%

Cation-doping strategies for tuning of zirconia acid–base properties

Delarmelina

Catlow

2022

R. Soc. open sci.

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The role of Y-, Ca- and Ce-doping of cubic zirconia (c-ZrO 2 ) (111) surface on its acidity, basicity and the interplay between surface acid–base pairs is investigated by computational methods. The most stable surface structures for this investigation were initially determined based on previous studies of Y-doped c-ZrO 2 (111) and by a detailed exploration of the most stable configuration for Ca-doped c-ZrO 2 (111) and Ce-doped c-ZrO 2 (111). Next, surface mapping by basic probe molecules (NH 3 and pyridine) revealed a general reduction of the acidity of the surface sites, although a few exceptions were observed for zirconium ions at next nearest neighbour (NNN) positions to the oxygen vacancy and at the nearest neighbour (NN) position to the dopants. Adsorption of CO 2 over basic sites revealed a cooperative interplay between acid–base groups. In this case, however, the overall effect observed was the decrease of the calculated adsorption energies when compared with the pristine surface. Moreover, spontaneous formation of η 3 -CO 2 systems from initial η 2 -CO 2 configurations indicates a decrease in the required energy for forming oxygen vacancies in the doped ZrO 2 systems at NNN positions or further away from the existing vacancy site.

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Undoped tetragonal ZrO2 obtained by the Pechini method: thermal evaluation of tetragonal–monoclinic phase transition and application as catalyst for biodiesel synthesis

Cited by 24 publications

References 60 publications

Evaluating the efficacy of nanosized CuZnAl and CuZnZr mixed oxides for electrocatalytic CO₂ reduction

Evaluating the efficacy of nanosized CuZnAl and CuZnZr mixed oxides for electrocatalytic CO₂ reduction

Mechanochemical and microwave treatment of precipitated zirconium dioxide and study of its physical–chemical, thermal and photocatalytic properties

Cation-doping strategies for tuning of zirconia acid–base properties

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Undoped tetragonal ZrO2 obtained by the Pechini method: thermal evaluation of tetragonal–monoclinic phase transition and application as catalyst for biodiesel synthesis

Cited by 24 publications

References 60 publications

Evaluating the efficacy of nanosized CuZnAl and CuZnZr mixed oxides for electrocatalytic CO2 reduction

Evaluating the efficacy of nanosized CuZnAl and CuZnZr mixed oxides for electrocatalytic CO2 reduction

Mechanochemical and microwave treatment of precipitated zirconium dioxide and study of its physical–chemical, thermal and photocatalytic properties

Cation-doping strategies for tuning of zirconia acid–base properties

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Product

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Evaluating the efficacy of nanosized CuZnAl and CuZnZr mixed oxides for electrocatalytic CO₂ reduction

Evaluating the efficacy of nanosized CuZnAl and CuZnZr mixed oxides for electrocatalytic CO₂ reduction