Thermal stability of the layered modification of Cu<sub>0.5</sub>ZrTe<sub>2</sub> in the temperature range 25–900 °C

Shkvarina, E. G.; Titov, A. A.; Shkvarin, A. S.; Plaisier, Jasper R.; Gigli, Lara; Титов, А. Ф.

doi:10.1107/s2053229618009841

Cited by 14 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…X-ray diffraction experiments, shown in Figure 3a, indicate the Ni containing catalysts contain primarily metallic Ni. [19] The Cu containing catalysts have primarily metallic Cu, [20] but also contain some Cu 2 O phase, [21] in agreement with the XAS analysis, discussed below. Metallic Pt is present in the monometallic Pt/SiO 2 catalyst but no bulk Pt phases are observed in any of the bimetallic catalysts (Figure 3b).…”

Section: Dilute Alloy Catalyst Structuresupporting

confidence: 76%

Citral Hydrogenation over Dilute Alloy Catalysts

et al. 2023

View full text Add to dashboard Cite

Dilute alloy CuPt and NiPt catalysts are studied in the hydrogenation of citral, a model α,β‐unsaturated aldehyde. In situ and ex situ characterization is used to demonstrate that the Pt species within these nanoparticles are well dispersed and approach a single atom alloy structure. The distribution of Pt varies between the two host metal systems; under a hydrogen environment, the nanoparticle surface and near‐surface region of the NiPt nanoparticles is Pt rich, while the Pt is more uniformly distributed throughout the CuPt nanoparticles. When used for citral hydrogenation reactions, a rate enhancement is observed upon the addition of Pt to the Cu or Ni host catalysts, however this enhancement is determined to be due to the presence of additional metal and not a synergistic effect of the two metals. The Pt structure does, nonetheless, influence the observed selectivity trends. NiPt/SiO2 catalysts have high selectivity to the unsaturated aldehyde citronellal while the CuPt/SiO2 catalysts have increased selectivity to unsaturated alcohol products. This increased selectivity is attributed to a combination of hydrogen dissociation over Pt sites and a decrease in size of Cu ensembles due to the presence of Pt, which favors binding and hydrogenation of C=O rather than C=C bonds.

show abstract

Section: Dilute Alloy Catalyst Structuresupporting

confidence: 76%

Citral Hydrogenation over Dilute Alloy Catalysts

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Figure presents a series of X-ray diffraction (XRD) patterns obtained from the 30 to 5400 s subtracted by the first recorded pattern. Notably, a series of new characteristic peaks appear after 30 s of exposure under X-ray in addition to the typical Cu peaks . The intensity of these new peaks increases over time, whereas the intensity of the Cu peaks gradually decreases.…”

Section: Resultsmentioning

confidence: 97%

“…Notably, a series of new characteristic peaks appear after 30 s of exposure under X-ray in addition to the typical Cu peaks. 39 The intensity of these new peaks increases over time, whereas the intensity of the Cu peaks gradually decreases. This indicates the formation of one (or more) new species (s) on the Cu surface under X-ray irradiation.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Synchrotron X-ray-induced Synthesis of Copper Hydroxide Nitrate Nanoplates on Cu Thin Films in an Ambient Atmosphere

Hui

Luo

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Synchrotron X-rays are widely used for material characterizations. However, they can also ionize atoms and molecules to damage and manipulate probed materials. We report here an X-ray-induced growth of copper hydroxide nitrate, Cu2(OH)3NO3, on copper thin films in the ambient atmosphere without solvents and thermal treatment. In situ synchrotron X-ray diffraction measurements showed that the time-dependent growth process of theCu2(OH)3NO3 is accompanied by the consumption of Cu metal and can be described by a sigmoidal model. The growth rate was reduced after the initial fast growth period. Scanning electron microscopy (SEM) images show that the isolated islands of Cu2(OH)3NO3 nanoplates formed in the beginning, which grew together with new nanoplates formed under continued X-ray irradiation. The result demonstrated that high-flux synchrotron X-rays may provide an unconventional approach to synthesizing and manipulating materials, which will inspire future investigation both experimentally and theoretically.

show abstract

“…All the studied materials crystallize in the layered trigonal-prismatic crystal structure. There are no signs of the transition to the cubic spinel structure typical for some intercalation compounds. , Cr atoms are distributed over the positions in the interlayer space (interlayer gap), which are octahedrally (octa-positions) and tetrahedrally (tetra-positions) neighbored by the Se atoms at x > 0.1. This distribution makes the c ( x ) behavior nonmonotonic.…”

Section: Resultsmentioning

confidence: 99%

Electronic and Crystal Structure of New Cr_xZrSe₂ Intercalation Compounds

Shkvarin,

Merentsov,

Postnikov

et al. 2024

Inorg. Chem.

View full text Add to dashboard Cite

New intercalation compounds Cr x ZrSe 2 were synthesized and thoroughly studied. Cr atoms were found to occupy the positions both tetrahedrally and octahedrally coordinated by the Se atoms in the interlayer gap. The magnetic properties and electrical resistivity were studied in the temperature ranges of 2.4−300 K and 80−340 K, respectively. The compounds change their behavior from semiconducting (x = 0.1) to metallic (x > 0.1). The magnetic interaction strongly depends on the Cr content and temperature. The spin-glass state with antiferromagnetic interaction exists at T < T crit for Cr x ZrSe 2 with x ≤ 0.2, while at x ≥ 0.3 ferromagnetic contribution arises as well. The single crystals of Cr x ZrSe 2 were grown to study the electronic structure of the materials. A combination of the X-ray photoelectron spectroscopy (including that across Cr 2p-3d and Zr 3p-4d resonance) and X-ray absorption spectroscopy methods allowed to propose the location of the Cr 3d-states in the Se 3p−Zr 4d energy gap.

show abstract

Thermal stability of the layered modification of Cu_0.5ZrTe₂ in the temperature range 25–900 °C

Cited by 14 publications

References 23 publications

Citral Hydrogenation over Dilute Alloy Catalysts

Citral Hydrogenation over Dilute Alloy Catalysts

Synchrotron X-ray-induced Synthesis of Copper Hydroxide Nitrate Nanoplates on Cu Thin Films in an Ambient Atmosphere

Electronic and Crystal Structure of New Cr_xZrSe₂ Intercalation Compounds

Contact Info

Product

Resources

About

Thermal stability of the layered modification of Cu0.5ZrTe2 in the temperature range 25–900 °C

Cited by 14 publications

References 23 publications

Citral Hydrogenation over Dilute Alloy Catalysts

Citral Hydrogenation over Dilute Alloy Catalysts

Synchrotron X-ray-induced Synthesis of Copper Hydroxide Nitrate Nanoplates on Cu Thin Films in an Ambient Atmosphere

Electronic and Crystal Structure of New CrxZrSe2 Intercalation Compounds

Contact Info

Product

Resources

About

Thermal stability of the layered modification of Cu_0.5ZrTe₂ in the temperature range 25–900 °C

Electronic and Crystal Structure of New Cr_xZrSe₂ Intercalation Compounds