New fuel governed combustion synthesis and improved luminescence in nanocrystalline Cr3+ doped ZnAl2O4 particles

Srinatha, N.; Reddy, S. Satyanarayana; Suriyamurthy, N.; Kumar, KJ. Rudresh; Kumar, MR. Suresh; Madhu, A.; Angadi, Basavaraj

doi:10.1016/j.rio.2022.100242

Cited by 13 publications

(3 citation statements)

References 37 publications

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“…The symmetry of the peaks decreased in the solids at lower zinc content, and the NiAl 2 O 4 species primarily occurred in the AZ15-500 material. The broader peaks in materials with lower zinc content were caused by the presence of spinel-type structures, which occur in aluminates and transitional aluminas [1,2,32,33,34].…”

Section: Resultsmentioning

confidence: 99%

Study of NiO/Al2O3 and NiO/Zn-Al2O3 catalysts for water gas shift reaction

Meza-Fuentes,

Rodríguez Ruíz,

Castellar Arroyo

et al. 2023

Universitas Scientiarum

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Nickel-based catalysts are of great importance for the generation of hydrogen from natural gas. Within this process, the conditions in which commercial NiO/Al2O3 is converted to Ni0/Al2O3 catalyst should be further investigated. A widely used technique to identify Ni2+ reduction conditions and the different compounds or types of particles in which this element is present is temperature-programmed reduction. In this work, the type of nickel oxide particles occurring on Al2O3 and ZnO-Al2O3-based supports were studied by different techniques, such as energy-dispersive X-ray spectroscopy, FTIR, the BET method, X-ray diffraction (XRD), and Temperature Programmed Reduction (TPR). All materials were evaluated in the water gas shift reaction (WGS), and the influence of their characteristics on the catalytic activity was assessed. Solids were prepared at different temperatures and Ni/Zn molar ratios. The results showed the presence of NiO in all materials, as well as the presence of ZnO, NiAl2O4, and ZnAl2O4 in materials prepared at higher temperatures. In all the materials calcined at the lowest temperature, the formation of NiO particles that fail to interact with the supports was prioritized. As the calcination temperature increased, NiO aggregates were formed, which, to a greater degree, interacted with the supports, whereby nickel aluminate was detected in all materials prepared at 750 °C. Zinc increased the selectivity but decreased specific surface area and activity through the WGS reaction. The solid labeled AZ15-500 showed higher activity and selectivity, reaching values of 100% for the water gas shift reaction.

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Section: Resultsmentioning

confidence: 99%

Study of NiO/Al2O3 and NiO/Zn-Al2O3 catalysts for water gas shift reaction

Meza-Fuentes,

Rodríguez Ruíz,

Castellar Arroyo

et al. 2023

Universitas Scientiarum

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“…The observed pattern with planes (111), (2 2 0), (3 1 1), (4 0 0), (331), (4 2 2), (5 1 1), (4 4 0), (620), and (533), which is in accordance with JCPDS Card No. 05-0669 [4]. It is evident that the spinel structure of undoped zinc aluminates, as well as Cu-and Mg-doped zinc aluminates, were not distorted by the inclusion of the small number of dopants.…”

Section: P-xrd Analysismentioning

confidence: 96%

Investigation of Transition Metal Ions Cu2+ and Mg2+ Doped Zinc Aluminate (ZnAl2O4) and Their Structural, Spectral, Optical, and Dielectric Study for High-Frequency Applications

Jamil,

Jeyakumar,

Deivasigamani

2023

Iocn 2023

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“…The semiconductor ZnAl 2 O 4 has fascinating characteristics that make it suitable for broad technological applications like sensors, photocatalysts, microwave devices, ceramic pigments and microelectronics. Also, due to its remarkable properties, like a high melting point and a large surface area, it is widely studied for high-temperature fuel cells, dielectric materials and other optoelectronic applications [1,2]. The substitution or doping of transition metal ions into the aluminate system results in the enhancement of its optical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%