Synthesis and Characterization of Ni-Cu/ZrO&lt;sub&gt;2&lt;/sub&gt; and Co-Cu/ ZrO&lt;sub&gt;2&lt;/sub&gt; Catalysts Used for Ethanol Steam Reforming

Bergamaschi, Vanderlei S.; Carvalho, F.M.S.; Santos, W.R.; Rodrigues, Clarissa Perdomo

doi:10.4028/www.scientific.net/msf.530-531.619

Cited by 5 publications

(2 citation statements)

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“…The vacancies developed in the oxygen sublattice play a vital role in the stabilization process [10]. Of particular interest is the Cu stabilized ZrO 2 system because the required doping concentration is very less, and its promising catalytic performance in several chemical reactions, including CO 2 hydrogenation and combustion [11,[15][16][17][18][19][20][21][22]. The charge transfer between Cu 2+ and Zr 4+ could be the main reason for such high catalytical activity of Cu/ZrO 2 system [9,20].…”

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confidence: 99%

Cubic phase stability, optical and magnetic properties of Cu-stabilized zirconia nanocrystals

Pramanik

Singh

Joshi

et al. 2018

J. Phys. D: Appl. Phys.

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By means of experimental and ab initio investigations, we report on the cubic phase stability of Cu doped zirconia (ZrO2) at room temperature, and further characterize its structural, optical and magnetic properties. Various compositions of Zr1−xCuxO2 (0.01 ⩽ x ⩽ 0.25) nanocrystallites of average size ∼16 nm were synthesized using co-precipitation technique. Thermal analysis and kinetics of crystallization revealed that the cubic phase at ambient temperature can be stabilized by using a critical calcination temperature of 500 °C for 8 h in air and a critical composition of . For x < xc, some undigested monoclinic phase of ZrO2 exists together with the cubic structure. However, for x > xc, the monoclinic CuO emerges as a secondary phase with shrinkage of unit-cell volume with increasing the Cu content. At x = 0.05 and 500 °C calcination temperature, we observe a high degree of cubic crystallinity which breaks down into monoclinic phase with increasing calcination temperature beyond 550 °C. Electron magnetic resonance studies provide evidence for the substitution of Cu2+ (2D5/9,3d9) ions at Zr4+ sites with g, g and average ga = ( + 2)/3 ∼ 2.1. The temperature dependence of magnetic susceptibility measurements from 2 K to 300 K exhibits Curie–Weiss behaviour whose analysis using ga = 2.1 and spin S = 1/2 yields x = 0.028 and x = 0.068 for the nominal x = 0.05 and x = 0.20 samples, respectively. This magnetic analysis confirms the findings from x-ray diffraction that only a part of Cu is successfully doped into cubic phase of Cu-doped ZrO2. The optical bandgap decreases with increasing x, which is due to the emergence of Cu-d states at Fermi-level near the valence bands, thus making Cu-doped zirconia a hole doped (p-type) semiconductor.

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confidence: 99%

Cubic phase stability, optical and magnetic properties of Cu-stabilized zirconia nanocrystals

Pramanik

Singh

Joshi

et al. 2018

J. Phys. D: Appl. Phys.

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“…In recent work, the authors have studied the reaction of ethanol over Ni/Cu and Co/Cu supported in zirconia [12].…”

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confidence: 99%

Hydrogen Production by Ethanol Steam Reforming Over Cu and Ni Catalysts Supported on ZrO2 and Al2O3 Microspheres

Bergamaschi

Carvalho

2008

MSF

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Ethanol reforming process to produce hydrogen rich-gas stream is performed using Cu/Ni catalyst supported on zirconia and alumina microspheres prepared by hydrolysis method. Theses catalysts were tested in a fixed-bed reactor system employing steam reforming of ethanol. The operating temperature was 550°C and water/ethanol feed ratio 3/1. Although all catalysts were very active for ethanol conversion and very selective towards the desired products, but that one supported on zirconia microspheres was produced slightly better results. The data reveal high activity of the Cu/Ni/ZrO2 catalyst for ethanol steam reforming and presented a good selectivity for H2.

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Production of Hydrogen by Steam Reforming of Ethanol

et al. 2013

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Synthesis and Characterization of Ni-Cu/ZrO<sub>2</sub> and Co-Cu/ ZrO<sub>2</sub> Catalysts Used for Ethanol Steam Reforming

Cited by 5 publications

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Cubic phase stability, optical and magnetic properties of Cu-stabilized zirconia nanocrystals

Cubic phase stability, optical and magnetic properties of Cu-stabilized zirconia nanocrystals

Hydrogen Production by Ethanol Steam Reforming Over Cu and Ni Catalysts Supported on ZrO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> Microspheres

Production of Hydrogen by Steam Reforming of Ethanol

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