Preparation of mesoporous nanocrystalline CuO–ZnO–Al2O3 catalysts for the H2 purification using catalytic preferential oxidation of CO (CO-PROX)

Andache, Mahmood; Kharat, Ali Nemati; Rezaei, Mehran

doi:10.1016/j.ijhydene.2019.08.197

Cited by 24 publications

(4 citation statements)

References 40 publications

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“…The TPR results of Figures 5 are in accordance with the phases identified by XRD, literature reports and thermodynamic data, showing characteristic profiles of CuO (Andache et al, 2019). The surface morphology and energy-dispersed chemical analysis (SEM-EDS) of the TCu oxygen carrier were evaluated by Scanning Electron Microscopy (SEM), as shown in Figure 6 and 7, respectively.…”

Section: Oxygen Carrier Characterizationssupporting

confidence: 81%

Evaluating the reactivity of CuO-TiO2 oxygen carrier for energy production technology with CO2 capture

Albuquerque¹,

Melo²,

Medeiros³

et al. 2021

RSD

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Chemical looping combustion (CLC) processes have been shown to be promising and effective in reducing CO2 production from the combustion of various fuels associated with the growing global demand for energy, as it promotes indirect fuel combustion through solid oxygen carriers (SOC). Thus, this study aims to synthesize, characterize and evaluate mixed copper and titanium oxide as a solid oxygen carrier for use in combustion processes with chemical looping. The SOC was synthesized based on stoichiometric calculations by the polymeric precursor method and characterized by: X-ray fluorescence (XRF), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM-FEG) with EDS, and Programmed Temperature Reduction (PTR). The oxygen carrying capacity (ROC) and the speed index of the reduction and oxidation cycles were evaluated by Thermogravimetric Reactivity (TGA). The main reactive phase identified was: The CuO phase for the mixed copper and titanium oxide were identified and confirmed by X-ray diffraction using the Rietveld refinement method. The reactivity of the CuO-TiO2 system was high, obtaining a CH4 conversion rate above 90% and a speed index of 40%/min. Due to the structural characteristics and the reactivity tests of this material, it is concluded that mixed copper and titanium oxide have the necessary requirements to be used in chemical looping combustion (CLC) processes.

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Section: Oxygen Carrier Characterizationssupporting

confidence: 81%

Evaluating the reactivity of CuO-TiO2 oxygen carrier for energy production technology with CO2 capture

Albuquerque¹,

Melo²,

Medeiros³

et al. 2021

RSD

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“…In present work an attempt is made to determine the factors influencing the CO oxidation process on nanoscale structures obtained by hydrothermal reduction of metal salts. We have applied this approach to the oxidation of CO on copper-containing systems, which are most traditionally used in the process of deep CO oxidation, as well as because of the increased interest in recent years to its application in this reaction [13][14][15]. Earlier [16] we studied the mechanism of hydrothermal reduction of metal salts with the production of the Cu-Co-Al oxide system and showed the formation of hydroxyoxalates as intermediate synthesis products.…”

Section: Doimentioning

confidence: 99%

SYNTHESIS, CHARACTERISTIC AND ACTIVITY OF NANOSIZED Cu–Me (Me–Co, Zn, Ni) OXIDE SYSTEMS IN CO OXIDATION IN THE PRESENCE OF H2

Jafarova¹

2021

AChJ

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Nanooxides of Cu–Me composition (Me–Co, Zn, Ni) were synthesized by hydrothermal reduction of metal salts with subsequent calcination and the influence of their properties (size, morphology, structure) on catalytic activity of deep CO oxidation reaction in the presence of H2 was considered. The nanooxides have been characterized by XRD and SEM methods. It was revealed that particles of Cu–Co–O are nanoplates (30–35 nm), and Cu–Zn–O (12.5–20 nm) are nanorods. The SEM method revealed a higher structural organization of the Cu–Сo–O particles than Cu–Zn–O; the growth of nanocrystals is shown by varying the magnification of the scale grid of images. The highest activity of the Cu–Co–O system was found among the mentioned and corresponding individual oxides. The effect of metal (Cu/Co) ratio on the dispersibility and morphology of nanoparticles and their activity has been studied. The non-additive increase in activity is explained by the redox properties of cobalt oxides and the contribution of copper to electronic state of this element. The variation of composition, as well as high dispersibility (30–35 nm) make it possible to reduce the temperature of oxidation beginning (T50%) of CO to less than 1150C

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“…Ti‐doped Ni/Al 2 O 3 catalysts were prepared by solution combustion method for CO methanation, and it was found that TiO x increased electron cloud density of Ni atoms, which could promote CO dissociation on the catalyst surfaces, leading to a relatively high catalytic performance . In addition, the CuO/ZnO/Al 2 O 3 catalysts, prepared by the coprecipitation method, exhibited high activity for CO methanation at low temperatures; however, its hydrothermal stability was poor . Although the Al 2 O 3 support has been greatly improved, there are still quite a few shortcomings such as relatively low surface area, unadjustable pore structure, and poor hydrothermal stability.…”

Section: Introductionmentioning

confidence: 99%

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation

et al. 2020

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To address the problems of sintering of Ni particles and poor low‐temperature activity of Ni‐based catalysts for CO methanation, MoOx‐doped (x < 3) ordered mesoporous Ni/Al2O3 catalysts are prepared by two different methods, including the impregnation method and evaporation‐induced self‐assembly (EISA) method. The samples before and after the catalytic reaction are thoroughly characterized by scanning electron microscopy and transmission electron microscopy. The ordered mesoporous structure is retained in all catalysts, whereas the ones prepared by the EISA method demonstrate high specific surface area, small Ni particle size, and high metal dispersion. After reduction in H2 flow, the Mo promoter is in the form of MoOx (x < 3) with the mixed valence of Mo (IV) and Mo (VI), which can increase the density of Ni atomic electron clouds and reduce the Ni particle size. The optimal mesoporous Ni‐Mo/Al2O3 catalyst reaches the maximum CO conversion and CH4 yield of 97.9% and 93.8%, respectively, at 375 °C, 0.1 MPa, and a weight hourly space velocity of 60 000 mL g−1 h−1. In addition, this catalyst demonstrates excellent stability in 100 h‐lifetime test at high space velocity owing to the confinement of the ordered mesoporous structure and the addition of MoOx promoter.

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Preparation of mesoporous nanocrystalline CuO–ZnO–Al2O3 catalysts for the H2 purification using catalytic preferential oxidation of CO (CO-PROX)

Cited by 24 publications

References 40 publications

Evaluating the reactivity of CuO-TiO2 oxygen carrier for energy production technology with CO2 capture

Evaluating the reactivity of CuO-TiO2 oxygen carrier for energy production technology with CO2 capture

SYNTHESIS, CHARACTERISTIC AND ACTIVITY OF NANOSIZED Cu–Me (Me–Co, Zn, Ni) OXIDE SYSTEMS IN CO OXIDATION IN THE PRESENCE OF H2

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation

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Preparation of mesoporous nanocrystalline CuO–ZnO–Al2O3 catalysts for the H2 purification using catalytic preferential oxidation of CO (CO-PROX)

Cited by 24 publications

References 40 publications

Evaluating the reactivity of CuO-TiO2 oxygen carrier for energy production technology with CO2 capture

Evaluating the reactivity of CuO-TiO2 oxygen carrier for energy production technology with CO2 capture

SYNTHESIS, CHARACTERISTIC AND ACTIVITY OF NANOSIZED Cu–Me (Me–Co, Zn, Ni) OXIDE SYSTEMS IN CO OXIDATION IN THE PRESENCE OF H2

MoOx‐Doped Ordered Mesoporous Ni/Al2O3 Catalyst for CO Methanation

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MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation