Synthesis of CuAlO2 from chemically precipitated nano-sized precursors

Akyıldız, Hasan

doi:10.1016/j.ceramint.2015.07.031

Cited by 12 publications

(9 citation statements)

References 54 publications

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“…As the band is broad, it is likely that the absorption band may be due to three different types of Cu 2+ complexes including divalent complexes charge compensated by an Al pair (e.g., [Cu(H 2 O) 6 ] 2+ ), monovalent, single Al charge compensated complexes (e.g., [Cu-OH(H 2 O) 5 ] + ), and complexes involving organic ligands. The CZ-SSE exhibits increased absorption in the region between 350 and 620 nm, which can be assigned to charge transfer in O–Cu–O and Cu–O–Cu linear copper systems like CuO . This is also evidenced in the UV–vis studies of copper loading in zeolites where higher copper loadings are accompanied by an increase in oxidic copper species .…”

Section: Resultsmentioning

confidence: 75%

“…46 CZ-SSE also has a shoulder at around 300 nm that has previously been observed in optical transmission studies of CuAlO 2 . 49 Overall, the UV−vis data indicate that both samples clearly evidence the presence of copper speciation, with the CZ-SSE clearly exhibiting multiple copper environments.…”

Section: Resultsmentioning

confidence: 83%

“…46 The broad absorption band at 800 nm in the CZ-WIE and CZ-SSE is assigned to the d → d transition of isolated distorted octahedral hexa-aqua complexes of Cu 2+ and has been previously identified in Cu-SSZ-13, 37 Cu-ZSM-5, 47 Cu-SAPO-34, 25 and Cu-BEA. 48 As the band is broad, it is likely that the absorption band may be due to three different types of Cu 49 This is also evidenced in the UV−vis studies of copper loading in zeolites where higher copper loadings are accompanied by an increase in oxidic copper species. 46 CZ-SSE also has a shoulder at around 300 nm that has previously been observed in optical transmission studies of CuAlO 2 .…”

Section: Resultsmentioning

confidence: 88%

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Elucidating the Significance of Copper and Nitrate Speciation in Cu-SSZ-13 for N₂O Formation during NH₃-SCR

et al. 2021

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Unwanted N2O formation is a problem that has been noted in selective catalytic reduction (SCR) where copper zeolite catalysts are utilized. With its immense global warming potential and long-term stability, elevated atmospheric N2O has already been identified as a future challenge in the war on climate change. This paper explores the phenomenon of N2O formation during NH3-SCR over Cu-SSZ-13 catalysts, which are currently commercialized in automotive emissions control systems, and proposes a link between N2O production and the local copper environment found within the zeolite. To achieve this, a comparison is made between two Cu-SSZ-13 samples with different copper co-ordinations produced via different synthesis methods. A combination of synchrotron X-ray absorption near-edge spectroscopy, UV–vis, Raman, and density functional theory (DFT) is used to characterize the nature of copper species present within each sample. Synchrotron IR microspectroscopy is then used to compare their behavior during SCR under operando conditions and monitor the evolution of nitrate intermediates, which, along with further DFT, informs a mechanistic model for nitrate decomposition pathways. Increased N2O production is seen in the Cu-SSZ-13 sample postulated to contain a linear Cu species, providing an important correlation between the catalytic behavior of Cu-zeolites and the nature of their metal ion loading and speciation.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 88%

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Elucidating the Significance of Copper and Nitrate Speciation in Cu-SSZ-13 for N₂O Formation during NH₃-SCR

et al. 2021

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“…When CuCrO2 nanoparticles are doped with Zn atoms, they occupy the site of Cr atoms. On the other hand, since the ionic radius of Zn is larger than that of Cr, some Zn atoms prefer to locate in or near the crystallite boundary regions [23]. These Zn atoms can prevent crystallite growth and induce lattice distortion [24].…”

Section: Resultsmentioning

confidence: 99%

Conductivity improvement of CuCrO2 nanoparticles by Zn doping and their application in solid-state dye-sensitized solar cells

Asemi

Ghanaatshoar

2016

Ceramics International

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Undoped and Zn-doped CuCrO2 nanoparticles were synthesized by sol-gel method as promising wide band gap p-type semiconductor materials for solid-state dye-sensitized solar cells (DSSCs). We studied the influence of Zn dopant concentration on structural, electrical and optical properties of CuCrO2 nanoparticles. The X-ray diffraction data indicated that the delafossite-to-spinel ferrite phase transition occurs by increasing the amount of Zn doping. The average nanoparticle size was determined about 40 nm. A minimum value of electrical resistivity of 5.7 Ωcm was obtained for doping concentration of 5%. Having optimized the Zn-doped CuCrO2 nanoparticles, solid-state DSSCs were fabricated using undoped and Zn-doped CuCrO2 (5%) as solid electrolytes. As the photoanode layer, the vertically aligned TiO2 nanorod arrays were grown on FTO glass using a hydrothermal method. Compared with undoped CuCrO2, the Zn-doped nanoparticles exhibited an improvement in photovoltaic properties. The overall efficiency enhancement of 39% was obtained for the dopant concentration of 5%. The improved power conversion efficiency is attributed to the lowered electrical resistivity and enlarged work function of Zn-doped CuCrO2 nanoparticles.

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“…Hence, finding the stability of nanofluids is a great challenge in the two-step technique. Cuprous aluminate delafossite (CuAlO 2 ) nanostructured has been synthesized for some time using chemical or physical routes [11,15,16]. Among all the techniques which have been employed to fabricate CuAlO 2 nanostructured, the water-based nanofluid loaded one-dimensional delafossite CuAlO 2 nanowire has not yet been explored deeply.…”

Section: Introductionmentioning

confidence: 99%

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO₂ Nanowires: Structural and Thermal Properties

Alhummiany

2018

Journal of Nanomaterials

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Ultra-high cooling performance is a crucial requirement of many thermomechanical systems, such as microelectronic devices, engine cooling systems, nuclear power systems, chemical reactors, and refrigeration systems. Recent experimental results reveal the potential thermal properties of suspended nanometallics in conventional fluids. In this study, the facile synthesis of one-dimensional delafossite CuAlO 2 nanowires by microwave hydrothermal treatment was presented. A novel type of nanofluid consisting of CuAlO 2 nanowires suspended in distilled water at various volume fractions (0.0, 0.2, 0.4, and 0.6 wt%) was successfully synthesized using an easily scalable sonication method. The microstructures of as-synthesized CuAlO 2 were investigated by adopting X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and field-emission scanning electron microscopy (FESEM). Furthermore, the thermal conductivity and specific heat capacity of water-loaded nanofluid were measured at different volume fractions and temperatures. The results reveal a significant increase in thermal conductivity with increasing CuAlO 2 loading levels and temperatures. The obtained results propound the fact that water-loaded delafossite CuAlO 2 nanowires-based nanofluid is a promising candidate for future industrial applications.

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Synthesis of CuAlO2 from chemically precipitated nano-sized precursors

Cited by 12 publications

References 54 publications

Elucidating the Significance of Copper and Nitrate Speciation in Cu-SSZ-13 for N₂O Formation during NH₃-SCR

Elucidating the Significance of Copper and Nitrate Speciation in Cu-SSZ-13 for N₂O Formation during NH₃-SCR

Conductivity improvement of CuCrO2 nanoparticles by Zn doping and their application in solid-state dye-sensitized solar cells

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO₂ Nanowires: Structural and Thermal Properties

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Synthesis of CuAlO2 from chemically precipitated nano-sized precursors

Cited by 12 publications

References 54 publications

Elucidating the Significance of Copper and Nitrate Speciation in Cu-SSZ-13 for N2O Formation during NH3-SCR

Elucidating the Significance of Copper and Nitrate Speciation in Cu-SSZ-13 for N2O Formation during NH3-SCR

Conductivity improvement of CuCrO2 nanoparticles by Zn doping and their application in solid-state dye-sensitized solar cells

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO2 Nanowires: Structural and Thermal Properties

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Product

Resources

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Elucidating the Significance of Copper and Nitrate Speciation in Cu-SSZ-13 for N₂O Formation during NH₃-SCR

Elucidating the Significance of Copper and Nitrate Speciation in Cu-SSZ-13 for N₂O Formation during NH₃-SCR

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO₂ Nanowires: Structural and Thermal Properties