Rietveld Refinement Based Quantitative Phase Analysis (QPA) of Ouargla (Part of Grand Erg Oriental in Algeria) Dunes Sand

Hadjadj, Khouloud; Chihi, Smail

doi:10.1007/s12633-020-00826-2

Cited by 13 publications

(2 citation statements)

References 34 publications

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“…The network parameters, unit cells with their respective volumes obtained by the refinement agree with the standard cards, showing a slight deviation from the theoretical values. The quality parameters of the Rietveld refinement are within acceptable indexes (GOF ~ 1), as reported by Hadjadj and Chihi, 40 confirming the reliability of the data obtained.…”

Section: Resultssupporting

confidence: 84%

Synthesis of MoO ₃ by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil

Silva

Farias

Melo

et al. 2022

Intl J of Energy Research

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Summary The MoO3 was synthesized on a pilot scale by combustion reaction and their catalytic performance was investigated to obtain biodiesel from residual oil by simultaneous reactions of transesterification and esterification (TES). The catalyst was characterized by X‐ray diffraction with respective Rietveld refinement, Fourier transform infrared, and RAMAN spectroscopies, scanning electron microscopy, determination of the specific surface area by the method of N2 adsorption (Brunauer, Emmett, and Teller), and acidity test by temperature‐programmed desorption of ammonia molecule. The catalytic properties were evaluated through catalytic tests while the products of the TES reactions were characterized by gas chromatography, kinematic viscosity, and acidity index. Such results indicated that single‐phase catalysts (α‐MoO3‐100%) and biphasic (h/α‐MoO3‐hexagonal 56.80% and orthorhombic 43.20%) were synthesized, which presented crystalline fraction and crystal size of 88% to 90% and 33 to 84 nm, respectively. The crystalline phases (α‐MoO3 and h/α‐MoO3) showed typical morphologies of microplate agglomerates, irregular rods, the surface area of 1.5 to 4.7 m2 g−1, and total acidity equivalent to 30 to 84 μmol g−1 NH3. The MoO3 was successfully synthesized by pilot‐scale combustion reaction and showed promising results, with high conversions to ethyl esters (between 93% and 99%), maintaining activity (useful life) after five consecutive reuse cycles. Thus, the catalysts studied have the potential to enable positive impacts on the environment and society in general.

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Section: Resultssupporting

confidence: 84%

Synthesis of MoO ₃ by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil

Silva

Farias

Melo

et al. 2022

Intl J of Energy Research

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“…According to the JCPDS (N o 01-086-2344), these results indicate the presence of calcite mineral (CaCO3) with a trigonal crystalline structure and belonging to the space group R-3c (167) (Oglesbee et al, 2020). Moreover, diffraction peaks (crystalline planes) at 11.65°(020), 20.87°(−121), 36.56°(-222), 39.46° (-161), and 43.19°(240) are induced by gypsum (CaSO4.2H2O) with a monoclinic crystal system and the space group I2/c, according to the JCPDS (No 01-074-1905) (Hadjadj et al, 2020). However, the XRD patterns of the Zegoum dune sand show peaks at 2θ°: 20.88°, 26.64°, 36.55°, 39.46°, 42.47°, 50.16°, 54.87°, 59.97°, 64.1°, 67.75°, 68.16°, 68.34°, 73.32°, 75.72°, and 81.49°, according to the JCPDS (N o 00-046-1045) corresponding to the (hkl) crystalline planes (100), ( 101), ( 210), ( 102), ( 111), ( 201), ( 112), ( 003), ( 211), ( 113), ( 212), ( 203), ( 301), ( 104), (302), and (310), respectively.…”

Section: Xrd Analysismentioning

confidence: 99%

A comparative analysis of the microstructural and physicochemical properties of alluvial and dune sands from northeast Algerian Sahara

Hachem

Meftah²,

Bouaziz

2023

J. Eng. Exact Sci.

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This paper investigates the physical, chemical, and microstructural properties of two types of natural sand; alluvial sands and dune sand from the El-Oued region in the northeastern Algerian Sahara. Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), X-ray Fluorescence (XRF), Scanning electron microscopy (SEM/EDS), and granulometry analysis have been performed. The FTIR and XRD analysis prove that the alluvial sand and dune sand consist of high percentages of ?-quartz (SiO2), low amounts of calcite (CaCO3), and gypsum minerals (CaSO4;2H2O). The chemical analysis confirmed that both types of sand have a high silica (SiO2) ratio, reaching 80% for dune sand and 70% for alluvial sand, besides very low quantities of Al2O3, Fe2O3, and K2O oxides. CaO content was higher in alluvial sand than in dune sand. The shapes of alluvial sand grain samples ranged from angular to well-rounded. However, the dune sands have shapes ranging from sub-angular to well-rounded. However, the dune sand is poorly graded sand with a mean grain size of 250?m; whereas, the alluvial sand is well-graded sand with a mean grain size of 406?m. These findings demonstrate that alluvial and dune sands are mineralogically stable and chemically suitable for use as fine aggregates in construction. Also, these sands could be significant sources of quartz minerals.

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The Development and Characteristics of Sand Seas in the Central Sahara

Knight,

Merlo

2023

World Geomorphological Landscapes

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Rietveld Refinement Based Quantitative Phase Analysis (QPA) of Ouargla (Part of Grand Erg Oriental in Algeria) Dunes Sand

Cited by 13 publications

References 34 publications

Synthesis of MoO ₃ by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil

Synthesis of MoO ₃ by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil

A comparative analysis of the microstructural and physicochemical properties of alluvial and dune sands from northeast Algerian Sahara

The Development and Characteristics of Sand Seas in the Central Sahara

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Rietveld Refinement Based Quantitative Phase Analysis (QPA) of Ouargla (Part of Grand Erg Oriental in Algeria) Dunes Sand

Cited by 13 publications

References 34 publications

Synthesis of MoO 3 by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil

Synthesis of MoO 3 by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil

A comparative analysis of the microstructural and physicochemical properties of alluvial and dune sands from northeast Algerian Sahara

The Development and Characteristics of Sand Seas in the Central Sahara

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Product

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Synthesis of MoO ₃ by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil

Synthesis of MoO ₃ by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil