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934 results on '"Adil, Syed A."'

59. FexOy Nanoparticles Doped Spinel Nickel Aluminate as Partial Oxidation Catalyst: Synthesis, Characterization and Catalytic Evaluation.

Author

Abasaeed, Ahmed E., Adil, Syed Farooq, Kuniyil, Mufsir, Ahmed, Hamid, Ibrahim, Ahmed A., Fakeeha, Anis H., and Al-Fatesh, Ahmed S.

Subjects
*PARTIAL oxidation, *CATALYST synthesis, *NICKEL catalysts, *NANOPARTICLES, *ALUMINATES, *SPINEL, *NICKEL ferrite
Abstract

Spinel nickel aluminate samples are doped with various percentages of FexOy nanoparticles (1, 5, and 10%) wherein FexOy i.e. Fe2O3 and Fe3O4, are tested as a catalyst for the partial oxidation of methane. The as-synthesized nanocomposite materials were characterized by XRD, FTIR, and N2 adsorption–desorption techniques and the surface morphology was examined by HRTEM. The reduction behavior and the basicity were measured using H2-TPR and CO2-TPD techniques. The synthesized nanocomposites exhibit superior catalytic activity towards the partial oxidation of methane. The nanocomposite with 5% FexOy doping exhibited the highest catalytic activity (68%) at 600 °C along with the highest H2 selectivity (32%) among the 3 nanocomposites. Conversion of methane was increasing gradually and the time-on-stream of 4 h displayed higher activity and a stable profile when the reaction temperature was set to 600 °C. [ABSTRACT FROM AUTHOR]

Published
2024
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72. Green, Solvent-Free Mechanochemical Synthesis of Nano Ag2O/MnO2/N-Doped Graphene Nanocomposites: An Efficient Catalyst for Additive-Base-Free Aerial Oxidation of Various Kinds of Alcohols

Author

Hatshan, Mohammad Rafe, primary, Khan, Mujeeb, additional, Assal, Mohamed E., additional, Shaik, Mohammed Rafi, additional, Kuniyil, Mufsir, additional, Al-warthan, Abdulrahman, additional, Siddiqui, Mohammed Rafiq H., additional, and Adil, Syed Farooq, additional

Published
2024
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87. Coarse-Grained Simulations on Polyethylene Crystal Network Formation and Microstructure Analysis.

Author

Hussain, Mohammed Althaf, Yamamoto, Takashi, Adil, Syed Farooq, and Yao, Shigeru

Subjects
CRYSTAL growth, MICROSTRUCTURE, HIGH density polyethylene, CRYSTAL models, POLYETHYLENE, POLYMER networks, STRESS-strain curves, BIODEGRADABLE plastics
Abstract

Understanding and characterizing semi-crystalline models with crystalline and amorphous segments is crucial for industrial applications. A coarse-grained molecular dynamics (CGMD) simulations study probed the crystal network formation in high-density polyethylene (HDPE) from melt, and shed light on tensile properties for microstructure analysis. Modified Paul–Yoon–Smith (PYS/R) forcefield parameters are used to compute the interatomic forces among the PE chains. The isothermal crystallization at 300 K and 1 atm predicts the multi-nucleus crystal growth; moreover, the lamellar crystal stems and amorphous region are alternatively oriented. A one-dimensional density distribution along the alternative lamellar stems further confirms the ordering of the lamellar-stack orientation. Using this plastic model preparation approach, the semi-crystalline model density ( ρ c r ) of ca. 0.913 g·cm−3 and amorphous model density ( ρ a m ) of ca. 0.856 g·cm−3 are obtained. Furthermore, the ratio of ρ c r / ρ a m ≈ 1.06 is in good agreement with computational (≈1.096) and experimental (≈1.14) data, ensuring the reliability of the simulations. The degree of crystallinity ( χ c ) of the model is ca. 52% at 300 K. Nevertheless, there is a gradual increase in crystallinity over the specified time, indicating the alignment of the lamellar stems during crystallization. The characteristic stress–strain curve mimicking tensile tests along the z-axis orientation exhibits a reversible sharp elastic regime, tensile strength at yield ca. 100 MPa, and a non-reversible tensile strength at break of 350%. The cavitation mechanism embraces the alignment of lamellar stems along the deformation axis. The study highlights an explanatory model of crystal network formation for the PE model using a PYS/R forcefield, and it produces a microstructure with ordered lamellar and amorphous segments with robust mechanical properties, which aids in predicting the microstructure–mechanical property relationships in plastics under applied forces. [ABSTRACT FROM AUTHOR]

Published
2024
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88. Enhancing catalytic performance, coke resistance, and stability with strontium-promoted Ni/WO3-ZrO2 catalysts for methane dry reforming.

Author

Elnour, Ahmed Yagoub, Fakeeha, Anis Hamza, Ibrahim, Ahmed Aidid, Osman, Ahmed I., Abasaeed, Ahmed Elhag, Adil, Syed Farooq, Kumar, Rawesh, and Al-Fatesh, Ahmed S.

Subjects
COKE (Coal product), CATALYSTS, CATALYTIC activity, METHANE, RAMAN spectroscopy, CATALYST supports
Abstract

The first step of the DRM reaction is just the decomposition of CH4 into CH4−x (x = 1–4). The next step comprises two steps, namely the oxidation of CH4−x into syngas (by CO2) and the self-polymerization of CH4−x species. The earlier one is known as dry reforming of methane (DRM), and the latter one generates carbon deposits over the catalyst surface. In this study, we investigated the impact of 1–3 wt% Sr over Ni-based catalysts on a ZrO2-WO3 support on the catalytic activity and coke deposit. Various characterization techniques such as thermogravimetric analysis, X-ray diffraction, Raman spectroscopy, temperature-programed oxidation, temperature-programed reduction, and temperature-programed desorption were used to assess the physicochemical properties of the fresh and spent catalysts. The addition of 2wt% Sr promoter significantly improves the catalyst's basicity in strong basic sites region through Sr2+ mediated interaction of CO2 species as well as inhibits the deposition of carbyne type carbon. Enhanced CO2 interaction results into the potential oxidation of carbon deposit and the highest CH4 conversion, reaching 60% up to 470 min TOS at a reaction temperature of 700 ℃. [ABSTRACT FROM AUTHOR]

Published
2024
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