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  1. Article ; Online: In Situ IR Studies on the Mechanism of Dimethyl Carbonate Synthesis from Methanol and Carbon Dioxide

    Khalid A. Almusaiteer / Sulaiman I. Al-Mayman / Aghaddin Mamedov / Yousef S. Al-Zeghayer

    Catalysts, Vol 11, Iss 517, p

    2021  Volume 517

    Abstract: ... investigated over 5% Rh/Al 2 O 3 catalyst. Diffuse Reflectance Infrared Fourier Transfer Spectroscopy (DRIFTS ... formation. Formation of DMC involves parallel routes comprising interaction of the OH group of Al 2 O 3 ... determines the performance of the 5% Rh/Al 2 O 3 catalyst. Further improvement of catalyst performance ...

    Abstract The synthesis of dimethyl carbonate (DMC) from methanol and Carbon dioxide (CO 2 ) has been investigated over 5% Rh/Al 2 O 3 catalyst. Diffuse Reflectance Infrared Fourier Transfer Spectroscopy (DRIFTS) was used to probe the reaction adsorbates which showed that activation of methanol and CO 2 involves generation of intermediate methoxy species and formate ingredients, participating in elementary steps of DMC formation. Formation of DMC involves parallel routes comprising interaction of the OH group of Al 2 O 3 through an acid/base mechanism and formate pathway with participation of metal sites. DMC in acid/base pathway is formed via methoxy species to form methoxy carbonate (CH 3 O)CO 2 (active adsorbate), which then reacts with the methyl species to form DMC. The pathway involving metal Rh sites generates an additional elementary step for the involvement of CO 2 in the reaction through active formate species. The synergy of parallel pathways determines the performance of the 5% Rh/Al 2 O 3 catalyst. Further improvement of catalyst performance should be based on such a feature of the reaction mechanism.
    Keywords DMC ; CO 2 ; DRIFTS ; methanol ; catalyst ; DME ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
    Subject code 540
    Language English
    Publishing date 2021-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Effect of Incorporated ZnO Nanoparticles on the Corrosion Performance of SiO

    Abdus Samad, Ubair / Alam, Mohammad Asif / Anis, Arfat / Sherif, El-Sayed M / Al-Mayman, Sulaiman I / Al-Zahrani, Saeed M

    Materials (Basel, Switzerland)

    2020  Volume 13, Issue 17

    Abstract: This paper presents the studies of the development of a high-performance epoxy coating for steel substrates. To this end, it investigated the synergistic effect of incorporating zinc oxide (ZnO) nanoparticles into nanosilica containing epoxy formulations. ...

    Abstract This paper presents the studies of the development of a high-performance epoxy coating for steel substrates. To this end, it investigated the synergistic effect of incorporating zinc oxide (ZnO) nanoparticles into nanosilica containing epoxy formulations. The mechanical properties of the epoxy coating formulations were improved by modifying the surfaces of the silica nanoparticles (5 wt.%) with 3-glycidoxypropyl trimethoxysilane, which ensured their dispersal through the material. Next, the ZnO nanoparticles (1, 2, or 3 wt.%) were incorporated to improve the corrosion performance of the formulations. The anticorrosive properties of the coatings were examined by electrochemical impedance spectroscopy (EIS) of coated mild steel specimens immersed in 3.5% NaCl solution over different time intervals (1 h to 30 days). Incorporation of the ZnO nanoparticles and the nanosilica into the coating formulation improved the corrosion resistance of the epoxy coating even after long-term exposure to saline test solutions. Finally, to evaluate how the nanoparticles affected the chemical and morphological properties of the prepared coatings, the coatings were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD).
    Language English
    Publishing date 2020-08-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma13173767
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Treatment of fly ash from power plants using thermal plasma.

    Al-Mayman, Sulaiman / AlShunaifi, Ibrahim / Albeladi, Abdullah / Ghiloufi, Imed / Binjuwair, Saud

    Beilstein journal of nanotechnology

    2017  Volume 8, Page(s) 1043–1048

    Abstract: Fly ash from power plants is very toxic because it contains heavy metals. In this study fly ash was treated with a thermal plasma. Before their treatment, the fly ash was analyzed by many technics such as X-ray fluorescence, CHN elemental analysis, ... ...

    Abstract Fly ash from power plants is very toxic because it contains heavy metals. In this study fly ash was treated with a thermal plasma. Before their treatment, the fly ash was analyzed by many technics such as X-ray fluorescence, CHN elemental analysis, inductively coupled plasma atomic emission spectroscopy and scanning electron microscopy. With these technics, the composition, the chemical and physical proprieties of fly ash are determined. The results obtained by these analysis show that fly ash is mainly composed of carbon, and it contains also sulfur and metals such as V, Ca, Mg, Na, Fe, Ni, and Rh. The scanning electron microscopy analysis shows that fly ash particles are porous and have very irregular shapes with particle sizes of 20-50 μm. The treatment of fly ash was carried out in a plasma reactor and in two steps. In the first step, fly ash was treated in a pyrolysis/combustion plasma system to reduce the fraction of carbon. In the second step, the product obtained by the combustion of fly ash was vitrified in a plasma furnace. The leaching results show that the fly ash was detoxified by plasma vitrification and the produced slag is amorphous and glassy.
    Language English
    Publishing date 2017-05-11
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2583584-1
    ISSN 2190-4286
    ISSN 2190-4286
    DOI 10.3762/bjnano.8.105
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Treatment of fly ash from power plants using thermal plasma

    Sulaiman Al-Mayman / Ibrahim AlShunaifi / Abdullah Albeladi / Imed Ghiloufi / Saud Binjuwair

    Beilstein Journal of Nanotechnology, Vol 8, Iss 1, Pp 1043-

    2017  Volume 1048

    Abstract: Fly ash from power plants is very toxic because it contains heavy metals. In this study fly ash was treated with a thermal plasma. Before their treatment, the fly ash was analyzed by many technics such as X-ray fluorescence, CHN elemental analysis, ... ...

    Abstract Fly ash from power plants is very toxic because it contains heavy metals. In this study fly ash was treated with a thermal plasma. Before their treatment, the fly ash was analyzed by many technics such as X-ray fluorescence, CHN elemental analysis, inductively coupled plasma atomic emission spectroscopy and scanning electron microscopy. With these technics, the composition, the chemical and physical proprieties of fly ash are determined. The results obtained by these analysis show that fly ash is mainly composed of carbon, and it contains also sulfur and metals such as V, Ca, Mg, Na, Fe, Ni, and Rh. The scanning electron microscopy analysis shows that fly ash particles are porous and have very irregular shapes with particle sizes of 20–50 μm. The treatment of fly ash was carried out in a plasma reactor and in two steps. In the first step, fly ash was treated in a pyrolysis/combustion plasma system to reduce the fraction of carbon. In the second step, the product obtained by the combustion of fly ash was vitrified in a plasma furnace. The leaching results show that the fly ash was detoxified by plasma vitrification and the produced slag is amorphous and glassy.
    Keywords fly ash ; power plant ; stabilization/solidification ; surface characterization ; thermal plasma ; Technology ; T ; Chemical technology ; TP1-1185 ; Science ; Q ; Physics ; QC1-999
    Subject code 660
    Language English
    Publishing date 2017-05-01T00:00:00Z
    Publisher Beilstein-Institut
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

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