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Ali Y.Z. Myhoub

Bio: Ali Y.Z. Myhoub is an academic researcher from Minia University. The author has contributed to research in topics: Oxalate & Oxide. The author has an hindex of 1, co-authored 1 publications receiving 34 citations.

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TL;DR: In this article, the authors used IR-spectroscopy, X-ray diffraction, and scanning electron microscopy (SEM) to characterize the formation of Sm2O3.

36 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the synthesis of nanorods consists of two steps of growth: (i) the nanoparticles were formed at relatively low temperature (120-140 °C) by Ostwald ripening and (ii) were followed by oriented attachment of these nanoparticles at higher temperature (160-200 °C).
Abstract: Monodisperse samaria nanospheres and nanorods have been synthesized from commercial bulk Sm 2 O 3 powders and various capping long-chain alkyl acids (e.g., oleic acid, myristic acid, decanoic acid). The synthesized materials were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform IR, thermogravimetric analysis, and N 2 adsorption/desorption isotherms was employed to characterize these materials. The results revealed that the synthesis of nanorods consists of two steps of growth: (i) the nanoparticles were formed at relatively low temperature (120-140 °C) by Ostwald ripening and (ii) were followed by oriented attachment of these nanoparticles at higher temperature (160-200 °C) to produce the nanorods (average size of 7 nm x 160 nm). Furthermore, the width of nanorods can be controlled by the length of capping alkyl chain agents; on the basis of the experimental results, it seems that a longer alkyl chain agent leads to thinner nanorods; however, the length of nanorods remains unchanged. For the whole process, the possible Ostwald ripening and oriented attachment mechanisms were also discussed. The XPS results for the calcined nanorods sample shows the presence of two oxidation states, Sm 3+ /Sm 2+ (it is found to be 40% Sm 2+ ), and three components by deconvolution of O Is peak indicating the defected structure. The surface chemical composition is found to be Sm 2 O 3-x (x = 1.8). We believe that this synthetic method is simple, highly reproducible, inexpensive, and applicable for large-scale production.

156 citations

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrated the possibility of synthesizing Sm2O3 nano-scaled particles as small as 21.9 ± 5nm using an entirely new green process.

108 citations

Journal ArticleDOI
TL;DR: In this article, the authors used oxalic acid to extract value added products of samarium and cobalt from the waste SmCo magnet by leaching and solvent extraction and established a mechanism of leaching by studying the kinetics and characterization of leached residue.

50 citations

Journal ArticleDOI
Xianglan Xu1, Hong Han1, Jianjun Liu1, Wenming Liu1, Wenlong Li1, Xiang Wang1 
TL;DR: In this article, a series of Co3O4 spinel catalysts modified by Sm were prepared by co-precipitation method and tested for CH4 and CO oxidation.

38 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the optimum conditions of variables such as CH4 partial pressure, CO2 partial pressure and reaction temperature that will maximize syngas yields from methane dry reforming over samarium oxide supported cobalt (Co/Sm2O3) catalyst.
Abstract: The reforming of methane by carbon dioxide for the production of syngas is a potential technological route for the mitigation of greenhouse gases. However, the process is highly endothermic and often accompanied by catalyst deactivation from sintering and carbon deposition. Besides, the applications of dissimilar catalytic systems in methane dry reforming have made it difficult to obtain generalized optimum conditions for the desired products. Hence, optimization studies of any catalytic system often resulted in a unique optimum condition. The present study aimed to investigate optimum conditions of variables such as methane (CH4) partial pressure, carbon dioxide (CO2) partial pressure and reaction temperature that will maximize syngas yields from methane dry reforming over samarium oxide supported cobalt (Co/Sm2O3) catalyst. The Co/Sm2O3 catalyst was synthesized using wet-impregnation method and characterized by thermogravimetric analysis), field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray powder diffraction and nitrogen (N2) physisorption. Syngas production by methane dry reforming over the synthesized Co/Sm2O3 catalyst was investigated in a stainless steel fixed-bed reactor. The process variables (CH4 partial pressure, CO2 partial pressure and reaction temperature) for the syngas production were optimized using response surface methodology (RSM). The RSM and artificial neural networks (ANNs) were used to predict the syngas production from the experimental data. The comparative analysis between the two models showed that the ANN model has better prediction of the syngas yields compared to the RSM model as evident from the good agreement between the observed and the predicted values. At maximum desirability value of 0.97, optimum CH4 and CO2 partial pressures of 47.9 and 48.9 kPa were obtained at reaction temperature of 735 °C resulting in syngas yield of ~79.4 and 79.0% for hydrogen (H2) and carbon monoxide (CO), respectively.

35 citations