Author
S.A.A. Mansour
Other affiliations: Yahoo!
Bio: S.A.A. Mansour is an academic researcher from Minia University. The author has contributed to research in topics: Thermal decomposition & Differential thermal analysis. The author has an hindex of 17, co-authored 37 publications receiving 749 citations. Previous affiliations of S.A.A. Mansour include Yahoo!.
Papers
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TL;DR: X-ray diffractometry and UV-Vis diffuse reflectance spectroscopy revealed that fluorite-structured CeO 2 crystallites (mean size 22.3 nm) are dispersed on silica surfaces (CeSi) into microcrystallites (11.2-8.1 nm) and dispersed further on alumina surfaces (AleAl) into nanocrystallite ( x monolayers) as discussed by the authors.
80 citations
TL;DR: Pyridine adsorption on ceria surfaces, prepared by thermal decomposition of diammonium hexanitratocerate at 400 °C, was studied by infrared spectroscopy and gravimetric techniques as mentioned in this paper.
64 citations
TL;DR: In this paper, NH4MnO4, Mn3O4 and Mn(NO3)2·6H2O were used as precursor compounds for the thermal genesis (at 150-600°C) of manganese oxides.
50 citations
TL;DR: In this paper, the surface acidity of the supported catalysts exposed strong different Lewis acid sites was studied by IR spectroscopy of adsorbed pyridine at different temperatures (300, 370, 470 and 570 K).
42 citations
TL;DR: In this article, the thermal decomposition of calcium citrate tetrahydrate in dynamic air or dry nitrogen has been studied thoroughly and the results show that Ca3(C6H5O7)2·4H2O dehydrates in two successive steps at 60-140°C and 140-190°C each involving release of two moles of water.
41 citations
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TL;DR: It is concluded that a discussion of the superior catalytic OER activity of Ni-FeOOH electrocatalysts in terms of surface catalysis and redox-inactive metal sites likely represents an oversimplification that fails to capture essential aspects of the synergisms at highly active Ni- Fe sites.
Abstract: Mixed Ni–Fe oxides are attractive anode catalysts for efficient water splitting in solar fuels reactors. Because of conflicting past reports, the catalytically active metal redox state of the catalyst has remained under debate. Here, we report an in operando quantitative deconvolution of the charge injected into the nanostructured Ni–Fe oxyhydroxide OER catalysts or into reaction product molecules. To achieve this, we explore the oxygen evolution reaction dynamics and the individual faradaic charge efficiencies using operando differential electrochemical mass spectrometry (DEMS). We further use X-ray absorption spectroscopy (XAS) under OER conditions at the Ni and Fe K-edges of the electrocatalysts to evaluate oxidation states and local atomic structure motifs. DEMS and XAS data consistently reveal that up to 75% of the Ni centers increase their oxidation state from +2 to +3, while up to 25% arrive in the +4 state for the NiOOH catalyst under OER catalysis. The Fe centers consistently remain in the +3 sta...
823 citations
TL;DR: In this article, the surface properties of high surface area ceria samples, either in the reduced or unreduced state, have been investigated using FT-IR spectroscopy.
755 citations
TL;DR: This work focuses on the surface chemistry and spectroscopy of chromium in inorganic oxides and the mechanics of hydrogenation-dehydrogenation reactions.
Abstract: Focuses on the surface chemistry and spectroscopy of chromium in inorganic oxides. Characterization of the molecular structures of chromium; Mechanics of hydrogenation-dehydrogenation reactions; Mobility and reactivity on oxidic surfaces.
728 citations
TL;DR: In this article, in situ FTIR spectra of py adsorbed at room (RT) and higher temperature regimes were measured, and compared with RT-spectra of liquid and gas phase Py obtained under identical spectroscopic conditions.
472 citations
TL;DR: In this paper, the textural and structural properties of catalysts and supports were studied in their calcined, reduced and used state by N 2 adsorption-desorption, XRD, UV-vis DRS, TPR, SEM-EDS and TPH.
Abstract: Nickel catalysts supported on binary CeO 2 –ZrO 2 carriers (28–100% CeO 2 molar content) were prepared and evaluated regarding their catalytic performance for the CO 2 reforming of CH 4 (Dry Reforming of Methane, DRM). The textural and structural properties of catalysts and supports were studied in their calcined, reduced and used state by N 2 adsorption–desorption, XRD, UV–vis DRS, TPR, SEM–EDS and TPH. Zirconium improves the textural properties of the CeO 2 –ZrO 2 supports and the corresponding catalysts and enhances their textural stability under thermal reductive treatment. XRD analysis shows the formation of Ce x Zr 1− x O 2 solid solution for all Ce/(Ce + Zr) ratios. Considerable alterations in the electronic environment of the cations and increased lattice defects in the binary solid solutions were detected by UV–vis DR spectroscopy. A significant increase in the reducibility of both supports and catalysts is observed in the presence of Zr. Compared to the zirconia-free sample, the Ni/CeO 2 -ZrO 2 catalysts exhibited much higher activity for the title reaction, accredited to the increase of the surface concentration of the active sites. However, the amount of carbonaceous deposits is not straightforward related to the activity but depends on the Ce/Zr ratio. Among the zirconium containing catalysts, the zirconium-rich one exhibited the higher activity and the stronger resistance to the formation of carbonaceous deposits.
366 citations