"Using intense beams of light, provided by synchrotron radiation sources, we are able to understand the complex properties of catalysts, which are fundamental to the chemical industry and a sustainable future"

Dr. Khaled Mohammed joined Sohag University in February 2015 as a Lecturer in Physical Chemistry and a member of Applied Materials Science (AMS) Lab. Before for taking up this role, Dr. Khaled worked for the University College London (UCL), UK, and was based full time at the Research Complex at Harwell (RCaH), UK, as a Research Associate (November 2013 - October 2015) designing active sites for catalysis in the "Catalyst Design theme", funded by the EPSRC UK Catalysis Hub, UK, and working with Prof. C. Richard A. Catlow's research group. Prior to this, Dr. Khaled awarded his PhD in the Preparation and Characterization of some Nano-Structured Materials for Low-Temperature Oxidation of Carbon Monoxide, (University of Southampton Award, 2014), under the supervision of Prof. John Evans, School of Chemistry, University of Southampton, UK.

Dr. Khaled's research focuses on controlled catalyst preparation methods, in situ characterization and activity testing under operating conditions, which are essential tools in understanding the complex nature of catalysts under real conditions with a particular emphasis on synchrotron radiation-based facilities (particularly in using time resolved, in situ, combined XANES and EXAFS techniques).

ORCID: orcid.org/0000-0002-9538-0936

• Publications

Elucidating the role of CO2 in the soft oxidative dehydrogenation of propane over ceria-based catalysts

2018-11-01 02:28:41 | Keywords Reverse water gas shift, Propene, Propane, Oxidative dehydrogenation, CO2, CeO2,

A mixed oxide support containing Ce, Zr, and Al was synthesized using a physical grinding method and applied in the oxidative dehydrogenation of propane using CO2 as the oxidant. The activity of the support was compared with that of fully formulated catalysts containing palladium. The Pd/CeZrAlO_x_ material exhibited long-term stability and selectivity to propene (during continuous operation for 140 h), ... Read more

High surface area nanostructured activated carbons derived from sustainable sorghum stalk

2018-11-01 02:34:12 | Keywords Purification, Environmental, Nanoporous, Biomass, Activated carbon, Adsorption,

The Durra (Sorghum) stalk was employed as a novel precursor for the formation of high surface area activated carbons (ACs) by utilizing ZnCl2 as activating agent followed by pyrolysis in a flow ofN2 gas. The formation of ACs has been investigated at different pyrolysis temperatures (400, 500 and 600 °C) and different ZnCl2 impreg- nation concentrations. The results indicated that, ... Read more

A flexible gas flow reaction cell for in situ x-ray absorption spectroscopy studies

2018-11-01 02:41:42 | Keywords Micro-reactor, Operating conditions, Time resolved, In situ, Operando, Combined XAFS-XRD, Combined XAFS-MS, EXAFS, XANNES, X-ray absorption spectroscopy,

A capillary-based sample environment with hot air blower and integrated gas system was developed at Diamond to conduct X-ray absorption spectroscopy (XAS) studies of materials under time-resolved, _in situ_ conditions. The use of a hot air blower, operating in the temperature range of 298-1173 K, allows introduction of other techniques e.g. X-ray diffraction (XRD), Raman spectroscopy for combined techniques studies. ... Read more

Design and control of Lewis acid sites in Sn-substituted microporous architectures

2018-11-01 02:47:53 | Keywords DRIFTS, Solid state DR UV/Vis, Solid state NMR, Lewis active sites, Designing active sites, EXAFS, XRD, DFT Calculations,

Monometallic and bimetallic tin-containing framework architectures have been prepared by hydrothermal methods. Structural and spectroscopic techniques were used to probe the nature of the solid-acid sites, at the molecular level, using a combination of XRD, DR UV-Vis, solid state MAS NMR (119Sn, 27Al and 31P) and XAFS. The nature and strength of the solid-acid sites were experimentally probed by FT-IR ... Read more

In situ spectroscopic investigations of MoOx/Fe2O3 catalysts for the selective oxidation of methanol

2018-11-01 02:56:32 | Keywords Advanced spectroscopy, MoOx/Fe2O3, Methanol oxidation, DRIFTS, In situ, EXAFS,

Multicomponent oxide shell@core catalysts have been prepared, affording overlayers of MoO_x_ on Fe2O3. This design approach allows bulk characterization techniques, such as X-ray Absorption Fine Structure (XAFS), to provide surface sensitive information. Coupling this approach with _in situ_ methodologies provides insights during crucial catalytic processes. Calcination studies were followed by a combination of XAFS and Raman, and demonstrate that amorphous ... Read more

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