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Formation of Sodium Chloride on the Surface of Sulfate-Rich Gobi Desert Salt in Response to Water Adsorption.
ACS EST Air
November 2024
Department of Chemistry and Molecular Biology, Atmospheric Science, University of Gothenburg, SE-41390 Gothenburg, Sweden.
Dust storms in arid regions transport desert salts and dust, affecting geochemical processes, atmospheric chemistry, climate, and human health. This study examines how the gas-salt interface composition of desert salt changes with varying relative humidity (RH), using ambient pressure X-ray photoelectron spectroscopy (APXPS), near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, and molecular dynamics (MD) simulations. Ion chromatography analysis of desert salt indicates it is predominantly composed of sulfate, sodium, and magnesium ions, with traces of calcium, chloride, nitrate, and potassium ions.
View Article and Find Full Text PDFDesign and testing of an (inert) gas cell for in situ polarization modulation infrared reflection absorption spectroscopic (PM-IRRAS) measurements under specific atmospheres.
Rev Sci Instrum
November 2024
Institute for Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany.
Article Synopsis
- IRRAS is an analytical technique used to study molecules adsorbed on metal surfaces, even at low coverage levels.
- A new inert gas cell has been developed to enhance the Bruker PMA50 module, allowing for measurements of thin films in a controlled atmosphere and enabling the transfer of samples into a glovebox.
- The study demonstrates the use of this gas cell to observe the reaction of an air-sensitive molybdenum complex on a gold surface, showing that light exposure accelerates its conversion to a different chemical form.
Role of Metal-Oxide Interfaces in Methanol Decomposition: Reaction of Methanol on CeO/Ag(111) Inverse Model Catalysts.
J Phys Chem Lett
November 2024
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, People's Republic of China.
Article Synopsis
- Metal-oxide interfaces are important for catalytic processes, especially in methanol reactions on the CeO/Ag(111) catalyst surfaces studied under ultrahigh vacuum (UHV) conditions.
- Scanning tunneling microscopy and other techniques revealed that submonolayer CeO films form a hexagonal lattice with fully oxidized cerium, while higher ceria coverages lead to multilayer formations.
- Methanol interacts with these surfaces to create methoxy groups, which can decompose into formate or formaldehyde, with the submonolayer CeO exhibiting significantly lower temperatures for methoxy dehydrogenation compared to multilayer structures, highlighting the unique catalytic properties of the CeO-Ag(111) interface.
Surface science studies of the coverage dependent adsorption of methyl acetate and methyl propanoate on graphite.
RSC Adv
November 2024
Department of Chemistry, University of Sussex Falmer Brighton BN1 9QJ UK
Complex organic molecules (COMs) have been detected in a wide range of astrophysical environments, including the interstellar medium, comets and proto-planetary disks. The icy mantles that form on dust grains in these environments are thought to be the chemical nurseries that allow the formation of many of the COMs that have been identified. As such, the adsorption, thermal processing and desorption of COMs from dust grain surfaces are important in understanding the astrochemical networks as a whole.
View Article and Find Full Text PDFMonolayers of a thiacalix[3]pyridine-supported molybdenum(0) tricarbonyl complex on Au(111): characterisation with surface spectroscopy and scanning tunneling microscopy.
Dalton Trans
November 2024
Institute of Inorganic Chemistry, Christian-Albrechts-University of Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany.
Article Synopsis
- Researchers are developing a new method for creating single-site catalysts by depositing dome-shaped metal-organic complexes on metallic surfaces, combining characteristics of both homogeneous and heterogeneous catalysis.
- A specific molybdenum(0) tricarbonyl complex, supported by thiacalix[3]pyridine, is synthesized and deposited on gold and silver surfaces through vacuum evaporation.
- The study uses surface spectroscopy and STM to show that the complex remains parallel to the surface and exhibits improved stability and lower reactivity towards oxygen compared to a similar complex with an azacalixpyridine ligand.
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