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Related Concept Videos

Adsorption Isotherms I01:29

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...
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Adsorption of Gases on Solids

Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
Adsorption Isotherms II01:25

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
Atomic Force Microscopy01:08

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...

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Atomic and molecular adsorption on RhMn alloy surface: a first principles study.

Xiufang Ma1, Huiqiu Deng, Ming-Mei Yang

  • 1Department of Applied Physics, Hunan University, Changsha 410082, China.

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The RhMn alloy surface modifies atomic and molecular adsorption, with oxygen species preferring Mn sites and others favoring Rh due to ligand effects. This impacts syngas conversion.

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Area of Science:

  • Surface Science
  • Computational Chemistry
  • Materials Science

Background:

  • Alloying transition metal surfaces can alter adsorption properties.
  • Understanding adsorption on RhMn (Rhodium-Manganese) alloy surfaces is crucial for catalysis.

Purpose of the Study:

  • Investigate adsorption energetics and site preferences of various species on RhMn(111).
  • Elucidate electronic and structural factors governing adsorption behavior.
  • Assess implications for syngas (CO+H2) selective conversion.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Analysis of electronic structure and bonding.
  • Thermodynamic stability and segregation studies.

Main Results:

  • Mn segregation to the subsurface is energetically favored, but surface alloy formation occurs due to O-Mn interactions.
  • Oxygen-containing species (O, OH) preferentially adsorb on Mn sites (ensemble effect).
  • Other adsorbates (N2, CH3, CO, NO, H) prefer Rh sites, with enhanced binding due to Mn's ligand effect.

Conclusions:

  • RhMn alloy surfaces exhibit distinct adsorption behaviors compared to pure Rh(111).
  • Adsorption site preferences are governed by a combination of ligand and ensemble effects.
  • Modified adsorption properties on RhMn alloys have significant implications for catalytic applications, particularly syngas conversion.