Unusual coordination behavior Cr(super 3+) in microporous aluminophosphates

Article Abstract:

A CrAPO-5 molecular sieve is investigated with X-ray absorption spectroscopy (EXAFS-XANES) as dehydrated material and after loading with water and ammonia to unravel the coordination geometries of Cr(super 3+) in the framework of a microporous crystalline aluminophosphate, more particularly of the AFI-type. The observation underlines the flexibility of transition metal ions, such as Cr(super 3+), to cope with unusual coordination geometries in inorganic hosts, making them interesting as potential active sites in heterogeneous catalysis.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Aluminum Compounds, Catalysis, Chemical properties, X-ray spectrometry

---

Identification of CO adsorption sites in supported Pt catalysts using high-energy-resolution fluorescence detection X-ray spectroscopy

Article Abstract:

High-energy-resolution fluorescence detection (HERFD) X-ray spectroscopy is described as a new tool for the identification of the bonding sites of reactants in supported metal catalysts. The X-ray absorption spectroscopy (XAS) is element-specific and it can be used under high pressures and temperatures, in situ HERFD XAS can be applied to a swathe of catalytic systems, including alloys.

Industrial Gas Manufacturing, Industrial gases, Carbon Dioxide, Spectra, Absorption spectra

---

Kbeta-detected XANES of framework-substituted FeZSM-5 zeolites

Article Abstract:

A study was conducted, by means of Kbeta-detected X-ray absorption spectroscopy, to examine the valence and local symmetry of iron in framework-substituted FeZSM-5, with a high Fe dilution (Si/Fe = 360). The result reveals that the presence of water at high temperature facilitates the hydrolysis of the Si-O-Fe bonds and increases the formation of extraframework iron species.

Spectroscopy, Chemical bonds, Structure

Similar abstracts:

• Abstracts: A combined experimental and theoretical evaluation of the structure of hydrated microporous aluminophosphate AlPO(sub 4)-18
• Abstracts: Aggregation behavior of fluorooctanols in hydrocarbon solvents. Phase diagrams of mixtures of diastereomeric salts of N-acyl amino acid-type surfactants and separation of enantiomers
• Abstracts: First-principles calculation of the (super 17)O NMR parameters of a calcium aluminosilicate glass. First-principles calculations of (super 17) O, (super 29) Si, and (super 23) Na NMR spectra of sodium silicate crystals and glasses
• Abstracts: Molecular simulation of the free surface order in NLC samples. Role of delocalized electrons in polyaniline nematogen cyanobiphenyls interaction
• Abstracts: Ab initio molecular orbital study on the oxidation mechanism for dimethylamine borane as a reductant for an electroless deposition process

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.