Characterization of iron promoter in tungstated zirconia catalysts by Mossbauer spectroscopy at very low temperatures

Article Abstract:

Mossbauer spectroscopy is used to characterize the tungstated zirconia (WZ) catalyst with iron promoter used for the conversion of n-pentane into isopentane. The analysis has emphasized the importance of recording Mossbauer spectra below liquid helium temperature in Fe promoted catalysts, allowing a more precise identification of the different oligomeric and particulate [Fe.sup.III] species.

Germany, France, Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Zirconium, Chemical properties, Iron catalysts

---

Evidence for the formation of W(super +5) centers and OH groups upon hydrogen reduction of platinum-promoted tungstated zirconia catalysts

Article Abstract:

The redox behavior of platinum(Pt) promoted tungstated zirconia catalysts, which are active in the isomerization of light alkanes is investigated by applying FTIR and EPR techniques. EPR shows evidence of formation of W(super 5+) at reduction temperatures above 473 K for the unpromoted catalyst and room temperature when platinium is present.

Analysis, Isomerization, Electron paramagnetic resonance, Zirconium oxide, Properties

---

Formation of surface carbonyl and nitrosyl complexes on Titania- and zirconia-supported chromia

Article Abstract:

A study is conducted to investigate CO and NO adsorption and coadsorption on Cr/ZrO2 and Cr/TiO2 samples, which are subjected to different reduction/oxidation treatments and to test the applicability of these probe molecules to selective determination of Cr(super n+) and Ti(super 4+)(Zr(super 4+)) sites.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Chromium Compounds, Fourier transform infrared spectroscopy, Atomic properties

Similar abstracts:

• Abstracts: Characterization of porous materials by gas adsorption at ambient temperatures and high pressure. Gas adsorption in active carbons and the silt-pore model 2: Mixture adsorption prediction with DFT and IAST
• Abstracts: Characterization of microporous titanosilicate ETS-10 by infrared spectroscopy with methane as a probe molecule for basic sites
• Abstracts: Determination of micellar microenvironment of pinacyanol by visible spectroscopy. Salt-induced vesicle formation from single anionic surfactant SDBS and its mixture with LSB in aqueous solution
• Abstracts: Optimization of single-walled carbon nanotube arrays for methane torage at room temperature. Dispersion of single-walled carbon nanotubes in aqueous solutions of the anionic surfactant NaDDBS
• Abstracts: Fabrication of sub-10-nm silicon nanowire arrays by size reduction lithography. Optical properties of short range ordered arrays of nanometer gold disks prepared by colloidal lithography

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