Supported vanadium oxide catalysts: quantitative spectroscopy, preferential adsorption of V4+/5+, and Al2O3 coating of zeolite Y

Article Abstract:

Diffuse reflectance spectroscopy and electron spin resonance spectroscopy were used in determining the amount of V4+ and V5+ ions in vanadium oxide catalysts. These catalysts have been prepared by the incipient wetness method. The preferential adsorption of both types of ions on SiO2, Al2O3 and USY has also been investigated. Results indicate the presence of V4+ ions on SiO2, Al2O3 and USY surfaces as distorted octahedral species. The supported V5+ species are always in tetrahedral coordination. Both types of ions are preferentially adsorbed on Al2O3 and are mobile on hydrated surfaces.

Catalysts, Vanadium, Adsorption

---

Relating structure and chemical composition with lewis acidity in zeolites: a spectroscopic study with probe molecules

Article Abstract:

The experiments were done where spectroscopic studies were performed on the Lewis acid sites in FAU and MFI zeolites with different nonframework Al content. The results show that the frequency shifts and the relative intensities of these peaks were correlated with the structure type and the nonframework Al amount.

Binding sites (Biochemistry), Active sites (Biochemistry), Atomic properties

---

Reactivity descriptors and rate constants for acid zeolite catalyzed ethylation and isopropylation of benzene

Article Abstract:

The acid zeolite catalyzed and isopropylation of benzene with ethene and propene is investigated at the B3LYP/6-31G* level of calculation with T4-cluster representing the bronsted acid site of the zeolite. Transition structures, and products, a kinetic and a sensitivity analysis were used to model the reactions.

Chemical properties, Transition state (Chemistry)

Similar abstracts:

• Abstracts: Laplacian of the electronic charge density and heat of adsorption of O2 and CO molecules on 3d transition metals
• Abstracts: Combined theoretical and FTIR spectroscopic studies on hydrogen adsorption on the zeolites Na-FER ad K-FER. Experimental and quantum chemical studies on the adsorption of carbon dioxide on alkali-metal-exchanged ZSM-5 zeolites
• Abstracts: Effects of precursor and support variation in the genesis of uranium oxide catalysts for CO oxidation and selective reduction of NO: Synthesis and characterization
• Abstracts: Interfacial electron transfer between the photoexcited porphyrin molecule and TiO2 nanoparticles: Effect of catecholate binding
• Abstracts: Zirconia-supported MoO (sub x) catalysts for the selective oxidation of dimethyl ether to formaldehyde : structure, redox properties, and reaction pathways

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