Studies on crystalline microporous vanadium silicates

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1272· OSTI ID:5548437

Reddy, K R; Ramaswamy, A V; Ratnasamy, P ^[1]

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1. National Chemical Lab., Pune (India)

The synthesis and catalytic properties of V-NCL-1, a novel vanadium silicate, large-pore molecular sieve in various oxidation reactions, are described. The reactions include the oxidation of n-octane, cyclohexane, toluene, trimethylbenzenes, and naphthalene. In the as-synthesized form, most of the vanadium in V-NCL-1 is present as atomically dispersed and isolated V[sup 4+] located in framework positions, though not necessarily in tetrahedral coordination. On calcination in air, the vanadium ions are oxidized to the pentavalent state. In addition, part of the vanadium leaves lattice locations and forms nonframework clusters. When the oxidized sample is reduced, V[sup 4+] ions are formed again. The three-dimensional silicate structure of the molecular sieve is intact during all these treatments. Due to the presence of large pores, V-NCL-1 is able to oxidize bulky molecules such as mesitylene and naphthalene. Unlike their titanium analogs, vanadium silicates are able to oxyfunctionalize the primary carbon atoms in alkanes and the side chains in alkylaromatics. 18 refs., 7 figs., 9 tabs.

• OSTI ID: 5548437
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 143:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORBENTS
ALKANES
ALKYLATED AROMATICS
AROMATICS
CATALYTIC EFFECTS
CATIONS
CHARGE STATES
CHARGED PARTICLES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRYSTALS
CYCLOALKANES
CYCLOHEXANE
HYDROAROMATICS
HYDROCARBONS
IONS
MATERIALS
MOLECULAR SIEVES
OCTANE
ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
POROUS MATERIALS
SILICATES
SILICON COMPOUNDS
SYNTHESIS
TOLUENE
TRANSITION ELEMENT COMPOUNDS
VALENCE
VANADIUM COMPOUNDS
VANADIUM SILICATES