Recent (1987‐1993) developments in heteropolyacid catalysts in acid catalyzed reactions and oxidation catalysis

Jansen, Reinier J.; Veldhuizen, H.M. van; Schwegler, M. A.; Bekkum, H. van

doi:10.1002/recl.19941130302

Cited by 95 publications

(37 citation statements)

References 185 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the electrochemical and electrocatalytic properties of the vanadium-substituted polyoxometalates have been much less studied than those of the parent Keggin anions [3,. The replacement of W VI (or Mo VI ) with V V makes it possible to modify the electrochemical properties of the polyoxometalates [32,33]. The order of decreasing oxidizing ability is: V(V) [ Mo(IV) [ W(IV).…”

Section: Introductionmentioning

confidence: 98%

Electrochemical behavior of vanadium-substituted Keggin-type polyoxometalates in aqueous solution

Zhang

O’Halloran

et al. 2008

J Appl Electrochem

View full text Add to dashboard Cite

Cyclic voltammetry was carried out on selected vanadium-substituted Keggin polyoxometalates in aqueous solution with a focus on K 3 H 2 [a-SiVW 11 O 40 ] Á 6H 2 O (SiVW 11 O 40 ) and K 4 H 2 [c(1, 2)-SiV 2 W 10 O 40 ] Á 4H 2 O (SiV 2 W 10 O 40 ). The redox waves of the V-O and W-O framework for both polyanions are pH-and scan ratedependent. The first vanadium-centered wave (V-wave) for SiVW 11 O 40 shows a classical potential shift as a function of acidity at pH \ 3.5, and then becomes pH-independent above this value. Above pH 3.5, the W-centers in SiVW 11 O 40 and SiV 2 W 10 O 40 exhibit efficient electrocatalytic activity towards the reduction of nitrite and hydrogen peroxide while the V-waves also exhibit an electrocatalytic response in nitrite-containing solutions.

show abstract

Section: Introductionmentioning

confidence: 98%

Electrochemical behavior of vanadium-substituted Keggin-type polyoxometalates in aqueous solution

Zhang

O’Halloran

et al. 2008

J Appl Electrochem

View full text Add to dashboard Cite

show abstract

“…The electrochemical character of transition metal substituted polyoxometalates can by widely changed by variation of the sort of the transition atoms, which within POMs being ordered by decreasing oxidation on the following way: V(V) > Mo(VI) > W(VI) [8]. The vanadium substituted polyoxometalates can be formed by the substitution of one or more tungsten(VI) or molybdenum(VI) ions in Keggin-and Dawson-type polyoxometalates by vanadium ions (V), and are promising candidates for electrocatalytic oxidations and reductions [9,10]. Substitution of vanadium into the framework of POM can shift the stability of the saturated species to higher pH, which is important in several catalytic and electrocatalytic processes [11 -19].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Electrochemical Behavior of Vanadium‐Substituted Keggin‐Type Polyoxometalates Multilayer Films on 4‐Aminobenzoic Acid Modified Glassy Carbon Electrodes

Wang

et al. 2008

Electroanalysis

View full text Add to dashboard Cite

) were first successfully immobilized on 4-aminobenzoic acid modified glass carbon electrodes respectively by layer-by-layer assembly with poly (ethylenimine) (PEI) as counterions. The regular growth processes were monitored by cyclic voltammetry (CV), and it was proved that the multilayer films were uniform and stable. The cyclic voltammetry results indicated that the electrochemical behavior of two multilayer films was similar, and their redox couples are pH-and scan rate-dependent. The multilayer films show favorable electrocatalytic active toward the reduction of NO 2 À , IO 3 À and H 2 O 2 .

show abstract

“…[11][12][13][14] Due to their acidic nature, redox properties, catalytic activity, selectivity, thermal resistance, and reusability, heteropoly compounds are useful and versatile catalysts in a number of transformations. [15][16] These interesting compounds generally exhibit higher catalytic activities than conventional catalysts, such as mineral acids, ion-exchange resins, zeolites, etc.…”

Section: Introductionmentioning

confidence: 99%

Efficient Protection of Alcohols with Carboxylic Acids Using a Variety of Heteropolyoxometallates as Catalysts, Studying Effective Reaction Parameters

Tayebee¹,

Cheravi²

2009

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

Esterification is an important class of reactions in the preparation of perfumery and flavor chemicals, wherein homogeneous, solid acidic, and superacidic catalysts are normally used. Now, an efficient and selective protocol for protection of various functionalized alcohols employing carboxylic acids as protecting agents is realized through the catalytic mediation of simple heteropolyoxometallates. In this methodology, water is the only by-product and notably the aspect of effluent treatments does not arise. The advantages include the operational simplicity, recycle ability of the catalyst and mild reaction conditions. The present catalytic system may be a potential candidate not only for laboratory practice but also for commercial applications and offers an environmentally safer alternative to the existing processes.

show abstract

Recent (1987‐1993) developments in heteropolyacid catalysts in acid catalyzed reactions and oxidation catalysis

Cited by 95 publications

References 185 publications

Electrochemical behavior of vanadium-substituted Keggin-type polyoxometalates in aqueous solution

Electrochemical behavior of vanadium-substituted Keggin-type polyoxometalates in aqueous solution

Fabrication and Electrochemical Behavior of Vanadium‐Substituted Keggin‐Type Polyoxometalates Multilayer Films on 4‐Aminobenzoic Acid Modified Glassy Carbon Electrodes

Efficient Protection of Alcohols with Carboxylic Acids Using a Variety of Heteropolyoxometallates as Catalysts, Studying Effective Reaction Parameters

Contact Info

Product

Resources

About