Microporous vanadyl-arsenate with the template incorporated exhibiting sorption and catalytic properties

Berrocal, Teresa; Mesa, José L.; Pizarro, José L.; Bazan, Begoiia; Iglesias, Marta; Aguayo, Andrés T.; Arriortua, Marı́a I.; Rojo, Teófilo

doi:10.1039/b807250g

Cited by 14 publications

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References 16 publications

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“…The mixture, with a pH of 6, was heated up to 100 ºC for three days. After cooling the reaction system to room temperature, a mixture of light blue prismatic crystal and a brown 15 greenish unidentified powder was obtained. The crystals were separated from the powder, washed with water and acetone and dried.…”

Section: Catalytic Activitymentioning

confidence: 99%

“…Experiments in the same reaction conditions without catalyst have been also conducted and no appreciable amount of product was detected. 15 Reaction samples were taken at regular times and analyzed by a Hewlett-Packard 5890 II GC-MS in order to determine the conversion. After the reaction, the catalysts were filtered and characterized by X-ray powder diffraction and IR spectroscopy.…”

Section: Catalytic Activitymentioning

confidence: 99%

“…5 As far as we are concerned, this is the first of catalytic properties of hybrid vanadates. There are some studies of related materials, such as vanadyl arsenates templated with amine molecules 15 or vanadyl phosphates 16 , as well as of vanadium containing metalorganic compounds 17 . Recently, four silver(I) vanadates have also 10 been studied as photocatalysts 18 .…”

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confidence: 99%

“…All of them decompose methylene blue, a organic dye, under ultraviolet and/or visible light. 15 During the course of our study, in order to obtain new hybrid vanadates with catalytic properties, we have synthesized three new vanadates of Co(II), Ni(II) and Cu(II) with 1(2-aminethyl)pyperazonium (HAep+), with formula M(HAep) 2 (VO 3 ) 4 . In this work we report on the crystal structure, 20 thermal behaviour, and spectroscopic properties together with the catalytic activity tests of these phases.…”

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confidence: 99%

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M(C6H16N3)2(VO3)4 as heterogeneous catalysts. Study of three new hybrid vanadates of cobalt(ii), nickel(ii) and copper(ii) with 1-(2-aminoethyl)piperazonium

et al. 2011

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Three new hybrid vanadates have been synthesized under hydrothermal conditions with the formula M(C 6 H 16 N 3 ) 2 (VO 3 ) 4 , where M= Co(II), Ni(II) and Cu(II). The structural analyses show that the phases are isostructural and crystallize in the monoclinic space group P2 1 /c. These compounds show a two-10 dimensional crystal structure, with sheets composed of [VO 3 ]  n n chains and metal centres octahedrically coordinated, chelated by two 1(2-aminoethyl)pyperazonium ligands. The thermal study reveals that copper containing phase is less stable than cobalt and nickel containing ones. The IR spectra of the three phases are very similar, with little differences in the inorganic bond region of the copper containing phase. The UV-visible spectra show that the cobalt(II) and the nickel(II) are in slightly distorted 15 octahedral environments. The catalytic tests show that the phases act as heterogeneous catalysts for the selective oxidization of alkyl aryl sulfides, with both H 2 O 2 and tert-butylhydroperoxide as oxidizing agents. The influence of the steric hindrance in the kinetic profile had been studied. The catalytic reactions induce the partial amorphization of the phases.

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Section: Catalytic Activitymentioning

confidence: 99%

Section: Catalytic Activitymentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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M(C6H16N3)2(VO3)4 as heterogeneous catalysts. Study of three new hybrid vanadates of cobalt(ii), nickel(ii) and copper(ii) with 1-(2-aminoethyl)piperazonium

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“…The use of open framework phases templated with amines as catalysts in these reactions is especially appealing due to their redox properties, including their acidity [22,23,28,29].…”

Section: -Introductionmentioning

confidence: 99%

Vanadyl arsenates as catalysts for selective oxidation of organic sulfides and alkenes

Berrocal

Larrea

Iglesias

et al. 2011

Journal of Molecular Catalysis A: Chemical

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Two vanadyl arsenates templated with ethylendiamonium (EnVAs) and piperazonium (PipVAs) were evaluated as catalysts for the oxidation of thioethers and alkenes, using H 2 O 2 and t-butyl hydroperoxide (TBHP) as oxidants. The intrinsic activity of EnVAs was higher than that of PipVAs for the oxidation of sulfides. Similar results were obtained when using either H 2 O 2 or TBHP as oxidants. However, the sterical effects were enhanced when TBHP was used and higher selectivities towards sulfoxides were achieved with this oxidant. The catalytic activity of the V-based materials in the epoxidation of simple alkenes and allylic alcohols was assessed. Upon reuse, both materials show no significant decrease in their catalytic properties. 1.-INTRODUCTIONOpen-framework metal phosphates are of considerable technological importance as shapeselective catalysts, ion-exchange materials and molecular sieves [1]. Since the discovery of the microporous crystalline aluminophosphates AlPO4-n in 1982[2], a large number of new metal phosphates with open-framework structures have been synthesized [3][4][5][6][7]. These structures contain not only tetrahedrally coordinated atoms but also square pyramidal and octahedral moieties. Among the vast family of open-framework metal phosphates, the transition metal phosphates constitute an important group due to their potential activity as redox catalysts. Out of all the open-framework compounds known, those based on the phosphate oxoanion appear to be the predominant class [8][9][10]. In addition to the use of tetrahedral phosphate groups as building units, other anionic moieties such as borates [11] . In addition, epoxides, produced by the oxidation of olefins, are extremely useful building blocks in the synthesis of organic compounds as they act as excellent intermediates that can yield a great variety of products [27]. When using vanadyl compounds, the catalytically active oxo-peroxo intermediate is formed in situ by oxidation of V(IV) to V(V) with an excess of tert-butyl hydroperoxide, yielding a tert-butyl hydroperoxovanadium(V) complex.In most of the methods described in the literature, pollutants are generated, because of the use of corrosive acids, toxic or dangerous substances [25]. For this reason it is important to develop clean methods which allow obtaining the sulfoxide derivatives and the epoxides without the generation of these undesired substances. In this sense, the use of hydrogen peroxide instead of other oxidants for the oxidation of organic substrates is an interesting alternative because the unique subproduct of the reaction is water. In addition, hydrogen peroxide is highly efficient in its oxygen content and is a cheap reagent. 4The use of open framework phases templated with amines as catalysts in these reactions is especially appealing due to their redox properties, including their acidity [22,23,28,29].During the course of our research, we have synthesized two new catalytic compounds, fluoro- was added dropwise, while the overall suspension was heated at 323...

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ChemInform Abstract: Microporous Vanadyl‐Arsenate with the Template Incorporated Exhibiting Sorption and Catalytic Properties.

et al. 2008

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Vanadium I 5000Microporous Vanadyl-Arsenate with the Template Incorporated Exhibiting Sorption and Catalytic Properties. -(mpipH 2 )[(VO) 3 (AsO 4 )(HAsO 4 ) 2 (OH)]·3H 2 O (mpip: 2-methylpiperazine) is hydrothermally synthesized from a mixture of As2O5, VCl3, mpip, and H2O (autoclave, 443 K, 5 d). The compound crystallizes in the hexagonal space group P63/m with Z = 6 (single crystal XRD) and exhibits channels with a maximum diameter of ca. 14.0 Å. The 2-methylpiperazine template is located inside the channels and near to their walls. The compound shows reversible adsorption and desorption of N2 at 77 K and is an extremely efficient catalyst that catalyzes selective sulfoxide formation from organic sulfides under mild conditions. -(BERROCAL, T.; MESA*, J. L.; PIZARRO, J. L.; BAZAN, B.; IGLESIAS, M.; AGUAYO, A. T.; ARRIORTUA, M. I.; ROJO, T.; Chem.

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Microporous vanadyl-arsenate with the template incorporated exhibiting sorption and catalytic properties

Cited by 14 publications

References 16 publications

M(C6H16N3)2(VO3)4 as heterogeneous catalysts. Study of three new hybrid vanadates of cobalt(ii), nickel(ii) and copper(ii) with 1-(2-aminoethyl)piperazonium

M(C6H16N3)2(VO3)4 as heterogeneous catalysts. Study of three new hybrid vanadates of cobalt(ii), nickel(ii) and copper(ii) with 1-(2-aminoethyl)piperazonium

Vanadyl arsenates as catalysts for selective oxidation of organic sulfides and alkenes

ChemInform Abstract: Microporous Vanadyl‐Arsenate with the Template Incorporated Exhibiting Sorption and Catalytic Properties.

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