Cobalt phthalocyanine encapsulated in Y zeolite: a physicochemical study

Páez‐Mozo, Edgar A.; Delmon, Bernard; Gabriunas, N.; Lucaccioni, Fabio; Acosta, D.; Patrono, P.; Laginestra, A.; Ruíz, Patricio

doi:10.1021/j100151a031

Cited by 56 publications

(23 citation statements)

References 2 publications

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“…Evidence for the presence of surface nitrogen (N1s peak, see Fig. 9b) is a single peak centered at 399.0 eV, in agreement with the literature [68][69][70]; there is little separation (e.g., 0.28 eV as a shift in Pb-Pc [71]) between the four equivalent aza-type nitrogens and four equivalent pyrrole-type nitrogens (for both Co-and Cu-Pc). The decrease in surface nitrogen content with HTT is consistent with the disappearance of the C1s peak at 285.7 eV (attributed to carbon-nitrogen bonding, as mentioned above) and is practically undetected at 850°C and above.…”

Section: Effect Of Httsupporting

confidence: 89%

“…The peak corresponding to Co 2p 3/2 (Fig. 9c) in as-received Co-Pc occurs at 781.3 eV and its intensity decreases with HTT without appreciable change in its binding energy (781.2 eV at both 550 and 700°C) which is 0.7 eV higher than that reported [69] for Co-N in phthalocyanines but is considered to be an acceptable result since metallic and oxidized cobalt should appear below this energy [69,72]. At 850°C and above, Co 2p 3/2 is no longer detectable: this is interpreted as evidence of metal sintering and encapsulation of metal particles by the growing carbon layers [11,16].…”

Section: Effect Of Httmentioning

confidence: 56%

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Pyrolyzed phthalocyanines as surrogate carbon catalysts: Initial insights into oxygen-transfer mechanisms

Vallejos-Burgos

Utsumi

Hattori

et al. 2012

Fuel

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a b s t r a c tDeposited and heat-treated phthalocyanines are promising electrocatalysts for replacing platinum in the oxygen reduction reaction (ORR), the most important process in energy conversion systems such as fuel cells; and yet its key mechanistic features are not well understood. To optimize their use, it is necessary to understand their behavior in the absence of an electric field. In the pursuit of this goal, we pyrolyzed metal-free, cobalt and copper phthalocyanines between 550 and 1000°C and studied their structural and chemical changes by elemental analysis, N 2 and CO 2 adsorption, X-ray diffraction (XRD), Raman spectroscopy, X-ray analysis fine structure (XAFS) and X-ray photoelectron spectroscopy (XPS). Their catalytic activity was assessed by non-isothermal O 2 gasification and NO reduction reactions. A comparison of these results with their other properties allowed us to reach the following conclusions: (i) the loss of reactivity of metal-free phthalocyanine with heat treatment is attributed to its structural annealing and heteroatom loss, with the porosity changes having no effect; (ii) for metal phthalocyanines at intermediate heat treatment temperatures, the optimum in reactivity correlates with the micropore surface area and the presence of metal particles, with no influence of nitrogen content; (iii) the coordination metal increases phthalocyanine thermal stability in an inert atmosphere, but in an oxidizing atmosphere it acts as a gasification catalyst even below decomposition temperatures. The implications of these findings for catalytic oxygen-transfer mechanisms are discussed.

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Section: Effect Of Httsupporting

confidence: 89%

Section: Effect Of Httmentioning

confidence: 56%

Pyrolyzed phthalocyanines as surrogate carbon catalysts: Initial insights into oxygen-transfer mechanisms

Vallejos-Burgos

Utsumi

Hattori

et al. 2012

Fuel

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“…II phthalocyanine and the value of 779.8 eV for Co II porphyrin, [20] and was attributed to Co 3 + . Furthermore, the Co 2p region did not show a satellite due to Co 2+ , as in CoO.…”

Section: Ev For Comentioning

confidence: 99%

Synthesis of Transition Metal‐Modified Carbon Nitride Polymers for Selective Hydrocarbon Oxidation

Ding¹,

Chen²,

Antonietti³

et al. 2010

ChemSusChem

374

172

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Modification of graphitic carbon nitride (g-C(3)N(4)) photocatalyst with transition metals was achieved with a simple soft-chemical approach using dicyandiamide monomer and metal chloride as precursors, in combination with a thermal-induced polycondensation at 600 °C under nitrogen atmosphere. The resultant organic-inorganic hybrid materials were thoroughly characterized by a variety of techniques, including X-ray diffraction (XRD), UV/Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), N(2)-sorption, transmission electron microscopy (TEM), photoluminescence (PL), and FTIR. Benzene hydroxylation and styrene epoxidation reactions were employed to evaluate the catalytic/photocatalytic activity of the synthesized g-C(3)N(4)-based catalysts. Results showed that Fe- and Cu-modified g-C(3)N(4) were active for the hydroxylation of benzene to phenol using H(2)O(2) under mild conditions. It was also found that g-C(3)N(4) could promote the catalytic epoxidation of styrene using molecular oxygen as the primary oxidant; after modification with Co and Fe, the catalytic performance for styrene epoxidation with O(2) could be significantly improved, especially when coupled with visible-light irradiation.

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“…The method was first described by Romanowski and coworkers [44][45][46], and its principle is depicted in Fig 3. It involves the introduction of the metal via ion exchange or preadsorption of a labile metal complex, such as a carbonyl or a metallocene, followed by reaction with 1,2dicyanobenzene at temperatures from 250 • C to 350 • C. This synthesis principle was later adopted by others to prepare phthalocyanine complexes of, for example, cobalt [47][48][49][50], copper [48,51], iron [52][53][54][55], manganese [56], nickel [47,57], osmium [57], rhodium [58], and ruthenium [57] in the large cavities of faujasite, EMC-2 (EMT) [59] and in the aluminophosphate VPI-5 [56,60]. The method was first described by Romanowski and coworkers [44][45][46], and its principle is depicted in Fig 3. It involves the introduction of the metal via ion exchange or preadsorption of a labile metal complex, such as a carbonyl or a metallocene, followed by reaction with 1,2dicyanobenzene at temperatures from 250 • C to 350 • C. This synthesis principle was later adopted by others to prepare phthalocyanine complexes of, for example, cobalt [47][48][49][50], copper [48,51], iron [52][53][54][55], manganese [56], nickel [47,57], osmium …”

Section: 2 Ship-in-the-bottle Methodsmentioning

confidence: 99%

Zeolite‐Entrapped Metal Complexes

Ernst

2008

Handbook of Heterogeneous Catalysis

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IntroductionSince the publication of the first edition of this Handbook [1], knowledge concerning the preparation of zeolite-entrapped metal complexes, the methods for their characterization, and their application in catalytic transformations have been gradually extended. In particular, whilst the examples of catalytic applications of these host/guest compounds have considerably broadened, the principally available methods for their preparation and characterization have been extended only in an ''evolutionary'' manner. Thus, the first two sections of this chapter, which describe the synthesis and characterization of zeolite-encaged metal complexes, have been only slightly modified and/or extended, and more recent references have been added. Overall, the subject matter of this chapter is restricted to physically entrapped complexes, while immobilization by anchoring or grafting is detailed in Chapters 2.4.5 and 2.4.9 of this Handbook. The third section of the chapter, which describes catalysis by zeoliteentrapped transition metal complexes, has been extended and updated in order to cover more recent developments in the field. Synthesis of Zeolite-Entrapped Metal ComplexesA variety of monodentate as well as bidentate and polydentate ligands has been used for the preparation of transition metal complexes in zeolites. The early studies on monodentate-based complexes were originally extensively reviewed by Lunsford [2, 3] and later updated by Mortier and Schoonheydt [4] and by Ozin and Gil [5]. The present chapter will, therefore, focus on the preparation of zeolite-entrapped transition metal complexes with bidentate and polydentate ligands.Until about 1996, only relatively few bidentate and polydentate ligands had been investigated for the synthesis of transition metal complexes in zeolites. These included ethylenediamine, tetraethylenepentamine, dimethylglyoxime, phenanthroline, bi-and terpyridine, various Schiff bases, phthalocyanines, and porphyrins. From a catalytic point of view, * Corresponding author.

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Cobalt phthalocyanine encapsulated in Y zeolite: a physicochemical study

Cited by 56 publications

References 2 publications

Pyrolyzed phthalocyanines as surrogate carbon catalysts: Initial insights into oxygen-transfer mechanisms

Pyrolyzed phthalocyanines as surrogate carbon catalysts: Initial insights into oxygen-transfer mechanisms

Synthesis of Transition Metal‐Modified Carbon Nitride Polymers for Selective Hydrocarbon Oxidation

Zeolite‐Entrapped Metal Complexes

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