Zeolite encapsulated Pd(salen), a selective hydrogenation catalyst

Kowalak, S.; Weiss, R. C.; Balkus, Kenneth J.

doi:10.1039/c39910000057

Cited by 93 publications

(29 citation statements)

References 2 publications

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“…Numerous studies have been conducted on encapsulation of a variety of metal complexes [14,15], clusters [16,17] and organometallic compounds [9,18] in zeolitic hosts. Intensive studies have been considered to improve the catalytic properties for these materials in the oxidation of different types of organic substrates using alternative oxidation processes based on green and non-toxic oxidants.…”

Section: Introductionmentioning

confidence: 99%

“…It is observed that they cannot only retain their high activity and selectivity in homogeneous catalysis but also exhibit high stability. This is due to the reduction of degradation of the organic ligands and dimerization of the transition metal complexes in cavities [8][9][10][11][12][13], which could occur during homogeneous catalytic reactions, resulting in a reduction in the activity, and even irreversible deactivation.…”

Section: Introductionmentioning

confidence: 99%

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Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

Abbo

Titinchi

2010

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Chromium(III), zinc(II) and nickel(II) complexes of thio-Schiff base derived from salicylaldehyde and 4-amino-2,4-dihydro-1,2,4-triazole-5-thione have been encapsulated in the nanopores of zeolite-Y by a flexible ligand method. The prepared encapsulated metal complexes have been characterized by surface analysis (XRD and N 2 adsorption/desorption), spectroscopic methods, chemical and thermal analyses. The various techniques of characterization used demonstrated that these complexes were effectively encapsulated in the zeolite supercages without structural modification or loss of crystallinity of the zeolite framework. The encapsulated complexes were screened as heterogeneous catalysts for various oxidation reactions such as phenol, cyclohexene and styrene oxidation, using H 2 O 2 as an oxidant. Under the optimized conditions, these catalysts exhibited high to moderate activity. After a few cycles these catalysts were found to be stable and could be reused after recovering without detectable catalyst leaching or significant loss of activity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

Abbo

Titinchi

2010

Top Catal

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“…The electronic spectrum of cobalt (II) neat complex is characterized by the highest energy 4 A 2 ? 4 T 1(P) transition at 658 nm is typical of tetrahedral Co(II) complexes [22].…”

Section: Electronic Spectral Studiesmentioning

confidence: 99%

“…These zeolite encapsulated metal complexes were used in various organic reactions like carbonylation, hydroformylation, hydrogenation, oxidation, hydroxylation etc. [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Catalytic activity of supported solid catalysts for phenol hydroxylation

Nethravathi¹,

Reddy²,

Mahendra

2014

J Porous Mater

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Cobalt(II), copper(II) and zinc(II) complexes of 2-phenylbenzimidazole (PhBzlH) encapsulated in the supercages of zeolite-Y and ZSM-5 have been synthesized and characterized by spectroscopic studies (IR, UV/visible, EPR), elemental analyses, thermal studies and X-ray diffraction patterns. The catalytic activity of encapsulated complexes was investigated for the hydroxylation of phenol using 30 % H 2 O 2 as an oxidant. Under optimized reaction conditions, the hydroxylation of phenol yielded catechol and hydroquinone as the major products. All catalysts show good selectivity for diphenol products. A maximum conversion of phenol was obtained with [Cu(PhBzlH)]-Y as the catalyst. The results showed that conversion of phenol varies in the order [ Zn(PhBzlH)]-ZSM-5 (41 %) after 6 h of reaction time. Test for the recyclability of the reaction was also carried out and the results indicate their recyclability.

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“…As this method can provide an ideal way for taking the advantages of homogenous catalysts and simultaneously avoid its disadvantages like handling and reusability. Encapsulation in porous solids such as zeolite is an attractive technique for heterogenization, since no leaching is observed when the complex is confined exclusively in the zeolite pores [13][14]. In addition, zeolite-encapsulated complexes promise better control of selectivity of the reaction and higher stability, due to NaY cavity encapsulated metal complexes, avoids direct contact with the metal complexes, reduced dimerization of complexes in the cavity.…”

Section: Introductionmentioning

confidence: 99%

Zeolite-encapsulated Co(II), Mn(II), Cu(II) and Cr(III) salen complexes as catalysts for efficient selective oxidation of benzyl alcohol

Huang

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Co(Ⅱ), Mn(Ⅱ), Cu(Ⅱ) and Cr(Ⅲ) salen type complexes were synthesized in situ in Y zeolite by the reaction of ion-exchanged metal ions with the flexible ligand molecules that had diffused into the cavities. Data of characterization indicates the formation of metal salen complexes in the pores without affecting the zeolite framework structure, the absence of any extraneous species and the geometry of encapsulated complexes. The catalytic activity results show that CosalcyenY exhibited higher catalytic activity in the water phase selective oxidation of benzyl alcohol, which could be attributed to their geometry and the steric environment of the metal actives sites.

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Zeolite encapsulated Pd(salen), a selective hydrogenation catalyst

Abstract: Pd(salen) encapsulated in zeolites X and Y is shown t o be a catalyst for the selective hydrogenation of hex-l-ene in the presence of cyclohexene at 25 "C and 400 Torr HZ.

Cited by 93 publications

References 2 publications

Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

Catalytic activity of supported solid catalysts for phenol hydroxylation

Zeolite-encapsulated Co(II), Mn(II), Cu(II) and Cr(III) salen complexes as catalysts for efficient selective oxidation of benzyl alcohol

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