Iron, cobalt or nickel substituted MCM-41 molecular sieves for oxidation of hydrocarbons

Pârvulescu, Viorica; Su, Bao‐Lian

doi:10.1016/s0920-5861(01)00384-4

Cited by 160 publications

(69 citation statements)

References 16 publications

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“…Molecular sieves when supported onto another functional material were exhibited high potential due to their high thermal stability, their relatively high specific surface area and/or their beneficial role in terms of resistance to poisons [5,6]. Many materials containing mainly metals as the precursors supported/intercalated on/in molecular sieves are proposed as catalysts for the oxidation of organic compounds [7,8]. During the past decades, transition metal modified mesoporous silicates have been studied widely due to the excellent acidity or oxidizing property [9].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Wet Oxidation of Pharmaceutical Sludge by Molecular Sieve Loaded with Cu/Ce

2018

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Abstract:In the present study, the catalytic wet oxidation of pharmaceutical sludge by molecular sieve loaded with Cu/Ce as catalyst was investigated. Experiments were performed in an experimental batch reactor. Reaction parameters including catalyst dose, temperature, time, and oxygen pressure were discussed. The results showed that the catalysts prepared by co-precipitating method have good catalytic performance. Under optimum conditions, the highest volatile suspended solids (VSS) removal rate approximately 92% and chemical oxygen demand (COD) removal rate of 75% were obtained at 260 • C for 60 min with initial oxygen pressure 1.0 MPa and the catalyst 10 g/L. These results implied that the catalytic wet oxidation of pharmaceutical sludge by molecular sieve loaded with Cu/Ce is a promising method for the highly efficient degradation of the sludge.

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Section: Introductionmentioning

confidence: 99%

Catalytic Wet Oxidation of Pharmaceutical Sludge by Molecular Sieve Loaded with Cu/Ce

2018

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“…Particularly, vanadium incorporated molecular sieves have been considered as selective oxidation potential catalysts of large organic molecules under mild conditions [11,[13][14][15][16][17]. The activity and selectivity of these catalysts were found to be sensitive to the nature of V species in the matrix, which includes oxidation state, coordination condition, dispersion, and stability [11,18].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Silicates with Spherical Morphology Modified with Vanadium Highly Active in Oxidation of Cyclohexene with H2O2

et al. 2011

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Vanadium-containing mesoporous molecular sieves have been prepared by hydrothermal treatment at 373 K. These materials showed spherical morphology with a narrow particle size distribution between 2 and 4 lm. The techniques used for their physicochemical characterization were: XRD, AAS, N 2 physisorption, SEM, TEM and DR-UV-Vis spectroscopy. All the materials presented high specific surface area ([900 m 2 /g), characteristic of MCM-41 materials. A well-defined mesoporous structure was observed by TEM measures although there was no onedimensional ordering of pores characteristic of such materials. Additionally, secondary mesoporosity domains were determined in the BJH size distribution. The sample synthesized with the highest content of V presented marked differences in their structural characteristics, which were attributed to the blockage of channels by the presence of nano-clusters and/or V x O y nano-oxides. From the DR-UV-Vis analysis, a successful incorporation of V ions to silica structure in tetrahedral coordination with oxygen of the network could be inferred. The catalytic activity of these materials was evaluated in the test reaction of cyclohexene oxidation using H 2 O 2 as oxidizing agent, showing a high conversion of about 93% respect to the maximum, resulting dominant the radicalary mechanism over the direct oxidation mechanism. Apparently, the isolated V ions incorporated into the silica structure would be responsible for the high catalytic activity of these materials.

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“…For this reason, it is desirable that direct hydroxylation of benzene to phenol under mild conditions with high yield is developed. Several materials have been reported as catalysts and supported catalysts for the liquid-phase hydroxylation process with H 2 O 2 as oxidant [77][78][79][80][81][82]. The direct hydroxylation of benzene to phenol using H 2 O 2 as oxidant and various metals supported on Al-PILC has been reported by Pan et al [83], who studied the effects of solvent nature, reaction temperature, and benzene/H 2 O 2 molar ratio on the conversion of benzene to phenol.…”

Section: Aromatic Ring Oxidationmentioning

confidence: 99%

Pillared Clay Catalysts in Green Oxidation Reactions

Vicente

Trujillano

Ciuffi

et al. 2010

Pillared Clays and Related Catalysts

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In this chapter, the use of pillared clays as catalysts in green oxidation reactions is considered. Several catalytic oxidation reactions have been selected, and special attention is given to the reaction products and to the yields achieved.Keywords PILC · Pillared clays · Green oxidation reactions · Catalysts IntroductionPillared InterLayered Clays (PILCs, in short) are prepared by exchanging the charge-compensating cations present in the interlamellar space of the clays with hydroxy-metal polycations. On calcination, the inserted polycations yield rigid, thermally stable oxide species, which prop the clay layers apart and prevent their collapse. The intercalation and pillaring processes produce the development of a porous structure with the presence of particular surface sites. These solids have been used in catalytic, purification, and sorption-based separation applications.The methods and the mathematical models used in the characterization of the porous structure of PILCs have been presented in a recent review [1]. From this study and all the references cited therein, it is clear that a great interest exists in the microporous structure of PILCs as well as in the effect of their structure on the applications of these materials. In summary, several researchers have suggested a bimodal micropore distribution for the microporous structure developed by the intercalated and the pillared clays, but this suggestion is open to questioning and can contribute to the expansion of this field in the coming years.Interest in the application of PILCs as catalysts has undergone a huge increase over the last few years [1,2]. One of the most studied subjects related to PILCs

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Iron, cobalt or nickel substituted MCM-41 molecular sieves for oxidation of hydrocarbons

Cited by 160 publications

References 16 publications

Catalytic Wet Oxidation of Pharmaceutical Sludge by Molecular Sieve Loaded with Cu/Ce

Catalytic Wet Oxidation of Pharmaceutical Sludge by Molecular Sieve Loaded with Cu/Ce

Mesoporous Silicates with Spherical Morphology Modified with Vanadium Highly Active in Oxidation of Cyclohexene with H2O2

Pillared Clay Catalysts in Green Oxidation Reactions

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