Characterization of copper and zinc containing MCM-41 and MCM-48 mesoporous molecular sieves by temperature programmed reduction and carbon monoxide adsorption

Hartmann, Martin; Racouchot, Sandrine; Bischof, C.

doi:10.1016/s1387-1811(98)00264-9

Cited by 100 publications

(38 citation statements)

References 52 publications

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“…Similar behavior has been reported by Mart ınez et al 30 for cobalt-loaded mesoporus silica. Generally, nonsupported copper reduction of bulk CuO to Cu o is considered as one-step process at about 500 K. 31 In the case of supported CuO, reduction can occur in the range of 400-600 K, depending on the copper oxide dispersion and the nature of the support. 32 Generally, small particles are expected to get reduced at lower temperatures, and the bulk copper oxide is expected to get reduced at higher temperature.…”

Section: Results and Discussion Characterizationmentioning

confidence: 99%

Catalytic Activity of Cu/SBA‐15 for Peroxidation of Pyridine Bearing Wastewater at Atmospheric Condition

2013

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In this study, Cu-loaded Santa Barbara amorphous (SBA)-15 catalysts were synthesized by impregnation method and further used for catalytic wet peroxidation (CWPO) of pyridine from aqueous solution using hydrogen peroxide as oxidant. The synthesized catalysts have been characterized by Brunauer-Emmett-Teller surface area: temperature-programmed reduction, H 2 -chemisorption, Fourier transform infrared spectroscopy, and field emission scanning electron microscopy. Characterization results indicate good dispersion of Cu species inside the porous structure of SBA-15. The effect of various parameters such as Cu loading on SBA-15, pH, catalyst dose, H 2 O 2 concentration, and temperature have been studied for their effect on CWPO of pyridine. More than 97% pyridine removal and 92% total organic carbon removal was achieved at optimum condition. Cu/SBA-15 showed stable performance during reuse for six cycles with negligible copper leaching.

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Section: Results and Discussion Characterizationmentioning

confidence: 99%

Catalytic Activity of Cu/SBA‐15 for Peroxidation of Pyridine Bearing Wastewater at Atmospheric Condition

2013

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“…All-silica MCM-41 materials with different pore diameters were synthesized using dodecyltrimethylammonium bromide (C 12 MCM-41) and hexadecyl trimethylammonium bromide (C 16 MCM-41), respectively, as reported in our previous papers [18][19][20]. The SBA-15 materials was synthesized by employing the tribloc copolymer poly(ethylene glycol)-bloc-poly(propylene glycol)-bloc-poly(ethylene glycol) (Pluronic P123, molecular weight 5800, EO 20 PO 70 EO 20 ) as reported in the literature [21].…”

Section: Reagents Probes and Materialsmentioning

confidence: 99%

Dynamics of pH-sensitive nitroxide radicals in water adsorbed in ordered mesoporous molecular sieves by EPR Spectroscopy

Kovaleva

Молочников

Golovkina

et al. 2013

Microporous and Mesoporous Materials

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a b s t r a c tA spin pH probe technique was used to study the influence of the channel diameter on the EPR spectra of pH-sensitive nitroxide radicals (NR) located in the channels of the mesoporous molecular sieves MCM-41 and SBA-15 with diameters ranging from 2.3 to 8.1 nm. From EPR spectra analysis and the results of the NR retention by the mesoporous molecular sieves upon washing with an aqueous KCl solution, the regularities of NR molecular location inside the channels were studied. The obtained dependence of the fraction of the radical molecules in the fast motional regime (with the rotational correlation times, s c = 2 Â 10 À11 s-9 Â 10 À11 s) in the channels of the mesoporous molecular sieves as a function of pH indicates that both NR in the fast and slow motional regime (with s c = 8 Â 10 À9

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“…When dealing with MCM-41 materials containing Cu and Pd, the main drawback to be avoided is the segregation of large Cu [26][27][28][29][30][31][32] and Pd [33][34][35][36][37][38][39] oxide or metallic particles during the catalyst preparation, which is well-known to be dependent on the incorporation method. In bimetallic Pd/Cu-MCM-41 catalysts, we observed that the nature and size of active species depend on the synthesis procedure, namely co-impregnation of PdCl 2 and CuCl 2 and addition of Pd and Cu during the MCM-41 synthesis as cations or as preformed nanoparticles [6,7].…”

Section: Introductionmentioning

confidence: 99%

Pd–Cu interaction in Pd/Cu-MCM-41 catalysts: Effect of silica source and metal content

et al. 2015

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Characterization of copper and zinc containing MCM-41 and MCM-48 mesoporous molecular sieves by temperature programmed reduction and carbon monoxide adsorption

Cited by 100 publications

References 52 publications

Catalytic Activity of Cu/SBA‐15 for Peroxidation of Pyridine Bearing Wastewater at Atmospheric Condition

Catalytic Activity of Cu/SBA‐15 for Peroxidation of Pyridine Bearing Wastewater at Atmospheric Condition

Dynamics of pH-sensitive nitroxide radicals in water adsorbed in ordered mesoporous molecular sieves by EPR Spectroscopy

Pd–Cu interaction in Pd/Cu-MCM-41 catalysts: Effect of silica source and metal content

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