Influence of solvents on the formation of Pd and PdO nanoparticles in SBA-15

Lee, Seoung Soo; Park, Ho-In; Park, Byoung-Kyu; Byeon, Song‐Ho

doi:10.1016/j.mseb.2006.08.028

Cited by 21 publications

(5 citation statements)

References 19 publications

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“…SBA-15 has successfully been applied as a support for various catalytically active phases [17][18][19]. The influence of solvents on the formation of metal and its oxides nanoparticles in SBA-15 was also investigated [20]. However, there is little literature about the catalyst using SBA-15 as support for the ODH of ethane with CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Oxidative Dehydrogenation of Ethane to Ethylene with Carbon dioxide over Cr–Ce/SBA-15 Catalysts

Shi

Wang

2008

Catal Lett

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Chromium oxide supported on SBA-15 was modified with Ce species by an incipient method. The effect of Ce on the activity of Cr/SBA-15 catalyst in the dehydrogenation of ethane with CO 2 was investigated. The activity is enhanced for Ce modified Cr/SBA-15 catalyst for the dehydrogenation of ethane with CO 2 . The cycle between Cr 6+ and Cr 3+ species can be carried out viaing the dehydrogenation of ethane and oxidation of CO 2 processes.

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Section: Introductionmentioning

confidence: 99%

Oxidative Dehydrogenation of Ethane to Ethylene with Carbon dioxide over Cr–Ce/SBA-15 Catalysts

Shi

Wang

2008

Catal Lett

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“…The simple impregnation has been employed for the preparation of SBA-15-supported Pd particles [17,18], but this method could not ensure the encapsulation of Pd nanoparticles inside the mesoporous channels. Chemical vapor infiltration was once used for the preparation of SBA-15-confined Pd [19], but Pd nanowires were mainly obtained.…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization and Catalytic Activity of Palladium Nanoparticles Encapsulated in SBA-15

Zhang

Wang

et al. 2007

Catal Lett

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A simple adsorption method was studied for the preparation of SBA-15-encapsulated palladium nanoparticles. This method employed the SBA-15 with organic template removed by ethanol extraction for the adsorption of cationic Pd precursors in alkaline solution followed by calcination and H 2 reduction. The pH of the solution was found to be a critical factor in determining the palladium content and the ordered mesoporous structure. Our characterizations revealed that the Pd nanoparticles prepared by this method were located inside the mesoporous channels and were quite uniform in size (mostly 3-4 nm). The SBA-15-encapsulated uniform Pd nanoparticles were efficient catalysts for solvent-free aerobic oxidation of alcohols.

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“…Another advantage in comparison to direct synthesis is the high percentage of impregnation of the components in the active sites, the values approach or even exceed the estimated theoretical percentage without destroying the support mesostructure [59][60][61]. Despite the mentioned advantages, the post synthesis method presents some drawbacks, such as: production of non-uniform materials due to evaporation process that leads to the migration of the material from the pores to the surface [58]; reduction of surface area, pore volume, pore diameter [25,[59][60][61]; dependence on the nature of the solvent to ensure adequate distribution and dispersion of the particles in the carrier [43]; and oxidation of transition metal oxides giving low heteroatom dispersion [62]. It is difficult to obtain an adequate interaction between the precursor species of the heteroatom and the surface silane groups of the support [46,63,64].…”

Section: Post-synthesis or Post-grafting Methodsmentioning

confidence: 99%

“…Despite of the interest of the scientific community and researches accomplished, the functionalization of SBA-15 is challenging task because the heteroatoms can be introduced into the silica wall by replacing Si 4+ , within the mesopores or on the outer surface and modify the original properties of the support [15]. Literature report several methods of SBA-15 functionalization such as: direct synthesis or "one pot" procedure [25,[38][39][40][41], wetness impregnation [40,[42][43][44], deposition-precipitation (DP) [45][46][47], graft hybrid (GH) [48,49], colloid immobilization (CI) [50][51][52][53], nanoparticles encapsulation (NE) [54,55]. We briefly reviewed already mentioned methods of SBA-15 functionalization, because it is are the most reported in the literature, to verify if such methods are satisfactory or if we need of new functionalization method/strategies.…”

Section: Introductionmentioning

confidence: 99%

Functionalization methods of SBA-15 mesoporous molecular sieve: a brief overview

et al. 2019

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SBA-15 molecular mesoporous sieve has attracted great interest of researchers since its discovery in 1998, owing large area surface, well-defined pores, uniform pore size, high thermal and hydrothermal stability, well-defined pore structure and ability to be functionalized with diverse metal oxides (active phase of catalyst). This work contains a brief review of the main SBA-15 functionalization methods: direct synthesis, post-synthesis or post-grafting, deposition-precipitation, graft hybrid, colloid immobilization and nanoparticle encapsulation showing the advantages and disadvantages of each. We also approach some synthetic strategies to overcome the shortcomings of the mentioned methods, as well as some parameters to choose the best method. Here, we showed that these methods don't provide the functionalization of SBA-15 keeping all the peculiar properties of support and that the new strategies or alternatives routes are important to overcome some challenges of the functionalization of SBA-15. This is a challenging point that needs to be further explored by promoting greater advances in materials science and catalysis.

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Influence of solvents on the formation of Pd and PdO nanoparticles in SBA-15

Cited by 21 publications

References 19 publications

Oxidative Dehydrogenation of Ethane to Ethylene with Carbon dioxide over Cr–Ce/SBA-15 Catalysts

Oxidative Dehydrogenation of Ethane to Ethylene with Carbon dioxide over Cr–Ce/SBA-15 Catalysts

Preparation, Characterization and Catalytic Activity of Palladium Nanoparticles Encapsulated in SBA-15

Functionalization methods of SBA-15 mesoporous molecular sieve: a brief overview

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