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

Li, Changli; Zhang, Qinghong; Wang, Ye; Wan, Huilin

doi:10.1007/s10562-007-9263-x

Cited by 56 publications

(35 citation statements)

References 36 publications

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“…Nevertheless, for the heterogeneous Pd-catalyzed oxidation of alcohols, Pd(0) has been proposed as the active phase in many systems. [7,8,[11][12][13][14][15][16] Solid evidence has been obtained to support this in some research papers. For examples, Mori et al [7b] have confirmed that Pd species over hydroxyapatite are transformed to Pd(0) nanoparticles after the oxidation of 1-phenylethanol via EXAFS measurements; Grunwaldt et al [8] have clarified that the metallic Pd over Al 2 O 3 support is much more active (over 50 times) for the aerobic oxidation of benzyl alcohol than the oxidic Pd species.…”

Section: Structure-sensitivity Of Pd Nanoparticles-catalyzed Oxidatiomentioning

confidence: 92%

“…[13,14] Pd nanoparticles located in zeolite NaX or mesoporous silica SBA-15 could catalyze the solvent-free aerobic oxidation of several kinds of alcohols. [15,16] A Pd-Au/TiO 2 catalyst could give excellent TOFs for the aerobic oxidation of various alcohols, and it was suggested that the Au-Pd nanocrystals made of an Au-rich core with a Pd-rich shell accounted for the superior catalytic performances of this catalyst. [17] It is well known that catalytic performances can be very sensitive to the size of the active phase.…”

Section: Introductionmentioning

confidence: 99%

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Size‐Dependent Catalytic Activity of Supported Palladium Nanoparticles for Aerobic Oxidation of Alcohols

et al. 2008

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Silica-alumina (SiO 2 -Al 2 O 3 )-supported palladium catalysts prepared by adsorption of the tetrachloropalladate anion (PdCl 4 2À ) followed by calcination and reduction with either hexanol or hydrogen were studied for the aerobic oxidation of alcohols. The mean size of the Pd particles over the SiO 2 -Al 2 O 3 support was found to depend on the Si/Al ratio, and a decrease in the Si/Al ratio resulted in a decrease in the mean size of the Pd nanoparticles. By changing the Si/Al ratio, we obtained supported Pd nanoparticles with mean sizes ranging from 2.2 to 10 nm. The interaction between the Pd precursor and the support was proposed to play a key role in tuning the mean size of the Pd nanoparticles. The Pd/SiO 2 -Al 2 O 3 catalyst with an appropriate mean size of Pd particles could catalyze the aerobic oxidation of various alcohols to the corresponding carbonyl compounds, and this catalyst was particularly efficient for the solvent-free conversion of benzyl alcohol. The intrinsic turnover frequency per surface Pd atom depended significantly on the mean size of Pd particles and showed a maximum at a medium mean size (3.6-4.3 nm), revealing that the aerobic oxidation of benzyl alcohol catalyzed by the supported Pd nanoparticles was structure-sensitive.

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Section: Structure-sensitivity Of Pd Nanoparticles-catalyzed Oxidatiomentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Size‐Dependent Catalytic Activity of Supported Palladium Nanoparticles for Aerobic Oxidation of Alcohols

et al. 2008

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“…[47] The synthesis is based on the adsorption of a cationic Pd precursor at pH 8-11 onto the negatively charged surface of non-calcined SBA-15, followed by calcination at 550 8C and reduction of Pd II in H 2 at 300 8C. Clearly, the pH of the solution played a key role in the adsorption of the Pd precursor onto the support.…”

Section: Palladiummentioning

confidence: 99%

Embedded Phases: A Way to Active and Stable Catalysts

et al. 2010

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Industrial catalysts are typically made of nanosized metal particles, carried by a solid support. The extremely small size of the particles maximizes the surface area exposed to the reactant, leading to higher reactivity. Moreover, the higher the number of metal atoms in contact with the support, the better the catalyst performance. In addition, peculiar properties have been observed for some metal/metal oxide particles of critical sizes. However, thermal stability of these nanostructures is limited by their size; smaller the particle size, the lower the thermal stability. The ability to fabricate and control the structure of nanoparticles allows to influence the resulting properties and, ultimately, to design stable catalysts with the desired characteristics. Tuning particle sizes provides the possibility to modulate the catalytic activity. Unique and unexpected properties have been observed by confining/embedding metal nanoparticles in inorganic channels or cavities, which indeed offers new opportunities for the design of advanced catalytic sytems. Innovation in catalyst design is a powerful tool in realizing the goals of more green, efficient and sustainable industrial processes. The present Review focuses on the catalytic performance of noble metal‐ and non precious metal‐based embedded catalysts with respect to traditional impregnated systems. Emphasis is dedicated to the improved thermal stability of these nanostructures compared to conventional systems.

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“…All samples exhibit one intense peak at 0.8-1.0 • along with two weak peaks at 1.3-2.0 • , which can be assigned to the (1 0 0), (1 1 0), and (2 0 0) plane reflections of the two-dimesional hexagonal mesostructure with a space group of p6mm symmetry [29], indicating that the incorporation of Pd has negligible influence on the original structure of SBA-15. However, the intensities of these diffraction peaks have a slight decrease for samples synthesized via the grafting approach, indicating that the mesoporous channels of SBA-15 may be occupied by Pd nanoparticles [23]. By carefully comparing the patterns in Fig.…”

Section: Samplementioning

confidence: 99%

“…8.2 nm). Zhang and co-workers [23] 0304-3894/$ -see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.jhazmat.2010.05.113 prepared highly dispersed Pd/SBA-15 catalysts (Pd size = 3-4 nm) using a simple adsorption method under alkaline conditions.…”

Section: Introductionmentioning

confidence: 99%

Ligand-assisted preparation of highly active and stable nanometric Pd confined catalysts for deep catalytic oxidation of toluene

Peng

Wang

et al. 2010

Journal of Hazardous Materials

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a b s t r a c tIn this study, mesoporous SBA-15 supported Pd catalysts were synthesized through impregnation and grafting approaches. Moreover, the influences of different solvents (ethanol, H 2 O, tetrahydrofuran, dimethyl sulphoxide and N,N-dimethylformamide) on the dispersion of supported Pd nanoparticles were also systematically investigated. The prepared materials were comprehensively explored by various techniques, including XRD, EDS, ICP-OES, H 2 chemisorption, N 2 adsorption/desorption, TG-DSC, FT-IR, TEM and STEM. It is found that the traditional impregnation method has some disadvantages in obtaining highly dispersed Pd active phase. Whereas, the grafting method could highly disperse Pd nanoparticles within the mesoporous channels of support material, and the grafting procedure should be promising in designing highly dispersed Pd particles on the silica-based mesoporous materials. The catalyst prepared via the grafting procedure possesses much higher activity and selectivity than that prepared by impregnation method for deep catalytic oxidation of toluene.

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

Cited by 56 publications

References 36 publications

Size‐Dependent Catalytic Activity of Supported Palladium Nanoparticles for Aerobic Oxidation of Alcohols

Size‐Dependent Catalytic Activity of Supported Palladium Nanoparticles for Aerobic Oxidation of Alcohols

Embedded Phases: A Way to Active and Stable Catalysts

Ligand-assisted preparation of highly active and stable nanometric Pd confined catalysts for deep catalytic oxidation of toluene

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