An efficient and reusable silica/dendrimer supported platinum catalyst for electron transfer reactions

Li, Hongfang; Lü, Jian; Zheng, Zhaoliang; Cao, Rong

doi:10.1016/j.jcis.2010.09.047

Cited by 36 publications

(22 citation statements)

References 35 publications

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“…However, to date, the catalysis of this reaction has emphasized the use of nanomaterials, such as metallic Pt nanoparticles. [29][30][31][32][33] Thus the catalytic properties of 1 (3) with respect to the [Fe(CN) 6 ] 3À /[S 2 O 3 ] 2À reaction required exploration.…”

Section: Catalytic Reactionsmentioning

confidence: 99%

Super‐Efficient Platinum Catalyst Derived from a Semiconducting, DMF Solvate: Structural, Spectroscopic, Electrochemical, and Catalytic Characterization

Abrahams

Winther‐Jensen

et al. 2014

ChemCatChem

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The reaction of [(NH3)4Pt](NO3)2 with LiTCNQF4 (TCNQF4=2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane) in dimethylformamide gives the product [(NH3)4Pt](TCNQF4)2⋅(DMF)4 (1). Subtle changes in the solvent conditions, however, result in a different product, [(NH3)4Pt](TCNQF4)2⋅Et2O⋅(CH3OH)4/3 (2). Both 1 and 2 have been characterized by X‐ray crystallography, vibrational (FTIR, Raman) and UV/vis spectroscopy, thermogravimetric analysis and electrochemistry. Single crystals of 1 indicate the presence of 3 D networks supported by hydrogen bonding, whereas the structural analysis of 2 indicates a 2 D layered network, which consists of alternating TCNQF4− and [(NH3)4Pt]2+ layers. The conductivity of a single crystal of 1 at room temperature lies in the semiconducting range (≈2.5×10−6 S cm−1). Unexpectedly, 1 was found to exhibit an exceptionally high catalytic activity for the electron transfer reaction between ferricyanide and thiosulfate ions in aqueous media. Our analysis indicates that the DMF solvates were removed prior to the catalytic reaction, but no other changes that occur in the chemical composition were found. Thus, the active catalyst is [(NH3)4Pt](TCNQF4)2 (3) rather than the starting material 1.

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Section: Catalytic Reactionsmentioning

confidence: 99%

Super‐Efficient Platinum Catalyst Derived from a Semiconducting, DMF Solvate: Structural, Spectroscopic, Electrochemical, and Catalytic Characterization

Abrahams

Winther‐Jensen

et al. 2014

ChemCatChem

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“…The isotherms were all type IV, and a steep increase in adsorption at relative pressures of P/P 0 ≈ 0.58-0.8 for SBA-15 samples is approximately attributed to capillary nitrogen condensation according to IUPAC classification, which indicates the formation of mesoporous materials with ordered pore structures. [43] In addition, the surface area and pore volume were obviously decreased. These results clearly demonstrate that the surface modification indeed occurred inside the primary mesopores of the SBA-15.…”

Section: Resultsmentioning

confidence: 99%

Tungstate supported mesoporous silica SBA‐15 with imidazolium framework as a hybrid nanocatalyst for selective oxidation of sulfides in the presence of hydrogen peroxide

Sedrpoushan

Eshbala

Mohanazadeh

et al. 2017

Applied Organom Chemis

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In this work, a new heterogeneous catalyst (SBA‐15/Im/WO42−) was prepared, and then its performance in the oxidation of organic sulfides was studied (using 30% H2O2 as green oxidant under neutral reaction conditions). This organic–inorganic hybrid mesoporous material was characterized by various techniques, such as FT‐IR, inductively coupled plasma, X‐ray powder diffraction, high‐resolution‐transmission electron microscopy, N2 adsorption–desorption and thermogravimetric analysis. The catalyst was also applied to the selective oxidation of various sulfides. The hybrid catalyst was easily recovered, and was very stable and retained good activity for at least five successive runs without any additional activation. Moreover, there was no remarkable decrease in the activity and selectivity of the catalyst. The products could be easily isolated by just removing the solvent after filtering the catalyst. The yields of the catalytic productions through this catalyst were in the range from 75% to 97%.

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“…The linear dependence of ln (A t /A 0 )v ersusr eaction t (Figure 12 c) for Pt@CF-12 clearly indicated that the reaction followed pseudo-first-orderb ehavior.T he rate constants k were calculated from the slopeso ft he plots and determined to be 4.1 10 À3 and 1.8 10 À3 s À1 for Pt@CF-12 and Pt@F-12, respectively,w hicha re similar to those of Pt-basedc atalysts on variouss ilica supports presented in Ta ble 3f or the same reaction. [66][67][68][69][70] The Pt@CF-12 and Pt@F-12 catalysts can convert 93 and 81 %o f4 -nitrophenol to 4-aminophenol, respectively,a fter 10 min. The higher catalytic activity of Pt@CF-12 compared with Pt@F-12 couldbeascribed to the smaller size and uniform distribution of Pt NPs in the cage-type mesopores.…”

Section: Catalytic Activities Of Pt@f-12 and Pt@cf-12f Or Ab Hydrolysmentioning

confidence: 99%

Carboxylic acid Functionalized Cage‐Type Mesoporous Silica FDU‐12 as Support for Controlled Synthesis of Platinum Nanoparticles and Their Catalytic Applications

Deka

Budi

Lin

et al. 2018

Chemistry A European J

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Carboxylic acid functionalized 3D cage-type mesoporous silica FDU-12 with high surface area and pore volume was synthesized by a one-pot co-condensation method and used as support to synthesize Pt nanoparticles (NPs). The uniformly distributed COOH groups in the cage can control the growth of Pt NPs with high dispersion (Pt@CF-12). Pt@CF-12 was used as catalyst for the hydrolysis of ammonia borane to generate H and for the reduction of 4-nitrophenol to 4-aminophenol. The catalyst exhibits higher catalytic activity (H generation rate of 17.8 L min ) and lower activation energy of 30.67 kJ mol compared with other Pt-based silica catalysts due to the small size of the Pt NPs (3.5 nm) and cage-type porous structure of the support, which allowed easy diffusion of reactants. Pt@CF-12 has excellent durability, since the support prevented NP aggregation and leaching of NPs during catalysis. Pt@CF-12 can convert 93 % of 4-nitrophenol to 4-aminophenol within 10 min.

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An efficient and reusable silica/dendrimer supported platinum catalyst for electron transfer reactions

Cited by 36 publications

References 35 publications

Super‐Efficient Platinum Catalyst Derived from a Semiconducting, DMF Solvate: Structural, Spectroscopic, Electrochemical, and Catalytic Characterization

Super‐Efficient Platinum Catalyst Derived from a Semiconducting, DMF Solvate: Structural, Spectroscopic, Electrochemical, and Catalytic Characterization

Tungstate supported mesoporous silica SBA‐15 with imidazolium framework as a hybrid nanocatalyst for selective oxidation of sulfides in the presence of hydrogen peroxide

Carboxylic acid Functionalized Cage‐Type Mesoporous Silica FDU‐12 as Support for Controlled Synthesis of Platinum Nanoparticles and Their Catalytic Applications

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