Pre-prepared platinum nanoparticles supported on SBA-15 – preparation, pretreatment conditions and catalytic properties

Molnár, Éva D.; Tasi, Gyula; Niesz, Krisztián; Somorjai, Gábor A.; Kiricsi, Imre

doi:10.1007/s10562-006-9008-2

Cited by 28 publications

(16 citation statements)

References 23 publications

(21 reference statements)

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“…It was found that the obtained SBA-15 material with incorporated Pt NPs, Pt/SBA-15, also show an increased surface area and unchanged mesopore size when compared to the parent SBA-15. This is essentially different from other Pt loaded porous silicas, 32,33,[35][36][37] which in general showed a decrease of surface area of SBA-15 after addition of Pt, regardless of the used additional agent. Moreover, catalytic tests indicated that the Pt/SBA-15 material prepared by the method presented here shows a high and stable activity either for gas-phase CO oxidation or for liquid-phase cyclooctadiene hydrogenation, suggesting that this material has great potential for practical applications.…”

contrasting

confidence: 88%

Facile one-pot synthesis of Pt nanoparticles /SBA-15: an active and stable material for catalytic applications

Zhu

Xie

Carabineiro

et al. 2011

Energy Environ. Sci.

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Pt/SBA-15 with an enhanced surface area but unchanged pore diameter (compared to pure SBA-15) and a Pt average particle size of $9 nm shows a high and stable activity for both gas-phase CO oxidation and liquid-phase cyclooctadiene hydrogenation. No intrinsic change in the structure of the catalyst occurs after several reaction cycles, suggesting that the Pt/SBA-15 presented here is an active and stable catalyst.Supported noble metal catalysts are widely used in industrial applications due to their excellent catalytic performances, either for high temperature gas-phase reactions (e.g. purification of exhaust gas) [1][2][3] or for moderate temperature liquid-phase reactions (e.g. synthesis of organic chemicals) 4-6 or others. 7,8 However, as supported noble metals are prone to aggregation and leaching during reactions, deactivation often occurs quickly, which obviously should be avoided considering the high costs of these catalysts. Therefore, preparation of noble metal catalysts with good catalytic performance, but also high stability, is essential for practical applications.Bulk noble metals are expensive and have low surface areas thus show none or low catalytic activity. Therefore, supports are frequently used on which small nanoparticles of the noble metals are immobilized, yielding an increased number of accessible active sites and thus decreasing the cost and increasing the catalytic performance. 9However, for the preparation of such catalysts some issues have to be addressed, e.g. finding suitable preparation methods, the selection of supports, the choice of the metal precursors, etc., as different materials or technologies used can lead to diverse catalytic properties.Porous silicas are one of the most commonly used supports for noble metals. In this respect SBA-15 type silica 10-13 has received a lot of attention since it was first reported, and, at least in the scientific literature, it is now one of the most widely used supports in catalysis. This is due to the straightforward synthesis and its highly defined textural properties, such as the high surface area, ordered pore structure, controllable pore size, etc. As the surface of SBA-15 is relatively inert, it is difficult to directly graft metal nanoparticles (NPs) on it. Hence, additives or surfactants are often used to functionalize the SBA-15 surface before grafting the metal NPs, and their deposition on the surface is usually carried out by a post-synthesis method.14-20 This often leads to formation of NPs lacking uniformity in size and shape. Furthermore, the interaction between the NPs and the support is often not strong enough, and therefore agglomeration 20-24 or leaching 24-29 of the catalyst during the reaction is often observed. This is true in particular for noble metal catalysts. Broader contextSupported noble metals are active catalysts for various reactions in heterogeneous catalysis. However, there are also several problems in practical applications, such as aggregation and leaching. Preparation of highly active and stable nano-scale ...

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confidence: 88%

Facile one-pot synthesis of Pt nanoparticles /SBA-15: an active and stable material for catalytic applications

Zhu

Xie

Carabineiro

et al. 2011

Energy Environ. Sci.

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“…4 Dispersed and supported platinum group metal nanoparticles are used in the catalysis of a broad range of reactions: fuel-cell reactions, electrontransfer reactions, hydrogenations, oxidations, decomposition reactions, etc. 5,6 The most common method used to synthesize platinum group metal nanoparticles is chemical reduction in a solution using hydrogen gas, [7][8][9][10][11][12][13] alcohols, [14][15][16][17][18][19][20] ethylene glycol, 21 various hydrides [22][23][24] or other reducing agents. 25,26 Platinum group metal nanoparticles can also be produced by electrochemical reduction, 27,28 laser ablation of a platinum metal plate, 29 microemulsion method, 30 aerosol assisted deposition method 31 or partial dissolution of Au-Pt nanoalloys.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Platinum Group Metal Nanoparticles

Krehula¹,

Musić²

2011

Croat. Chem. Acta

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Abstract. A novel route for the synthesis of platinum group metal nanoparticles has been reported. The synthesis is based on the addition of tetramethylammonium hydroxide (TMAH) to the aqueous PtCl 4 , IrCl 3 or Rh(NO 3 ) 3 solution followed by the hydrothermal treatment of these precipitation systems at 160 ºC. The mean size of nanoparticles was 9.2 nm for platinum, 21 nm for iridium, and 28 nm for rhodium. The average crystallite size was estimated at 7.4 nm for platinum, 3.1 nm for iridium and 3.5 nm for rhodium. The possible mechanism of platinum group metal nanoparticles formation is briefly discussed. (doi: 10.5562/cca1856)

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“…Despite various systems contain heterogeneous catalyst for oxidation of alcohols, there are still major challenges such as high catalyst loading, homogeneous behavior of palladium, potentially susceptible to degradation under oxidation conditions, catalyzed only active substrate without sterically demanding substituent and instability of support which can restrict catalyst applications. [8][9][10][11][12][13][14][15][16] A new way was developed by Somorjai group 17,18 in order to prepare supported catalyst containing metal nanoparticles. In this technique, first the metal nanoparticles are synthesized with capping agents in the solution and then are guided into the pores of SBA-15 which showed superiority over other methods such as ion exchange, 19 chemical vapor deposition 20 and impregnation 21 in control of the particle size, shape and formation of metal nanoparticles both inside and outside of the pores.…”

Section: Introductionmentioning

confidence: 99%

“…In this technique, first the metal nanoparticles are synthesized with capping agents in the solution and then are guided into the pores of SBA-15 which showed superiority over other methods such as ion exchange, 19 chemical vapor deposition 20 and impregnation 21 in control of the particle size, shape and formation of metal nanoparticles both inside and outside of the pores. 17,18 In addition the porous SBA-15 can inhibit further particles growth, agglomeration in catalyst preparation and especially in subsequent catalytic reactions. 22 Herein, we investigate the synthesis and characterization of SBA-15 supported palladium oxide nanoparticles, PdO/SBA-15 catalyst, and its applications for oxidation of alcohols in two different conditions which develops a more active and recyclable heterogeneous catalyst.…”

Section: Introductionmentioning

confidence: 99%

Supported Palladium Oxide Nanoparticles in SBA‐15 as a Heterogeneous Catalyst for the Aerobic Oxidation of Alcohols

Atashin

Malakooti

2014

J Chinese Chemical Soc

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Palladium nanoparticles were first synthesized through the thermal decomposition method and subsequently immobilized on ordered mesoporous silica material, SBA-15, to afford PdO/SBA-15 catalyst. The synthesized catalyst was characterized by X-ray diffraction, nitrogen adsorption-desorption measurement, transmission electron microscopy, and inductively coupled plasma atomic emission spectrometry. The catalytic activity was tested for the aerobic oxidation of alcohols. Easy recovery, high yeilds and relatively short reaction times were observed for the mentioned catalyst.

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Pre-prepared platinum nanoparticles supported on SBA-15 – preparation, pretreatment conditions and catalytic properties

Cited by 28 publications

References 23 publications

Facile one-pot synthesis of Pt nanoparticles /SBA-15: an active and stable material for catalytic applications

Facile one-pot synthesis of Pt nanoparticles /SBA-15: an active and stable material for catalytic applications

Hydrothermal Synthesis of Platinum Group Metal Nanoparticles

Supported Palladium Oxide Nanoparticles in SBA‐15 as a Heterogeneous Catalyst for the Aerobic Oxidation of Alcohols

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