Promotion effect in Pt–ZnO catalysts for selective hydrogenation of crotonaldehyde to crotyl alcohol: A structural investigation

Wang, Di; Ammari, Fatima; Touroude, R.; Su, Dang Sheng; Schlögl, Robert

doi:10.1016/j.cattod.2008.10.018

Cited by 20 publications

(17 citation statements)

References 26 publications

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“…Colloidal Pt nanoparticles were prepared adapting the method of Jones et al [26], employing a H 2 PtCl 6 ·H 2 O precursor since residual chlorine has been found to have a promotional effect in the selective hydrogenation of ␣,␤-unsaturated aldehydes [27]. To a stirred 10 ml aliquot of ethylene glycol (Fisher >99%) at 120 • C, 50 l of 0.1 M aqueous sodium hydroxide solution was added to promote nucleation.…”

Section: Synthesismentioning

confidence: 99%

Highly selective hydrogenation of furfural over supported Pt nanoparticles under mild conditions

Taylor

Durndell

Isaacs

et al. 2016

Applied Catalysis B: Environmental

328

205

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a b s t r a c tThe selective liquid phase hydrogenation of furfural to furfuryl alcohol over Pt nanoparticles supported on SiO 2 , ZnO, ␥-Al 2 O 3 , CeO 2 is reported under extremely mild conditions. Ambient hydrogen pressure, and temperatures as low as 50 • C are shown sufficient to drive furfural hydrogenation with high conversion and >99% selectivity to furfuryl alcohol. Strong support and solvent dependencies are observed, with methanol and n-butanol proving excellent solvents for promoting high furfuryl alcohol yields over uniformly dispersed 4 nm Pt nanoparticles over MgO, CeO 2 and ␥-Al 2 O 3 . In contrast, non-polar solvents conferred poor furfural conversion, while ethanol favored acetal by-product formation. Furfural selective hydrogenation can be tuned through controlling the oxide support, reaction solvent and temperature.

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Section: Synthesismentioning

confidence: 99%

Highly selective hydrogenation of furfural over supported Pt nanoparticles under mild conditions

Taylor

Durndell

Isaacs

et al. 2016

Applied Catalysis B: Environmental

328

205

View full text Add to dashboard Cite

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“…Moreover, from Figure 3c, we can clearly see that the small nanoparticles consist of dots with alternate bright and grey contrasts: the bright dots represent columns of Pt atoms, and the grey dots represent columns of Zn atoms along the incident electron beam direction. It has been reported that, during the H 2 reduction at temperatures >250˝C, Pt nanoparticles interact with the ZnO support and that PtZn nanoalloys form [27,29,30,33]. Therefore, it is reasonable to conjecture that, after high temperature reduction, PtZn alloy nanoparticles were formed in our catalysts.…”

Section: Resultsmentioning

confidence: 92%

“…The activity differences must have originated from the effects of the H2 reduction treatment at different temperatures. Considering that PtZn alloy can form during H2 reduction at temperatures higher than 250 °C [27,29,30,33], we propose that the presence of the PtZn alloy nanoparticles in the Pt/ZnO NW-H300 catalyst may have improved the WGS activity. Detailed examinations revealed that there were no detectable PtZn alloy nanoparticles in the Pt/ZnO NW-H200 catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, we illustrate this general synthesis method for fabricating ZnO nanowire supported PtZn nanoalloy catalysts. PtZn alloy nanoparticles have been synthesized through many methods including the reaction of Zn vapor with Pt particles supported on carbon [25], electrodeposition of Zn onto Pt particles [26], and heating Pt particles on ZnO supports under a reducing atmosphere [27][28][29][30]. A recent review article published by Long et al [31] gives an elaborate survey of the development of Pt-based catalysts, the important role of the structure, size, shape, and morphology of Pt nanoparticles, and their applications for energy conversion.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Anchored Bimetallic Catalysts via Epitaxy

et al. 2016

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Abstract:The development of thermodynamically stable supported bimetallic catalysts for high-temperature reaction is significant and highly desirable but remains a grand challenge. In this work, we report a novel approach that relies on the interaction of metal nanoparticles with the support material to form unique bimetallic nanoparticles, which epitaxially anchor onto the support surface. Such unique nanostructured systems are catalytically active and ultrastable during selected catalytic reactions. In this paper, we describe the synthesis processes of ultrastable PtZn nanoparticles epitaxially anchored onto ZnO nanowires, which primarily consist of {10´10} nanoscale facets. Such anchored PtZn nanoparticles demonstrated good stability during high temperature treatments and selected catalytic reactions. The synthesis approach reported in this work provides a new strategy to develop thermodynamically stable supported bimetallic catalysts.

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“…purification of exhaust gas) [1][2][3] or for moderate temperature liquid-phase reactions (e.g. synthesis of organic chemicals) [4][5][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.…”

mentioning

confidence: 99%

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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Promotion effect in Pt–ZnO catalysts for selective hydrogenation of crotonaldehyde to crotyl alcohol: A structural investigation

Cited by 20 publications

References 26 publications

Highly selective hydrogenation of furfural over supported Pt nanoparticles under mild conditions

Highly selective hydrogenation of furfural over supported Pt nanoparticles under mild conditions

Synthesis of Anchored Bimetallic Catalysts via Epitaxy

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

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