A comparative study of strong metal–support interaction and catalytic behavior of Pd catalysts supported on micron- and nano-sized TiO2 in liquid-phase selective hydrogenation of phenylacetylene

Weerachawanasak, Patcharaporn; Praserthdam, Piyasan; Arai, Masahiko; Panpranot, Joongjai

doi:10.1016/j.molcata.2007.10.006

Cited by 53 publications

(36 citation statements)

References 34 publications

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“…Panpranot and co-workers used micron-and nano-sized TiO2 materials prepared by solvothermal method for Pd catalysts for the liquid-phase selective hydrogenation of phenylacetylene [11,12]. They demonstrate that a higher catalytic performance can be achieved with Pd catalyst supported on nano-sized TiO2 and reduced at a high temperature of 500 ºC.…”

Section: Introductionmentioning

confidence: 99%

Influence of Crystallite Size of TiO2 Supports on the Activity of Dispersed Pt Catalysts in Liquid-Phase Selective Hydrogenation of 3-Nitrostyrene, Nitrobenzene, and Styrene

et al. 2014

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Supported Pt catalysts were prepared using several kinds of TiO2 supports different in the crystallite size in the range of 10 -500 nm and their catalytic activity was tested for the liquid-phase hydrogenation of 3-nitrostyrene, nitrobenzene, and styrene. With Pt on smaller TiO2 crystallites (nanocrystals), the selectivity to vinylaniline was improved in the hydrogenation of 3-nitrostyrene (regioselective hydrogenation) and the selectivity to aniline was promoted in the hydrogenation of a mixture of nitrobenzene and styrene (chemoselective hydrogenation). The effects of TiO2 crystallite size were discussed on the basis of the results of turnover frequency and FTIR of CO adsorbed on dispersed Pt particles.Low coordinated and/or electron-rich Pt sites should be formed on the surface of nanocrystal TiO2 supports. Nanocrystal TiO2 support is an important factor for controlling and improving the catalytic performance of dispersed Pt particles.

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Section: Introductionmentioning

confidence: 99%

Influence of Crystallite Size of TiO2 Supports on the Activity of Dispersed Pt Catalysts in Liquid-Phase Selective Hydrogenation of 3-Nitrostyrene, Nitrobenzene, and Styrene

et al. 2014

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“…[1][2][3][4][5][6] Catalytic activity of the supported catalyst is dependent on not only the size of metal NPs but also the metal-support interaction. [7][8][9][10][11][12][13] Strong metal-support interaction in which metals are anchored on active transition metal oxides such as TiO 2 , 14-19 CeO 2 , 20-24 and Fe 2 O 3 25-27 provides high activity for several reactions such as hydrogenation, [28][29][30] CO oxidation, [31][32][33][34][35] and water-gas shift reaction. [36][37][38][39] The underlying origin of the metal-support interaction and the promotional role of the active oxide supports in enhancing the catalytic activity and selectivity have thus been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Confined Pt and CoFe₂O₄Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Kang¹,

Eum²,

Lee³

et al. 2011

Bulletin of the Korean Chemical Society

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Confined Pt and CoFe 2 O 4 nanoparticles (NPs) in a mesoporous core/shell silica microsphere, Pt-CoFe 2 O 4 @meso-SiO 2 , were prepared using a bi-functional linker molecule. A large number of Pt NPs in Pt-CoFe 2 O 4 @meso-SiO 2 , ranging from 5 to 8 nm, are embedded into the shell and some of them are in close contact with CoFe 2 O 4 NPs. The hydrogenation of cyclohexene over the Pt-CoFe 2 O 4 @meso-SiO 2 microsphere at 25 o C and 1 atm of H 2 yields cyclohexane as a major product. In addition, it gives oxygenated products. Control experiments with 18O-labelled water and acetone suggest that surface-bound oxygen atoms in CoFe 2 O 4 are associated with the formation of the oxygenated products. This oxidation reaction is operative only if CoFe 2 O 4 and Pt NPs are in close contact. The Pt-CoFe 2 O 4 @meso-SiO 2 catalyst is separated simply by a magnet, which can be re-used without affecting the catalytic efficiency.

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“…[17,18] This phenomenoni sk nown to modifyt he selectivity and activity of ac atalyst. [19,20] Therefore, significant alteration in the selectivity of the pairwisea ddition of hydrogen for titania-supportedc atalysts described above is not surprising. [11][12][13] One plausible explanation for the nature of the SMSI effect is the electronic interaction between the metal and the support, which leads to the formation of an electron-rich metal.…”

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Strong Metal–Support Interactions for Palladium Supported on TiO₂ Catalysts in the Heterogeneous Hydrogenation with Parahydrogen

et al. 2015

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Parahydrogen-induced polarization (PHIP) was successfully utilized to demonstrate the strong metal-support interaction (SMSI) effect for palladium supported on titania catalysts. Heterogeneous hydrogenation of 1,3-butadiene over Pd/TiO 2 catalysts led to the formation of 1-and 2-butenes and butane, and hyperpolarized products were obtained if parahydrogen was used in the reaction. However,i fthe catalysts were reduced in H 2 flow at 500 8Cb efore the hydrogenation reaction, the observed polarization levels were significantly lower or even zero, which was indicative of the suppression of the pairwise addition of hydrogen route. This observation indicated the possibility to detect the SMSI effect by the PHIP technique. Moreover, by using X-ray photoelectron spectroscopy it wass hown that Pd is partially presentasPd d + after reduction under ahydrogen atmosphere at 500 8C. These results were confirmed by transmissione lectron microscopy,w hich revealed the formation of Pd d + and the dissolution of Pd in the titania lattice.The hydrogenation of unsaturated compounds with parahydrogen leads to the observation of the parahydrogen-induced polarization (PHIP) phenomenon. [1,2] This resultsi nas ignificant enhancement in the NMR signals of the corresponding reaction products or intermediates. In the case of homogeneous catalytic hydrogenation, as ingle metal center often plays the role of the active site for hydrogen activation, and therefore, the pairwise hydrogen addition route is the major mechanism for such processes. [3,4] In contrast, heterogeneous pairwise addition of hydrogen is uncommon. Nevertheless, it can be successfully observed by the PHIP technique, [5][6][7] contrary to the implications of the Horiuti-Polanyi mechanism [8] widely accepted for ab road range of supported metal nanoparticles. Therefore, understanding the nature of active sites that can add two hydrogen atoms from the same hydrogen molecule as ap air to asubstrate molecule is ah ighly important task. [9][10][11] Recently,i tw as shown that the nature of the catalyst support can have as ignificant impact on the rate of the pairwise addition of hydrogen. [12,13] Remarkably,t itania-supported metal catalysts were shown to exhibit much higher levels of the pairwise addition of hydrogen (and larger PHIP effects) relative to that exhibited by metals on other supports. [9,14] Therefore, examination of the nature of the active sites for titania-supported nanoparticles in the contexto ft he pairwise addition of hydrogen may open up new possibilities for the rational preparation of catalysts that are able to maximize the observed PHIP effects and for the production of hyperpolarizedm olecular contrast agents potentially suitable for in vivo magnetic resonance imaging investigations. [14][15][16] In catalysis, it is well known that metals supported on titania exhibit the strong metal-support interaction (SMSI) effect. [17,18] This phenomenoni sk nown to modifyt he selectivity and activity of ac atalyst. [19,20] Therefore, significant alteration in the s...

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A comparative study of strong metal–support interaction and catalytic behavior of Pd catalysts supported on micron- and nano-sized TiO2 in liquid-phase selective hydrogenation of phenylacetylene

Cited by 53 publications

References 34 publications

Influence of Crystallite Size of TiO2 Supports on the Activity of Dispersed Pt Catalysts in Liquid-Phase Selective Hydrogenation of 3-Nitrostyrene, Nitrobenzene, and Styrene

Influence of Crystallite Size of TiO2 Supports on the Activity of Dispersed Pt Catalysts in Liquid-Phase Selective Hydrogenation of 3-Nitrostyrene, Nitrobenzene, and Styrene

Confined Pt and CoFe₂O₄Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Strong Metal–Support Interactions for Palladium Supported on TiO₂ Catalysts in the Heterogeneous Hydrogenation with Parahydrogen

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A comparative study of strong metal–support interaction and catalytic behavior of Pd catalysts supported on micron- and nano-sized TiO2 in liquid-phase selective hydrogenation of phenylacetylene

Cited by 53 publications

References 34 publications

Influence of Crystallite Size of TiO2 Supports on the Activity of Dispersed Pt Catalysts in Liquid-Phase Selective Hydrogenation of 3-Nitrostyrene, Nitrobenzene, and Styrene

Influence of Crystallite Size of TiO2 Supports on the Activity of Dispersed Pt Catalysts in Liquid-Phase Selective Hydrogenation of 3-Nitrostyrene, Nitrobenzene, and Styrene

Confined Pt and CoFe2O4Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Strong Metal–Support Interactions for Palladium Supported on TiO2 Catalysts in the Heterogeneous Hydrogenation with Parahydrogen

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Product

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Confined Pt and CoFe₂O₄Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Strong Metal–Support Interactions for Palladium Supported on TiO₂ Catalysts in the Heterogeneous Hydrogenation with Parahydrogen