Particle size effects in the selective hydrogenation of cinnamaldehyde over supported palladium catalysts

Jiang, Feng; Cai, Jian; Liu, Bing; Xu, Yuebing; Liu, Xiaohao

doi:10.1039/c6ra17000e

Cited by 73 publications

(65 citation statements)

References 71 publications

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“…No cinnamyl alcohol was formed, as expected, and no other products were observed in the GC traces. The difference in selectivity could be caused by the larger Pd particles in the NaBH 4 ‐reduced sample . Alternatively, the selectivity difference could be explained by support effects, which could be introduced by a change in the nature of the functional groups caused by the activation method.…”

Section: Figurementioning

confidence: 99%

Influence of Metal Deposition and Activation Method on the Structure and Performance of Carbon Nanotube Supported Palladium Catalysts

2018

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The effects of the metal deposition and activation methods on metal particle size and distribution were investigated for carbon nanotube supported Pd catalysts. The Pd precursor was loaded by incipient wetness impregnation, ion adsorption, and deposition precipitation and was activated by thermal treatment under a nitrogen atmosphere or in the liquid phase by reduction by formaldehyde or sodium borohydride. Regardless of the metal precursor loading method, activation under a N2 atmosphere at 500 °C led to homogeneously distributed 4 nm Pd particles. Liquid‐phase reduction by sodium borohydride provided a bimodal distribution with particle sizes of approximately 1 and >10 nm. A somewhat weaker reducing agent, formaldehyde, yielded particles approximately 1 nm in size. The activities of the catalysts for the hydrogenation of cinnamaldehyde correlated with the particle sizes.

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Section: Figurementioning

confidence: 99%

Influence of Metal Deposition and Activation Method on the Structure and Performance of Carbon Nanotube Supported Palladium Catalysts

2018

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“…As observed above, the Pd 1+NPs /TiO 2 synergistic catalyst present more than twice reactivity of simple Pd 1 /TiO 2 and Pd NPs /TiO 2 catalysts. According to Crook et al's work51,52 and the working mechanism of Pd 1 atoms and NPs, the size of Pd NPs and ratio of Pd NPs/ Pd 1 sites would affect the hydrogenation performance of Pd 1+NPs / TiO 2 catalyst.The universality and stability of Pd 1+NPs /TiO 2 catalysts. The high activity is also confirmed by the hydrogenation of other ketone/aldehydes(Table 1andSupplementary Figs.…”

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confidence: 99%

Titania supported synergistic palladium single atoms and nanoparticles for room temperature ketone and aldehydes hydrogenation

et al. 2020

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Selective reduction of ketone/aldehydes to alcohols is of great importance in green chemistry and chemical engineering. Highly efficient catalysts are still demanded to work under mild conditions, especially at room temperature. Here we present a synergistic function of singleatom palladium (Pd 1 ) and nanoparticles (Pd NPs ) on TiO 2 for highly efficient ketone/aldehydes hydrogenation to alcohols at room temperature. Compared to simple but inferior Pd 1 /TiO 2 and Pd NPs /TiO 2 catalysts, more than twice activity enhancement is achieved with the Pd 1+NPs /TiO 2 catalyst that integrates both Pd 1 and Pd NPs on mesoporous TiO 2 supports, obtained by a simple but large-scaled spray pyrolysis route. The synergistic function of Pd 1 and Pd NPs is assigned so that the partial Pd 1 dispersion contributes enough sites for the activation of C=O group while Pd NPs site boosts the dissociation of H 2 molecules to H atoms. This work not only contributes a superior catalyst for ketone/aldehydes hydrogenation, but also deepens the knowledge on their hydrogenation mechanism and guides people to engineer the catalytic behaviors as needed.

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“…On the other hand, Pd [12,[21][22][23][24], Ni [25], Rh [26], Pt [9], Pt-Au [9] are selective for the hydrogenation of C=C to form saturated aldehyde. Literature report also shows that smaller Pd particle is selective towards C=C hydrogenation, forming HCAL, while larger Pd particle is selective towards C=O hydrogenation, forming HCOL [27]. Espro et al have also demonstrated the C=O bond selectivity of Pd-based catalysts in CAL hydrogenation under mild conditions [28].…”

Section: Introductionmentioning

confidence: 89%

“…Various attempts have been made to develop a suitable catalyst system for the selective (C=C vs. C=O) hydrogenation of CAL both in the gas-phase and in the liquid-phase [16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Chemoselective hydrogenation of cinnamaldehyde at atmospheric pressure over combustion synthesized Pd catalysts

Das

Pal

Llorca

et al. 2017

Reac Kinet Mech Cat

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Particle size effects in the selective hydrogenation of cinnamaldehyde over supported palladium catalysts

Abstract: Palladium particles of different sizes obtained directly and indirectly by various methods were studied to clarify the particle size effect in the selective hydrogenation of cinnamaldehyde (CAL).

Cited by 73 publications

References 71 publications

Influence of Metal Deposition and Activation Method on the Structure and Performance of Carbon Nanotube Supported Palladium Catalysts

Influence of Metal Deposition and Activation Method on the Structure and Performance of Carbon Nanotube Supported Palladium Catalysts

Titania supported synergistic palladium single atoms and nanoparticles for room temperature ketone and aldehydes hydrogenation

Chemoselective hydrogenation of cinnamaldehyde at atmospheric pressure over combustion synthesized Pd catalysts

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