The effect of particle size, morphology and support on the formation of palladium hydride in commercial catalysts

Parker, Stewart F.; Walker, H. C.; Callear, Samantha K.; Grünewald, Elena; Petzold, Theodor Dierk; Wolf, Dorit; Möbus, Konrad; Adam, Jacques; Wieland, S.; Jiménez‐Ruiz, Mónica; Albers, Peter

doi:10.1039/c8sc03766c

Cited by 50 publications

(66 citation statements)

References 47 publications

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“…This structure has 18 on‐top, 44 twofold, 18 threefold, 0 fourfold coordinated hydrogen and no subsurface hydrogen. The last observation is consistent with the extremely small solubility of hydrogen in platinum, in marked in contrast to the high hydrogen storage capability of palladium, irrespective of whether it is a metal black or supported nanoparticles.…”

Section: Figuresupporting

confidence: 75%

Adsorbed States of Hydrogen on Platinum: A New Perspective

Parker

Mukhopadhyay

Jiménez‐Ruiz

et al. 2019

Chemistry A European J

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The interaction of hydrogen with platinum is enormously important in many areas of catalysis. The most significant of these are in polymer electrolyte membrane fuel cells (PEMFC), in which carbon‐supported platinum is used to dissociate hydrogen gas at the anode. The nature of adsorbed hydrogen on platinum has been studied for many years on single‐crystal surfaces, on high‐surface area‐platinum metal (Raney platinum and platinum black), and on supported catalysts. Many forms of vibrational spectroscopy have played a key role in these studies, however, there is still no clear consensus as to the assignment of the spectra. In this work, ab initio molecular dynamics (AIMD) and lattice dynamics were used to study a 1.1 nm nanoparticle, Pt44H80. The results were compared to new inelastic neutron scattering spectra of hydrogen on platinum black and of a carbon‐supported platinum fuel cell catalyst and an assignment scheme that rationalises all previous data is proposed.

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Section: Figuresupporting

confidence: 75%

Adsorbed States of Hydrogen on Platinum: A New Perspective

Parker

Mukhopadhyay

Jiménez‐Ruiz

et al. 2019

Chemistry A European J

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“…161,162 Pd NPs, for instance, show high reactivity towards H 2 activation [163][164][165][166] as palladium is known to adsorb up to 900 times its own volume. 167,168 Thus, the (chemo)-selectivity of these nanomaterials towards hydrogenation is highly controlled by surface interactions with the modifiers/stabilizers, the substrates or even the supports. 169,170 In this section, we describe the use of palladium nanoparticles as hydrogenation catalysts in supported catalysts, 173 and iii) solvents.…”

Section: Hydroxyl Compounds From Natural Sourcesmentioning

confidence: 99%

Palladium Nanoparticles in Polyols: Synthesis, Catalytic Couplings, and Hydrogenations

2019

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Alcohols, in particular polyols, are well-known for the synthesis of metal nanoparticles often acting as reducing agents, solvents, and stabilizers. Given not only their structural flexibility depending on the number of OH functions and their inherent H bonding interactions, but also the wide range of polyol molecular weights readily available, different physico-chemical properties (boiling point, polarity, viscosity) could be exploited towards the synthesis of well-defined nanomaterials. In particular, the relevance of the supramolecular structure of polyols has a fundamental impact on the formation of metal nanoparticles thereby favoring the dispersion of the nanoclusters. In the field of the metal-based nanocatalysis, palladium occupies a privileged position mainly due to its remarkable versatility in terms of reactivity representing a foremost tool in synthesis. In this review, we describe the controlled synthesis of Pd-based nanoparticles in polyol medium focusing on the progress in terms of tailoring size, morphology, structure, and surface state. Moreover, we discuss the use of 4.2. C(sp)-C(sp 2) Sonogashira cross-coupling 4.3. C(sp 2)-C(sp 2) Hiyama-Denmark cross-coupling 4.4. C(sp 2)-C(sp 2) Heck-Mizoroki cross-coupling 4.5. C(sp 2)-C(sp 2 /sp 3) Suzuki-Miyaura cross-coupling 4.5.1. In PEG and glycerol media 4.5.2. Solid-supported nanocatalysts 4.6. C(sp 2)-C(sp 2)-C(sp 2) Carbonylative Suzuki cross-coupling 4.7. C(sp 2)-C(sp 2) Ullmann-type homo-coupling 4.8. Miscellaneous: SiN and C-N amination reactions 5. Conclusions and outlook

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“…65 Pd interactions with hydrogen situated in octahedral sites of the fcc Pd lattice are already well known. 49,66 These interactions depend on the exposed Pd surface of the catalyst, 67 reaction temperature, amount of hydrogen and may influence the catalytic activity. 68 The formation of the PdH x phase and the disappearance of the PdO on the Pd/AC was observed already after the 1st reaction cycle, with the PdH x phase formation increasing over repetitive reaction cycles.…”

Section: Catalysis Science and Technologymentioning

confidence: 99%

Directing nitrogen-doped carbon support chemistry for improved aqueous phase hydrogenation catalysis

Bosilj

Rustam

Thomann

et al. 2020

Catal. Sci. Technol.

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The effect of particle size, morphology and support on the formation of palladium hydride in commercial catalysts

Abstract: The influence of the support on the quantity of hydrogen present in a supported palladium catalyst is characterised. The on-top hydrogen on β-PdH is observed for the first time.

Cited by 50 publications

References 47 publications

Adsorbed States of Hydrogen on Platinum: A New Perspective

Adsorbed States of Hydrogen on Platinum: A New Perspective

Palladium Nanoparticles in Polyols: Synthesis, Catalytic Couplings, and Hydrogenations

Directing nitrogen-doped carbon support chemistry for improved aqueous phase hydrogenation catalysis

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