Ligand Effects in SCILL Model Systems: Site‐Specific Interactions with Pt and Pd Nanoparticles

Sobota, Marek; Happel, Markus; Amende, Max; Paape, Natalia; Wasserscheid, Peter; Laurin, Mathias; Libuda, Jörg

doi:10.1002/adma.201004064

Cited by 98 publications

(158 citation statements)

References 35 publications

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“…[ 54 ] It should be kept in mind, however, that most surface science studies on IL interfaces have been performed on ex-situ prepared fi lms so far. In spite of the novelty of the fi eld, a broad spectrum of experimental methods have already been applied to IL fi lms, among which are X-ray photoelectron spectroscopy (XPS), [ 32-39 , 44 , 46-50 , 56 , 57 , 70 ] ultraviolet photoelectron spectroscopy (UPS), [ 33 , 35 , 40-42 , 70 ] infrared refl ection absorption spectroscopy (IRAS), [52][53][54][55] inverse photoelectron spectroscopy (IPES), [ 41 , 42 , 70 ] near edge X-ray absorption fi ne structure (NEXAFS), [ 41 ] metastable ion photoelectron spectroscopy (MIES), [33][34][35] direct recoil spectroscopy (DRS), [ 30 , 31 ] high-resolution electron energy loss spectroscopy (HREELS), [ 34 ] low energy ion scattering (LEIS), [ 32 ] time-of-fl ight secondary ion mass spectrometry (TOF-SIMS), [ 37 ] soft X-ray emission spectroscopy (SXES), [ 70 ] and Rutherford backscattering spectroscopy (RBS). [ 71 ] The number of studies is yet rather limited, however.…”

Section: Progress Reportmentioning

confidence: 99%

“…In very recent studies on Pt model catalysts, direct evidence for electronic ligand effects of the IL and material specifi c site-specifi ty have been found. [ 55 ] Whereas the IL remains molecularly intact at room temperature, partial decomposition occurs upon heating. Again the thermal behavior of [C 4 C 1 Im][Tf 2 N] fi lms on Pd/Al 2 O 3 /NiAl(110) was probed by IR spectroscopy of adsorbed CO. [ 53 ] In Figure 10 This behavior is in sharp contrast to adsorption on the pristine Al 2 O 3 support, where molecular adsorption and molecular desorption were observed.…”

Section: Il Interactions With Catalytically Active Nanoparticles-specmentioning

confidence: 99%

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Surface Science and Model Catalysis with Ionic Liquid‐Modified Materials

et al. 2011

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Materials making use of thin ionic liquid (IL) films as support-modifying functional layer open up a variety of new possibilities in heterogeneous catalysis, which range from the tailoring of gas-surface interactions to the immobilization of molecularly defined reactive sites. The present report reviews recent progress towards an understanding of "supported ionic liquid phase (SILP)" and "solid catalysts with ionic liquid layer (SCILL)" materials at the microscopic level, using a surface science and model catalysis type of approach. Thin film IL systems can be prepared not only ex-situ, but also in-situ under ultrahigh vacuum (UHV) conditions using atomically well-defined surfaces as substrates, for example by physical vapor deposition (PVD). Due to their low vapor pressure, these systems can be studied in UHV using the full spectrum of surface science techniques. We discuss general strategies and considerations of this approach and exemplify the information available from complementary methods, specifically photoelectron spectroscopy and surface vibrational spectroscopy.

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Section: Progress Reportmentioning

confidence: 99%

Section: Il Interactions With Catalytically Active Nanoparticles-specmentioning

confidence: 99%

Surface Science and Model Catalysis with Ionic Liquid‐Modified Materials

et al. 2011

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“…This well-ordered oxide film is widely used as a support for model catalyst preparation. [19][20][21][22][23] Due to its low thickness, charging effects during electron spectroscopy measurements are avoided. Pt is deposited on top of the Al 2 O 3 support via physical vapor deposition (PVD).…”

Section: Adsorption and Thermal Evolution On Supported Pt Particlesmentioning

confidence: 99%

Alkyl chain length-dependent surface reaction of dodecahydro-N-alkylcarbazoles on Pt model catalysts

Gleichweit

Amende

Bauer

et al. 2014

The Journal of Chemical Physics

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Articles you may be interested inPerformance and characteristics of a high pressure, high temperature capillary cell with facile construction for operando x-ray absorption spectroscopy Rev. Sci. Instrum. 85, 084105 (2014) The concept of liquid organic hydrogen carriers (LOHC) holds the potential for large scale chemical storage of hydrogen at ambient conditions. Herein, we compare the dehydrogenation and decomposition of three alkylated carbazole-based LOHCs, dodecahydro-N-ethylcarbazole (H 12 -NEC), dodecahydro-N-propylcarbazole (H 12 -NPC), and dodecahydro-N-butylcarbazole (H 12 -NBC), on Pt(111) and on Al 2 O 3 -supported Pt nanoparticles. We follow the thermal evolution of these systems quantitatively by in situ high-resolution X-ray photoelectron spectroscopy. We show that on Pt(111) the relevant reaction steps are not affected by the different alkyl substituents: for all LOHCs, stepwise dehydrogenation to NEC, NPC, and NBC is followed by cleavage of the C-N bond of the alkyl chain starting at 380-390 K. On Pt/Al 2 O 3 , we discern dealkylation on defect sites already at 350 K, and on ordered, (111)-like facets at 390 K. The dealkylation process at the defects is most pronounced for NEC and least pronounced for NBC. © 2014 AIP Publishing LLC.

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“…Such insights are available following an "IL surface science" approach, in which the IL layer is prepared on an atomically welldefined surface under ultrahigh vacuum (UHV) conditions [17][18][19][20][21][22][23][24]. Using a broad spectrum of techniques including, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Using a broad spectrum of techniques including, e.g. photoelectron spectroscopy, vibrational spectroscopy and scanning probe microscopy, it could be shown that ILs show very specific ion-surface interactions [23][24][25], may undergo interfacial reaction [25,26], and may form layered [27][28][29] and even ordered structures at noble metal surfaces [30][31][32][33][34][35][36]. On electrochemically controlled surfaces either the cation, or the anion or both are adsorbed at the electrode surface depending on the electrode potential [30,[32][33][34][35]37].…”

Section: Introductionmentioning

confidence: 99%