The adsorption of acetylene on rhodium-modified colloidal silver, a surface-enhanced Raman study

Feilchenfeld, H.; Luckier, Miguel; Efron, Leah; Willner, Bilha

doi:10.1016/0039-6028(92)90955-6

Cited by 5 publications

(2 citation statements)

References 53 publications

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“…Figure 2a shows the SHINER spectra during the reduction of RhCl 3 to Rh 0 . Before H 2 reduction, a Raman band at ∼310 cm −1 , assigned to Rh−Cl stretching vibrations from the RhCl 3 precursor, could be seen [27] . Upon reducing conditions and heating, the Raman band area decreased and after 30 min at 150 °C, a featureless spectral background in the region of 310–1000 cm −1 could be observed, indicating the formation of metallic Rh [10] …”

Section: Resultsmentioning

confidence: 99%

Operando Shell‐Isolated Nanoparticle‐Enhanced Raman Spectroscopy of the NO Reduction Reaction over Rhodium‐Based Catalysts

et al. 2021

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Operando shell‐isolated nanoparticle‐enhanced Raman spectroscopy (SHINERS) with on‐line mass spectrometry (MS) has been used to investigate the surface species, such as NO, NOH, NO2, N2O, and reaction products of the NO reduction reaction with CO and H2 over supported Rh‐based catalysts in the form of catalyst extrudates. By correlating surface intermediates and reaction products, new insights in the reaction mechanism could be obtained. Upon applying different reaction conditions (i. e., H2 or CO), the selectivity of the catalytic reaction could be tuned towards the formation of N2. Furthermore, in the absence of Rh, no reaction products were detected. The importance of the operando SHINERS as a surface‐sensitive characterization technique in the field of heterogeneous catalysis provides routes towards a better understanding of catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Operando Shell‐Isolated Nanoparticle‐Enhanced Raman Spectroscopy of the NO Reduction Reaction over Rhodium‐Based Catalysts

et al. 2021

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“…Sulfanilic [16] or citrate [31] ligands hampered only slightly the hydrogenation activity over Au/Pd [16] and Rh/Ag [31] clusters whereas phenantroline ligand shell significantly affected the hydrogenation behavior of the prepared Pd sol [32]. First we consider the activity data measured on Pd rich samples.…”

Section: Preparation Of Silica Supported Au-pd and Hydrogenation Of Amentioning

confidence: 99%

Controlled synthesis of PDDA stabilized Au–Pd bimetallic nanostructures and their activity in hydrogenation of acetylene

2007

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Pd hydrosol was synthesized by reducing PdCl 2 solution with dissolved H 2 in the presence of PDDA [poly(diallyldimethylammonium chloride)] as ionic stabilizer. O 2 treatment resulted in the reappearance of ligand to metal charge transfer bands of PdCl 4 2). Repeated oxidation and hydrogen treatments caused aggregation/agglomeration of the Pd particles yielding big spherical aggregates of 30-50 nm but still keeping the size of the 5-6 nm primary particles. Aggregation was attributed to the reduction of PdCl 4 2) anion having high local densities around Pd particles surrounded by PDDA polycation. Au-Pd bimetallic hydrosols were synthesized by reduction with 2-propanol and by pulse radiolysis technique in the presence of PDDA. Both reduction modes synthesize Au core-Pd shell structures. The mode of reduction was observed to affect the particle size and the thickness of the Au core and Pd shell. At the Au rich samples the differences in the optical spectra were attributed to different dispersions of the Au-Pd particles. Au-Pd bimetallic hydrosols were adsorbed on Aerosil 200 and the supported samples were tested in gas phase hydrogenation of acetylene.

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Surface-enhanced Raman scattering on colloidal nanostructures

Aroca

Alvarez-Puebla

Pieczonka

et al. 2005

Advances in Colloid and Interface Science

273

208

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The adsorption of acetylene on rhodium-modified colloidal silver, a surface-enhanced Raman study

Cited by 5 publications

References 53 publications

Operando Shell‐Isolated Nanoparticle‐Enhanced Raman Spectroscopy of the NO Reduction Reaction over Rhodium‐Based Catalysts

Operando Shell‐Isolated Nanoparticle‐Enhanced Raman Spectroscopy of the NO Reduction Reaction over Rhodium‐Based Catalysts

Controlled synthesis of PDDA stabilized Au–Pd bimetallic nanostructures and their activity in hydrogenation of acetylene

Surface-enhanced Raman scattering on colloidal nanostructures

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