Rh1−x Pd x Nanoparticle Composition Dependence in CO Oxidation by NO

Renzas, Russ; Huang, Wenyu; Zhang, Yawen; Graß, Michael; Somorjai, Gábor A.

doi:10.1007/s10562-010-0462-5

Cited by 31 publications

(47 citation statements)

References 39 publications

(62 reference statements)

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“…[1] Specific examples include the systems of Fe-Ru for efficient Fischer-Tropsch synthesis, [2] Al-Fe as aP d-free hydrogenation catalyst, [3] Rh-Pd for selectiveC Oo xidation, [4] and Pt-Co for renewable fuel generation [5] or the activation of Au in bimetallic systems. [6] Several studies have also demonstrated that bimetallic nanoparticles can outperform their monometallic counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…[6] Several studies have also demonstrated that bimetallic nanoparticles can outperform their monometallic counterparts. [2][3][4][5][6][7] Specific intermetallic interactions in these alloyed or core-shell-type systemsw ere postulated to resulti ns ynergistic effects. This can include at uned electronic or geometric structure as well as an improved thermal or chemical stability.…”

Section: Introductionmentioning

confidence: 99%

“…As ar esult, bimetallicnanocatalysts did not only display the combined properties of the pure components but rather exhibit as ignificantly higher catalytic performance in terms of activity,s electivity, and so on. [2][3][4][5][6][7] In some cases, the catalytic performance could be improved even if one of the constituents was less active or even inactive for ac ertain reaction.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] Therefore, the alloyingo fp recious metals with an abundant, less-precious metal is of particular interestn ot only to improvet he catalytic properties but also for effective cost reduction. [8] In contrastt ob imetallic M-Pd or M-Pt systems (M:m etal), bimetallic systems of Ir and Os have been barely addressed, in general.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, 1-octene was selected because of its lows teric hindrance and simple chemical structure. The second example, cinnamalBimetallic NiIr 4 and NiOs 4 alloy nanoparticles are prepared and studied with regard to their performance in catalytic hydrogenation reactions. NiIr 4 and NiOs 4 nanoparticles are obtained by oleylamine-driven reduction and exhibit mean diameters of (8.9 AE 1.3) and (6.8 AE 1.4) nm at low agglomeration.…”

Section: Introductionmentioning

confidence: 99%

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Bimetallic Nickel‐Iridium and Nickel‐Osmium Alloy Nanoparticles and Their Catalytic Performance in Hydrogenation Reactions

et al. 2017

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Bimetallic NiIr4 and NiOs4 alloy nanoparticles are prepared and studied with regard to their performance in catalytic hydrogenation reactions. NiIr4 and NiOs4 nanoparticles are obtained by oleylamine‐driven reduction and exhibit mean diameters of (8.9±1.3) and (6.8±1.4) nm at low agglomeration. The phase composition was determined in detail by using different methods, which include high‐resolution TEM, scanning transmission electron microscopy, selected‐area electron diffraction, X‐ray diffraction, and energy‐dispersive X‐ray spectroscopy. This and results in a uniform distribution of both metals Ni‐Ir and Ni‐Os with a ratio of 1:4. The catalytic performance of the NiIr4 and NiOs4 nanoparticles for hydrogenation reactions is evaluated using three selected model substrates: 1‐octene, cinnamaldehyde, and diphenylacetylene. Similar sized Ni, Ir, and Os nanoparticles were used as references. Most remarkable are the excellent selectivity of NiOs4 in the hydrogenation of cinnamaldehyde and the promising formation of (Z)‐stilbene in terms of conversion activity and selectivity. The alloying of Ir and Os with Ni, moreover, is highly cost efficient. In general, both bimetallic alloy nanoparticles, NiIr4 and NiOs4, are shown here for the first time in terms of synthesis, composition, and catalytic hydrogenation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bimetallic Nickel‐Iridium and Nickel‐Osmium Alloy Nanoparticles and Their Catalytic Performance in Hydrogenation Reactions

et al. 2017

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Optimally designed synthesis of advanced Pd‐Rh bimetallic three‐way catalyst

Chen²,

et al. 2019

Can J Chem Eng

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For Pd‐Rh bimetallic three‐way catalysts, appropriate Pd‐Rh interaction is of significant importance to the catalytic activity. In this work, an optimally designed approach was utilized to synthesize Pd‐Rh bimetallic catalyst supported on CeO2‐ZrO2‐Al2O3 (Rh/CZ/Pd/A), which was compared with the conventional catalysts prepared by mechanical mixing method and co‐impregnation technique. In Rh/CZ/Pd/A, Rh species are distributed on the external surface of CZ, while Pd species are distributed in the inner layer. Upon the application of the hydrothermal aging treatment, Pd species undergo migration to the outer sphere of CZ grains. Meanwhile, modified Pd‐Rh interaction and metal‐support interaction are obtained, which are efficient for stabilizing PdO and Rh2O3 at high temperatures, as well as suppressing the deactivation of Rh species by diffusing into the support. Overall, smaller size, better dispersion, along with the higher oxidation state of Pd species and the more reducible oxidation state of Rh species are maintained for Rh/CZ/Pd/A‐a. Consequently, improved three‐way catalytic activity is achieved for Rh/CZ/Pd/A especially after the hydrothermal aging treatment.

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