2020
DOI: 10.1039/d0sc00875c
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Structural trends in the dehydrogenation selectivity of palladium alloys

Abstract: Alloying is well-known to improve the dehydrogenation selectivity of pure metals, but there remains considerable debate about the structural and electronic features of alloy surfaces that give rise to this behavior.

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Cited by 36 publications
(50 citation statements)
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“…Importantly, it suggests that the aggregated iron species (such as Fe 2 O 3 , FeO x S y , FeS) are not as active as dispersed Fe sites. It is generally accepted that propane conversion to propylene can occur over an individual active site of noble metal/metal alloys (such as Pt or Pd) and is a structure-insensitive reaction, whereas large ensembles of active sites can also induce structure-sensitive side reactions. , It implies that the rate of PDH reaction strongly depends on the number of the active sites, and thus, the rate is directly proportional to the number of exposed atoms. Previously, Kim and Wachs studied vanadium oxide catalysts with different VO x loading for selective methanol oxidation to formaldehyde .…”
Section: Resultsmentioning
confidence: 99%
“…Importantly, it suggests that the aggregated iron species (such as Fe 2 O 3 , FeO x S y , FeS) are not as active as dispersed Fe sites. It is generally accepted that propane conversion to propylene can occur over an individual active site of noble metal/metal alloys (such as Pt or Pd) and is a structure-insensitive reaction, whereas large ensembles of active sites can also induce structure-sensitive side reactions. , It implies that the rate of PDH reaction strongly depends on the number of the active sites, and thus, the rate is directly proportional to the number of exposed atoms. Previously, Kim and Wachs studied vanadium oxide catalysts with different VO x loading for selective methanol oxidation to formaldehyde .…”
Section: Resultsmentioning
confidence: 99%
“…However, as the intermediates become more deeply dehydrogenated, they prefer to maximize their interaction with Pd atoms by stabilizing themselves on Pd–Pd bridge sites. These conclusions for deeply dehydrogenated intermediates are in agreement with results reported for 1:1 PdZn and PdIn terrace surfaces in our previous work . On the other hand, on the Pd-step(210)_PdIn, all intermediates, regardless of the degree of dehydrogenation, prefer to bind to the Pd atoms along the undercoordinated edge.…”
Section: Resultsmentioning
confidence: 65%
“…The model is run as a CSTR at a temperature of 873 K and a pressure of 1 atm. The reactor dimensions and volumetric flow rates (Table S18) are chosen to match experimental conditions, , while the catalyst surface area is varied to adjust the conversion of propane. Further information regarding the details of the microkinetic model can be found in the Supporting Information (SI section 12).…”
Section: Methodsmentioning
confidence: 99%
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“…This flexibility is demonstrated in the context of two catalytic systems that are relevant to practical electrocatalytic applications and that represent the typical complexities encountered when developing computational models of heterogeneous catalysts. The first case treats high coverage configurations of the adsorbate NO* on a Pt3Sn(111) terrace surface, wherein a vast surface configurational space resulting from both the reduction in the catalyst surface symmetry due to alloying [27][28][29][30] and the strong binding nature of NO* yields rich catalytic behavior.…”
Section: Introductionmentioning
confidence: 99%