Adsorption of atomic hydrogen on alumina by hydrogen spillover

Kramer, R.; André, M.

doi:10.1016/0021-9517(79)90266-5

Cited by 278 publications

(82 citation statements)

References 23 publications

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“…Similar coverages have been found on alumina [ 16]. This value is two orders of magnitude higher than the 1016 atoms/m 2 typically reported for spill-over capacity [ 12,15,27]. However, these earlier studies were carried out on catalysts which had been calcined at relatively high temperatures, and/or reduced at high temperatures.…”

Section: Tpd Experimentsmentioning

confidence: 56%

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Role of spill-over hydrogen in the hydrogenolysis of neopentane

Modica¹,

Miller²,

Meyers³

et al. 1994

Catalysis Today

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A series of Pt/LTL zeolite catalysts with varying Pt loading and support acidity was studied by hydrogen temperature-programmed desorption (TPD) and reaction of neopentane and propane. Specific desorption peaks in the TPD were associated with hydrogen spilled-over onto the support. The ability of the spilled-over hydrogen to migrate on the support surface was limited to approximately 35 nm from the platinum cluster. Saturation capacity for spilled-over hydrogen was related to the support acidity/basicity, with a maximum of about 1018 atoms/m 2 for the most acidic support studied. Spilled-over hydrogen was inert to oxygen treatment at 100°C, and did not contribute to catalytic activity for neopentane or propane conversion. Instead, hydrogenolysis TOF and the amount of spilledover hydrogen were mutually dependent on support acidity/basicity. Both declined with increasing K/AI ratio of the support, and continued to decline even for basic supports with K/A1 ratios greater than 1. The continued decline in activity for K/A1 > 1 indicates than the metal-support interaction is not dependent on acidic hydroxyls.

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Section: Tpd Experimentsmentioning

confidence: 56%

“…Kramer and Andre [ 15 ], studying Pt/alumina, identified a hydrogen desorption peak at around 450°C which was assigned to spilled-over hydrogen. A similar desorption peak was also observed on pure alumina when hydrogen was dissociated upstream of the catalyst bed by a high frequency discharge.…”

Section: Introductionmentioning

confidence: 99%

Role of spill-over hydrogen in the hydrogenolysis of neopentane

Modica¹,

Miller²,

Meyers³

et al. 1994

Catalysis Today

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“…Instead of the hydrogen spillover, atomic H(ad) species on alumina are also produced by hydrogen plasma even in the absence of metal [33]. Accordingly, the enhancement of the ammonia yield by the Ru-free alumina membrane may be attributable to the reactions of the N 2 (ad) molecules and the H(ad) atoms on the alumina.…”

Section: Speculations About the Formation Mechanism Of Ammoniamentioning

confidence: 94%

Tubular membrane-like catalyst for reactor with dielectric-barrier-discharge plasma and its performance in ammonia synthesis

Mizushima

Matsumoto

Sugoh

et al. 2004

Applied Catalysis A: General

103

119

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“…Usually, low temperature desorption peaks are assigned to hydrogen on metallic Pt [13]. High temperature desorption peaks are assigned to spillover hydrogen [14,15], to strongly chemisorbed hydrogen [16], to hydrogen in subsurface layers of the platinum [17]. It shows that addition of Ce and Zn promoters to Pt/c-Al 2 O 3 catalyst can greatly promote its ability to adsorb hydrogen, especially in the high temperature range.…”

Section: H 2 -Tpd and C 3 H 6 -Tpdmentioning

confidence: 97%

Propane dehydrogenation to propylene over Pt-based catalysts

et al. 2006

Catal Lett

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Propane catalytic dehydrogenation to propylene was investigated over novel platinum-based catalysts, and the BET, H 2 -chemisorption, H 2 -TPR, H 2 -TPD, C 3 H 6 -TPD and O 2 -pulse techniques were used for catalyst characterization in this paper. The results showed that the addition of Zn and Ce promoters into Pt-based catalyst could remarkably improve the performances of dehydrogenation. Highly propylene selectivity, about 99%, was obtained in the dehydrogenation reaction. This improvement in catalytic performances could be attributed to the strong surface interactions, which modified the surface properties of the active platinum metal and the support, and further improved the catalytic performance of Pt-based catalyst.

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Adsorption of atomic hydrogen on alumina by hydrogen spillover

Cited by 278 publications

References 23 publications

Role of spill-over hydrogen in the hydrogenolysis of neopentane

Role of spill-over hydrogen in the hydrogenolysis of neopentane

Tubular membrane-like catalyst for reactor with dielectric-barrier-discharge plasma and its performance in ammonia synthesis

Propane dehydrogenation to propylene over Pt-based catalysts

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