Conversion of cyclohexene on a gold-plated palladium-nickel membrane catalyst

Aguilar, Guadalupe Valverde; Gryaznov, V. M.; Pavlova, L. F.; Yagodovski, V. D.

doi:10.1007/bf02061836

Cited by 9 publications

(2 citation statements)

References 4 publications

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“…Similar activity trends were observed in the dehydrogenation of cyclohexane on the same catalysts (33). On a palladium-nickel tube whose external surface was covered by gold, cyclohexane was dehydrogenated into benzene; the hydrogen formed in the course of the dehydrogenation reaction did not desorb into the gas phase but diffused through the palladium membrane and hydrogenated cyclohexene to cyclohexane (34). These findings agreewith Barlier experiments in which atomic hydrogen was supplied via diffusion through a palladium-silver membrane to a gold surface upon which cyclohexene was hydrogenated to cyclohexane (35,36).…”

Section: Palladium-goldsupporting

confidence: 81%

Gold in bimetallic catalysts

Schwank

1985

Gold Bull

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In spite ofits low intiinsic catalytic activity, gold can influence the activity and selectivity of group VIII metals, such as palladium, platinum and ruthenium. Gold-containing bimetallic catalysts have found important industsralapplications and rep resent an active researcharea forelucidatingthecorrelation between suifacestructureandcatalytic activity.Ina recent article in this journal the applications of elemental gold in heterogeneous catalysis were reviewed with emphasis on monometallic gold catalysts (1). In the present review, the application of gold as a component in bimetallic catalysts is discussed. Special attention is paid to examples of bimetallic catalysts where the addition of gold appears to increase the catalytic activity or significantly influence the selectivity of the catalyst.Early work on bimetallic catalysts aimed at correlating the catalytic behaviour and the electronic structure with alloy composition. Alloys of palladium, a group VIII metal having in excited states a partially unoccupied d-band, and gold with a completely filled d-band were studied (2 -6) and attempts were made to interpret the results on the basis of the rigid band theory.However, it turned out that the observed catalytic activities could not unambiguously be correlated with increasing occupancy of dbands in.the alloys as a function of gold content. More recently, strong arguments have been put forward in favour of localized effects in catalysis where the two metal components in an alloy retain more or less their individual electronic structures (7). Adding gold to an active group VIII metal makes it possible to study not only electronic but also structural effects in catalysis. In reactions which require certain ensembles or clusters of active metal atoms, the presence of gold atoms with intrinsically low catalytic activity can dilute or disrupt such ensembles of active surface atoms and thus cause precipitous drops in activity as a function of gold content. Under certain conditions, the gold induced changes in available active groupings of group VIII metal atoms can lead to different selectivities. Of course, it is not always possi bie to clearly disentangle structural from electronic or 'ligand' effects (8).The preparation of bimetallic catalysts is not restricted to metal components which are capable of forming solid solu tions over the full composition range, but can also include elements which have limited miscibility such as platinum and gold, or even complete immiscibility. An example of the Jatter type is the ruthenium-gold system. Bimetallic systems with limited bulk miscibility offer the intriguing opportunity of investigatingwhether the bulk miscibility limitations start to break down at very high metal dispersions. The term 'bimetallic clusters' (9) or 'bimetallic aggregates' has been coined to describe the as of yet not fully understood structures of the metal particles in these bimetallic catalysts.In the following, the effects of gold on the catalytic behaviour of palladium, platinum and ruthenium will b...

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Section: Palladium-goldsupporting

confidence: 81%

Gold in bimetallic catalysts

Schwank

1985

Gold Bull

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“…• dehydrogenation: 1,2-cyclohexanediol [41], 2-butanol [42], ammonia [43], butane [44], cis-3-hexen-1-ol [45], cyclohexane [46], cyclohexene [47], cyclohexanol [48], ethane [49], ethylbenzene [50], heptane [51], hydriodic acid [52], hydrogen sulphide [53], isoamylene [54], isobutane [55], isopropanol [56], methylcyclohexane [57], n-hexane [58], octane [58], propane [59], b-ionol [60], water [61]; • dry reforming of methane [62]; • oxidative dehydrogenation: ethane [63], isobutene [64], methane [65], methanol [66]);…”

Section: Development Of Inorganic Mrsmentioning

confidence: 99%

Hydrogen Production Using Pd-based Membrane Reactors for Fuel Cells

Basile

2008

Top Catal

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In this review, recent progress on palladiumbased membrane reactors (MRs) is outlined concentrating on the production of pure hydrogen. Various aspects are presented concerning some dehydrogenation reactions as well as an analysis of the palladium based membranes under study and the governing equations. Some critical aspects of non-palladium based membranes are presented. Moreover, some problems related to the effect of contamination of the Pd-based membranes and to the H 2 flux are introduced; the long-term durability problems of inorganic MRs are also discussed.

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Catalytic palladium‐based membrane reactors: A review

Shu¹,

Grandjean²,

et al. 1991

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Review Canada GIK 7P4This paper is an extensive review of the literature dealing with the class of catalytic membrane reactors which involves hydrogen permeable membranes made of palladium and palladium alloys. The fundamental factors which affect hydrogen permeability are first discussed. A classification of the many reactions which have been conducted in such reactors at both laboratory and commercial scales is then presented. The various techniques for the preparation of palladiumbased membranes are described and the literature on modeling and design of these reactors is also reviewed.Cet article passe en revue la littkrature relative B une classe de rkacteurs catalytiques z1 membranes utilisant des films de palladium ou d'alliages de palladium permtables a I'hydrogtne. On discute en premier lieu les facteurs qui affectent cette permeabilitk. On prCsente une classification des diverses rCactions et prockdes qui ont 6tC effectuCs dans de tels rtacteurs, au laboratoire et a I'kchelle commerciale. Les diverses techniques de prtparation des membranes 2 base de palladium sont dkcrites et on examine aussi la IittCrature portant sur la modClisation et la conception des rtacteurs.

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Conversion of cyclohexene on a gold-plated palladium-nickel membrane catalyst

Cited by 9 publications

References 4 publications

Gold in bimetallic catalysts

Gold in bimetallic catalysts

Hydrogen Production Using Pd-based Membrane Reactors for Fuel Cells

Catalytic palladium‐based membrane reactors: A review

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