On alloying and low-temperature stability of thin, supported PdAg membranes

Zeng, Gaofeng; Goldbach, Andreas; Shi, Lei; Xu, Hengyong

doi:10.1016/j.ijhydene.2011.12.126

Cited by 40 publications

(32 citation statements)

References 25 publications

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“…The apparent activation energy for hydrogen permeation (E act ) for a cold-rolled Pd-Ag foil of a given Ag composition can be easily computed and these values are available in the literature [23]. Based on the Ag composition of a Pd-Ag composite membrane and a cold-rolled foil of similar Ag composition, it was shown that the apparent E act can be used as an in situ parameter to judge the extent of annealing for sequentially plated bi-layer Pd-Ag composite membranes [23]. It was also shown that once a Pd-Ag membrane was annealed there was no further change in the apparent E act .…”

Section: Introductionmentioning

confidence: 99%

Rapid annealing of sequentially plated Pd-Au composite membranes using high pressure hydrogen

Patki

Lundin

Way

2016

Journal of Membrane Science

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In this work, the time-consuming process of annealing Pd-Au alloy composite membranes, fabricated by sequential electroless plating, has been revisited. Composite Pd-Au/YSZ membranes approximately 5 µm thick with compositions ranging from 8 wt% to 10 wt% Au were fabricated by the bi-layer fabrication technique. Using these membranes, we investigated the effect of changing the pressure of the annealing gas (H 2) on annealing time at temperatures between 450 °C and 550 °C. X-ray diffraction (XRD) was used to study the progress of annealing, where it was observed that a ~10 wt% Au membrane could be annealed in 9 h at 550 °C and 3 MPa H 2 whereas it took 120 h to anneal a similar membrane at 550 °C and 0.1 MPa H 2. Another ~10 wt% Au membrane was annealed in less than 2 days at 450 °C and 3 MPa H 2. Complete annealing was confirmed using energy dispersive x-ray spectroscopy (EDS) with multiple spot scans throughout the thickness of the membrane indicating a uniform Au composition. Additionally, it was found that the apparent activation energy for hydrogen permeation (E act) could be used as an in situ parameter to judge the extent of annealing. In this technique, apparent E act decreases as the membrane anneals, reaching a minimum value which is characteristic of its Au composition. Additional annealing time does not further change the apparent E act for a membrane with a homogeneous Au distribution.

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Section: Introductionmentioning

confidence: 99%

Rapid annealing of sequentially plated Pd-Au composite membranes using high pressure hydrogen

Patki

Lundin

Way

2016

Journal of Membrane Science

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“…Before plating the supports were cleaned sequentially by ethanol, 4% aqueous KOH solution and deionized water and well Pd seeding activated [34]. In a typical process, 60 mL Pd bath was loaded into a glass container and 15 mL Ag bath in a syringe.…”

Section: Preparation Of Pd-ag/ceramic Membranementioning

confidence: 99%

Environmentally benign synthesis of amides and ureas via catalytic dehydrogenation coupling of volatile alcohols and amines in a Pd-Ag membrane reactor

Chen

Zeng

Lai

et al. 2016

Journal of Membrane Science

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a b s t r a c tIn this study, we report the direct synthesis of amides and ureas via the catalytic dehydrogenation of volatile alcohols and amines using the Milstein catalyst in a Pd-Ag/ceramic membrane reactor. A series of amides and ureas, which could not be synthesized in an open system by catalytic dehydrogenation coupling, were obtained in moderate to high yields via catalytic dehydrogenation of volatile alcohols and amines. This process could be monitored by the hydrogen produced. Compared to the traditional method of condensation, this catalytic system avoids the stoichiometric pre-activation or in situ activation of reagents, and is a much cleaner process with high atom economy. This methodology, only possible by employing the Pd-Ag/ceramic membrane reactor, not only provides a new environmentally benign synthetic approach of amides and ureas, but is also a potential method for hydrogen storage.

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“…Therefore, if the generated H 2 can be selectively separated in situ from the reaction mixtures, one will be able to drive the reaction to completion. In this regard, supported Pd‐based composite membranes are the most applicable candidates for selective hydrogen removal owing to their high and exclusive hydrogen permeability, high thermal stability, moderate chemical resistance, and mechanical strength 10–15. Such a membrane‐reactor concept has been explored previously for ethanol dehydrogenation with limited success 13.…”

Section: Esterification Of Primary Alcohols With Pnn–ruii Complexes[a]mentioning

confidence: 99%

“…In this regard, supported Pdbased composite membranes are the most applicable candidates for selective hydrogen removal owing to their high and exclusive hydrogen permeability, high thermal stability, moderate chemical resistance, and mechanical strength. [10][11][12][13][14][15] Such a membrane-reactor concept has been explored previously for ethanol dehydrogenation with limited success. [13,16,17] Beller and co-workers recently reported that up to 81 % yield could be achieved for the dehydrogenation of EtOH to EA with a more reactive Ru catalyst at 90 8C.…”

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confidence: 99%

A Green Approach to Ethyl Acetate: Quantitative Conversion of Ethanol through Direct Dehydrogenation in a Pd–Ag Membrane Reactor

Zeng

Chen

et al. 2012

Chemistry A European J

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On alloying and low-temperature stability of thin, supported PdAg membranes

Cited by 40 publications

References 25 publications

Rapid annealing of sequentially plated Pd-Au composite membranes using high pressure hydrogen

Rapid annealing of sequentially plated Pd-Au composite membranes using high pressure hydrogen

Environmentally benign synthesis of amides and ureas via catalytic dehydrogenation coupling of volatile alcohols and amines in a Pd-Ag membrane reactor

A Green Approach to Ethyl Acetate: Quantitative Conversion of Ethanol through Direct Dehydrogenation in a Pd–Ag Membrane Reactor

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