PdC formation in ultra-thin Pd membranes during separation of H2/CO mixtures

Li, Hui; Goldbach, Andreas; Li, Wenzhao; Xu, Hengyong

doi:10.1016/j.memsci.2007.04.034

Cited by 119 publications

(66 citation statements)

References 30 publications

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“…On the other hand, Li et al [15] reported the formation of a Pd 1−x C x phase in Pd membranes during separation of H 2 /CO mixtures, and the reversible incorporation of carbon into palladium. By treatment with H 2 the carbon may be removed.…”

Section: Introductionmentioning

confidence: 99%

The influence of the nanostructure on the effect of CO2 on the properties of Pd–Ag thin-film for H2 separation

Abate

Centi

et al. 2011

Applied Catalysis A: General

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Dedicated to the friend Helmut Knözinger on in the occasion of his 75 th birthday for the seminal contribution to the advancement of fundamental knowledge on catalysis. AbstractThe use of co-deposition instead of sequential deposition during the preparation of Pd-Ag thin films by electroless plating deposition leads to two different nanostructures, e.g. a dendritic nanostructure or a more compact and dense film, allowing to analyze the role of this parameter, at equal membrane composition, on the performances. In pure H2 the permeability to hydrogen of the second type of thin films is 3-4 times higher, but the presence of CO2 in the feed changes considerably the performances. The results are tentatively interpreted on the basis of a non-permanent in situ modification of the characteristics of the Pd-Ag thin films, with creation of strains and microholes particularly enhanced for the nanostructure present in the sample prepared by co-deposition. These strains and microholes are suggested to derive from the combined effect of CO2 (with creation of subsurface O and/or C) and of hydrogen diffusion through the thin film, which induces lattice expansion and stress on the nanograins. When the flux of H2 stops, there is a relatively rapid restoring of the initial situation. Scanning electron microscopy (SEM) characterization after the tests in the presence of CO2 indicates the presence of desintering consistently with above indications and the creation of crack like voids.

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Section: Introductionmentioning

confidence: 99%

The influence of the nanostructure on the effect of CO2 on the properties of Pd–Ag thin-film for H2 separation

Abate

Centi

et al. 2011

Applied Catalysis A: General

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“…The set up for permeation and alloying experiments has been elsewhere described [18]. The membrane tube was mounted with a graphite gasket and a Teflon O-ring at its cold end into a 20 mm wide separator shell which was placed inside a furnace with programmable temperature controller.…”

Section: Permeation Measurementsmentioning

confidence: 99%

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

Zeng

Goldbach

Shi

et al. 2012

International Journal of Hydrogen Energy

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“…No XPS lines attributed to silver or iron were detected in the surface analysis of the membrane after the reaction. Li et al reported formation of PdC on palladium membranes in a mixture of carbon monoxide (20-33%) and hydrogen [68]. However, no significant C 1 s line was recorded in XPS except that of carbon contamination.…”

Section: Hydrogen Flux Of Palladium Membranementioning

confidence: 99%

Methane Steam Reforming in Hydrogen-permeable Membrane Reactor for Pure Hydrogen Production

Matsumura

Tong

2008

Top Catal

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Steam reforming of methane over a ruthenium catalyst has been carried out at 500°C in a membrane reactor equipped with a palladium membrane supported on a porous stainless steel tube. Hydrogen and carbon dioxide are mainly produced in the reaction, while hydrogen is selectively permeated through the membrane. Since equilibrium-shift takes place by hydrogen separation from the reaction mixture, the methane conversion significantly exceeds the equilibrium value, which is low at 500°C. The selectivity to carbon monoxide by-produced in the reaction is lower than that expected from the equilibrium. Although the equilibrium conversion decreases with an increase in the reaction pressure, the conversion with the membrane reactor can increase because the hydrogen separation is promoted by the pressure increase. The catalytic activity is an important factor to produce a sufficiently high methane conversion and it is enhanced at a high reaction pressure.

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PdC formation in ultra-thin Pd membranes during separation of H2/CO mixtures

Cited by 119 publications

References 30 publications

The influence of the nanostructure on the effect of CO2 on the properties of Pd–Ag thin-film for H2 separation

The influence of the nanostructure on the effect of CO2 on the properties of Pd–Ag thin-film for H2 separation

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

Methane Steam Reforming in Hydrogen-permeable Membrane Reactor for Pure Hydrogen Production

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