Trial designs of ultra-thin palladium alloy membrane purifiers for high-density hydrogen production Pt. 2

Chen, Chee; Gobina, Edward

doi:10.1016/s0958-2118(13)70015-6

Cited by 3 publications

(2 citation statements)

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“…Hydrogen, which at the point of use is an excellent alternative renewable energy, has drawn so much attention as a result of problems generated by CO2 emissions and global warming (Rahimpour et al 2017). The use of inorganic membranes and in particular palladium coated membranes has shown great application in hydrogenation and dehydrogenation reactions (Kiliçarslan, Afyon and Doğan 2008) (Alique, Martinez-Diaz, Sanz and Colins 2018) (Li 2007) and this is so because these palladium membranes are seen to be highly stable and possess high selectivity towards hydrogen (Chen and Gobina 2013) (Collins and Way 1993) (Hamilton 2012). There are various methods that can be used to prepare palladium alloyed membrane.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…Some examples are: electrolytic plating, electroless plating, chemical vapour deposition, magnetron sputtering, spray pyrolysis, anodic oxidation and sol gel techniques respectively (Kiliçarslan, Afyon and Doğan 2008) (Jiang, Goldbach, Bao, Yu and Xu 2008) (Li, Liang and Hughes 2000) (Checchetto, Bazzanella, Patton and Miotello, 2004). Lately the need for thin palladium-alloy films in preference to the thick free-standing dense metal membranes has been on the increase (Chen and Gobina 2013) (Exter 2014).…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

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Preparation and characterization of palladium ceramic alumina membrane for hydrogen permeation

Orakwe

Shehu

Gobina

2019

International Journal of Hydrogen Energy

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In this study, a tubular palladium membrane has been prepared by an electroless plating method using palladium II chloride as a precursor with the intent of not having a completely dense film since its application does not require high hydrogen selectivity. The support used was a 15 nm pore sized tubular ceramic alumina material that comprise of 77% alumina and 33% titania. It has dimensions of 7 mm inner and 10mm outer diameters respectively. The catalyst was deposited on the outside tube surface using the electroless deposition process. The membrane was morphologically characterized using scanning electron microscopy/energy dispersive x-ray analysis (SEM/EDXA) and liquid nitrogen adsorption/desorption analysis (BET) to study the shape and nature of the palladium plating on the membrane. The catalytic membrane was then inserted into a tubular stainless-steel holder which was wrapped in heating tapes so as to enable the heating of the membrane in the reactor. The gases used for permeation tests comprised H2, N2, O2 and He. Permeation tests were out at 573 K and at pressure range between 0.05-1 barg. The results showed that hydrogen displayed a higher permeation when compared to other gases that permeated through the membrane and its diffusion is also thought to include solution diffusion through the dense portions of the palladium in addition to Knudsen, convective and molecular sieving mechanisms occurring through cracks and voids along the grain boundaries. While high hydrogen selectivity is critically important in connection with hydrogen purification for fuel cells and in catalytic membrane reactors used to increase the yield of thermodynamically limited reactions such as methane steam reforming and water-gas shift reactions whereby the effective and selective removal of the H2 produced from the reaction zone shifts the equilibrium, it is not so important in situations in which the membrane has catalytic activity such that it is possible to carryout the reaction in situations where the premixed reactants are forced-through the membrane on which the catalysts is attached. This type of catalytically active membranes is novel and has not been tested in gassolid-liquid reactions and liquid-solid reactions before. With such a reactor configuration, it is possible to achieve good feed stream distribution and an optimal usage of the catalytic material. The preparation and characterization of such membrane catalysts has gained increased interests in the process industries because it can be adapted to carryout the chemical reactions if one of the reactants is present in low concentration and an optimal reactant distribution results in a better utilization of the active catalytic material. However, there are concerns in terms of the high cost of palladium membranes and research on how to fabricate membranes with a very low content of the palladium catalyst is still ongoing. Work is currently underway to deploy the Pd/Al2O3 membrane catalysts for the deoxygenating of water for downhole injection for pressure maintenance...

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