Palladium-silver membranes

Guryanova, S. G., V. M. Gryaznov and S. Kanizius. 1973. Selective hydrogenation of acetylene on a palladium-silver membrane catalyst. Analiz Soverm. Zadach u Tech. Naukakh 172. 

McCool B, Xomeritakis G, Lin YS. Composition control and hydrogen permeation chara-teristics of sputter deposited palladium-silver membranes. J Memb Sci. 1999 161 67-76. Moss TS, Peachey NM, Snow RC, Dye RC. Multilayer metal membranes for hydrogen separation. Int J Hydrogen Energy. 1998 23(2) 99. 

C. Lanzerstorfer, H. Puxbaum, The palladium/silver membrane focusing injector-a new inlet system for thermal desorption capillary gas chromatography, Fresenius J. Anal. Chem. 1991, 339(4). 223-225. 

B. A. McCool, Y.S. Lin, Nanostructured thin palladium-silver membranes Effects of grain size on gas permeation properties,/. Mater. Sci. 2001, 36, 3221-3227. 

B. McCool, G. Xomeritakis and Y. S. Lin, Composition control and hydrogen permeation characteristics of sputter deposited palladium-silver membranes, /. Membr. Sci., 1999, 161, 67-76. 

Deshpande, K., Meldon, J.H., Schmidt, M.A. and Jensen, K.F. (2010) SOI-Supported microdevice for hydrogen purification using palladium-silver membranes. Journal of Microelectromechanical Systems, 19,402 09. 

Deshpande K, Meldon J H, Schmidt M A and Jensen K F (2010), SOI-supported microdevice for hydrogen purification using palladium-silver membranes , J... 

Marigliano et al. compared the performance of two different types of tubular methane steam reforming membrane reactors by numerical simulations [413]. In the first, the catalyst was packed into the palladium/silver membrane tube, and in the second it was positioned in the annular region surrounding the membrane tube. Both configurations were heated from the outside. Owing to the indirect heat transfer to the catalyst bed inside the membrane tube, methane conversion was lower in this instance, and under certain conditions it was even inferior to a conventional fixed bed... 

Basile et al. performed steam reforming and autothermal reforming of methanol in a fixed-bed of copper/zinc oxide catalyst, which was positioned below a palladium/ silver membrane containing 20 wt.% silver which had athickness of 60 pm [525]. The pressure on the reaction side was 1.2 bar, while the permeate side was under... 

A membrane separation device was prepared by Wilhite et al. by micro-electromechanical techniques [526]. The palladium/silver membrane deposited onto a silicon oxide support was only 20-nm thick, which was possibly the lowest membrane thickness ever reported for hydrogen separative purposes. A lanfhanum/nickel/cobalt oxide catalyst (LaNi0.95Co0.05O3) catalyst for partial oxidation of methanol was deposited onto the membrane. At a O/C ratio of 0.86 and 475 °C reaction temperature, up to 64% methanol conversion and more than 90% hydrogen selectivity could be achieved. These workers claimed a deviation from Sievert s law (see Section 5.2.4) for their membrane. N amely, the hydrogen flux did not depend by a power of 0.5 of the retenate and permeate pressure but rather by a power of 0.97, which they attributed to the absence of internal solid-state diffusion limitations in their ultra-thin membrane. 

Thin metallic membranes can be produced by techniques such as rolling. Tosti et al. described the fabrication of palladium/silver membranes by cold rolling [643]. Several steps of rolling and annealing were required and eventually resulted in membranes of 50-pm thickness. The Vickers hardness of the membranes was increased by the rolling procedure. Cylindrical membrane separators were fabricated from the membranes by welding. 

Gielens et al. described the fabrication of a palladium/silver membrane which contained 77 wt.% palladium and was 750-nm thick. The membrane was sputtered onto a silicon chip [645], At 450 °C a hydrogen flux of 22.4 L (m was determined... 

J. Chabot, J. Lecomte, C. Ciumet, J. Sannier, Euel clean-up system poisoning of palladium-silver membranes by gaseous impurities. Fusion Science and Technology, 14 (1988)614-618. 

Pizzi D, Worth R, Giacinti Baschetti M, Sarti G C and Noda K, Hydrogen permeability of 2.5 im palladium-silver membranes deposited on ceramic supports ,... 

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