Preparation and properties of Pd/Ag composite membrane for direct synthesis of hydrogen peroxide from hydrogen and oxygen

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

“…Later, various authors have also investigated similar catalytic membranes for removing nitrates from groundwater [34,35]. We also used these membranes for the direct synthesis of H 2 O 2 from H 2 and O 2 [36,37], and recently other research groups have investigated them in the same reaction [38,39]. Very interesting results have been also obtained using similar membranes for the catalytic direct oxidation of benzene to phenol [40][41][42][43].…”

Experimental study of porous tubular catalytic membranes for direct synthesis of hydrogen peroxide

“…Surface morphology (determined from membrane preparation method and conditions) influences also the membrane performance -smooth metal surface with large crystallites [6] and with high uniformity of grains [12] are found to improve catalytic activity. Although expected that the H 2 permeation through the dense Pd layer is the limiting step in the process, some authors claim, that the reaction is kinetically rather than diffusion controlled [12][13][14] with H 2 permeation rates up to three times higher than the H 2 consumption rates at their experimental conditions [14].…”

“…Therefore, a further modification with Ag [6,[10][11][12] and the addition of a consecutive Pd layer [6,12] as well as a hydrophobic polymer layer [6] have been performed in order to achieve higher productivity (ca. 28 mmol H 2 O 2 m −2 h −1 [12], ca. 50 mmol H 2 O 2 m −2 h −1 [6]) and selectivity (ca.…”

“…(i) distributor [6][7][8][9][10][11][12][13][14] -the active component (Pd or PdX, X = Ag, Au, Pt etc.) is in the form of a dense metallic layer coated on the outside surface of the tubular inorganic support.…”

Recent trends in metal alloy electrolytic and electroless plating research: a review

“…They feature not only improved corrosion resistance, including replacement technologies for established processes under legislative threat, such as cadmium plating, and enhanced wear resistance and hardness for tribological applications, [27][28][29][30][31][32][33][34][35][36][37][38] but also significant effort for other applications such as magnetic properties [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] and catalysis, membrane technology, hydrogen permeability and separation. [57][58][59][60][61][62][63][64][65][66][67][68] Further applications as diverse as batteries, conducting fabrics, whisker formation and prevention, electroforming, electrical and electronic devices, metallisation of nonand semiconductors, electromagnetic wave shielding, alloy foam production, fuel cells, hard gold and high speed Pd-Ni plating, and solderable alloys are also reported. In fact, application studies in this review are a significant majority of .70% over process and mechanistic studies, and this is believed to reflect the alloy plating ...…”