کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5361832 1388277 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Novel PdAgCu ternary alloy: Hydrogen permeation and surface properties
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Novel PdAgCu ternary alloy: Hydrogen permeation and surface properties
چکیده انگلیسی

Dense PdAgCu ternary alloy composite membranes were synthesized by the sequential electroless plating of Pd, Ag and Cu on top of both disk and tubular porous stainless steel substrates. X-ray diffraction and scanning electron microscopy were employed to study the structure and morphology of the tested samples. The hydrogen permeation performance of these membranes was investigated over a 350-450 °C temperature range and a trans-membrane pressure up to 100 kPa. After annealing at 500 °C in hydrogen stream followed by permeation experiments, the alloy layer presented a FCC crystalline phase with a bulk concentration of 68% Pd, 7% Ag and 25% Cu as revealed by EDS. The PdAgCu tubular membrane was found to be stable during more than 300 h on hydrogen stream. The permeabilities of the PdAgCu ternary alloy samples were higher than the permeabilities of the PdCu alloy membranes with a FCC phase. The co-segregation of silver and copper to the membrane surface was observed after hydrogen permeation experiments at high temperature as determined by XPS.

► PdAgCu membranes were prepared by sequential electroless plating technique. ► Hydrogen permeabilities of PdAgCuFCC alloy were higher than permeabilities of PdCuFCC membranes. ► Both XRD and XPS provided evidence of the PdAgCuFCC ternary alloy formation. ► Ag and Cu co-segregation to the surface takes place under hydrogen permeation experiments.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 257, Issue 15, 15 May 2011, Pages 6626-6635
نویسندگان
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