کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
65106 48383 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shape-dependent catalytic activity of palladium nanoparticles for the direct synthesis of hydrogen peroxide from hydrogen and oxygen
ترجمه فارسی عنوان
فعالیت کاتالیزوری وابسته به شکل نانوذرات پالادیوم برای سنتز مستقیم پراکسید هیدروژن از هیدروژن و اکسیژن
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• {1 0 0} facet enclosed nanocubes (9 nm) were used as seeds for octahedron synthesis.
• Pd octahedrons were enclosed by {1 1 1} facet and had 23 nm in edge length.
• Pd {1 1 1} facet showed better activity than Pd {1 0 0} facet for the H2O2 synthesis.

In this study, single-crystal Pd nanocubes and nanooctahedrons were prepared by the colloidal method and their catalytic activities were compared in direct hydrogen peroxide synthesis. Using sodium tetrachloropalladate (II) as the Pd precursor, l-ascorbic acid (or formaldehyde) as the reducing agent, potassium bromide as the capping agent, and polyvinylpyrrolidone as the stabilizer, Pd nanocubes were obtained in a uniform size (9 nm). Pd octahedrons (23 nm in edge length) were synthesized via seed-mediated growth of the Pd nanocube, where the morphology of the cube was altered to that of a cuboctahedron, truncated octahedron, and octahedron, in series. The cubes and octahedrons were enclosed by {1 0 0} and {1 1 1} facets, respectively. In activity tests, the Pd octahedron presented higher hydrogen peroxide selectivity and productivity than the Pd cube. It is therefore suggested that the Pd {1 1 1} facet is more active than the Pd {1 0 0} facet in direct hydrogen peroxide synthesis.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 391, September 2014, Pages 48–54
نویسندگان
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