کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
44231 | 46010 | 2007 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Preparation of nanostructured Pd particles using a seeding synthesis approach—Application to the selective hydrogenation of buta-1,3-diene Preparation of nanostructured Pd particles using a seeding synthesis approach—Application to the selective hydrogenation of buta-1,3-diene](/preview/png/44231.png)
Well-defined nanostructured Pd particles were successfully synthesized in aqueous solution using a seeding-mediated approach with cetyltrimethylammonium bromide (CTAB) acting as both capping and structure-directing agent. Four well-defined nanoobjects were obtained: nanocubes, nanotetrahedra, nanopolyhedra, and nanorods. The anisotropic Pd nanorods exposed preferentially {1 0 0} facets due to the stabilization effect of CTAB.After deposition onto α-Al2O3, these nanostructured Pd particles were tested in the selective hydrogenation of buta-1,3-diene at 298 K under 20 bars of H2. Compared to an isotropic Pd catalyst, anisotropic Pd catalysts were found highly selective for the hydrogenation of buta-1,3-diene into butenes without further hydrogenation into butane. Moreover, on the nanostructured catalysts, further hydrogenation of but-1-ene into butane is reduced while but-2-enes were hardly converted. Finally, an unusual high level of cis but-2-ene isomer was observed. These results suggest a modification of the mechanism usually admitted for Pd catalysts when a well-defined nanomorphology is achieved.
Well-defined nanostructured Pd particles were successfully synthesized in aqueous solution using a seeding-mediated approach. Four well-defined nanoobjects were obtained: nanocubes, nanoprisms (or nanotetrahedra), nanopolyhedra, and nanorods. After deposition onto α-Al2O3, nanostructured Pd particles were found highly selective for the hydrogenation of buta-1,3-diene into butenes without further hydrogenation into butane.Figure optionsDownload as PowerPoint slide
Journal: Applied Catalysis A: General - Volume 327, Issue 1, 31 July 2007, Pages 32–43