کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10244800 | 47704 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pd-PVP colloid as catalyst for Heck and carbonylation reactions: TEM and XPS studies
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Pd-PVP colloid as catalyst for Heck and carbonylation reactions: TEM and XPS studies Pd-PVP colloid as catalyst for Heck and carbonylation reactions: TEM and XPS studies](/preview/png/10244800.png)
چکیده انگلیسی
Pd-PVP colloid (stabilized with polyvinylpyrrolidone) with a diameter of 19.8 nm in [Bu4N]Br medium catalyzes Heck coupling of bromobenzene with butyl acrylate and methoxycarbonylation of iodobenzene reactions. Oxidative addition of PhI or PhBr to Pd-PVP as the first step of a catalytic reaction was confirmed by TEM and XPS measurements. TEM studies showed significant reduction of Pd nanoparticle size after their reaction with PhX (X = I, Br) and [Bu4N]X (X = Cl, Br, I). The biggest shift of the center of nanoparticle size distribution, from 19.8 nm to 7.6 nm, was found when Pd-PVP reacted with PhI and [Bu4N]Br. The formation of [Bu4N]2[Pd(Ph)Br3]- and [Bu4N]2[PdBr4]-type complexes in that system was evidenced by XPS and UV-vis spectra.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 229, Issue 2, 25 January 2005, Pages 332-343
Journal: Journal of Catalysis - Volume 229, Issue 2, 25 January 2005, Pages 332-343
نویسندگان
Andrzej Gniewek, Anna M. Trzeciak, Józef J. ZióÅkowski, Leszek KÄpiÅski, Józef Wrzyszcz, WÅodzimierz Tylus,