کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62025 47617 2010 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation, characterization, and kinetic evaluation of dendrimer-derived bimetallic Pt–Ru/SiO2 catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Preparation, characterization, and kinetic evaluation of dendrimer-derived bimetallic Pt–Ru/SiO2 catalysts
چکیده انگلیسی

A series of silica-supported Pt, Ru, and Pt–Ru catalysts has been synthesized using dendrimer–metal nanocomposite (DMN) precursors prepared by both co- and sequential complexation with metal salts. The catalysts have been characterized by several techniques, including electron microscopy, temperature-programmed titration of adsorbed oxygen, and X-ray diffraction. Liquid-phase selective hydrogenation of 3,4-epoxy-1-butene (EpB) was used as a probe reaction to evaluate their catalytic performance. The bimetallic catalyst prepared by the co-complexation method exhibits a superior catalytic activity compared to the sequential one, and is much more active than a conventional catalyst prepared by incipient wetness. The activity enhancement is attributed to a bifunctional performance of the PtRu alloy sites created, based on a strong correlation between turnover frequencies, and both the alloy compositions and metal surface site distributions. In addition, the co-complexation catalyst is selective toward crotonaldehyde, suggesting that this reaction pathway is favored on the PtRu sites.

Pt–Ru dendrimer-metal nanocomposites were synthesized using co-complexation and sequential complexation methods as shown. The Pt–Ru bimetallic catalysts synthesized via dendrimer route were found to exhibit different structural properties and catalytic performance (i.e., activities, selectivities) for selective hydrogenation when compared to conventionally prepared Pt–Ru samples.Figure optionsDownload high-quality image (166 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 269, Issue 2, 5 February 2010, Pages 376–387
نویسندگان
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