کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
60826 47548 2015 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Covalently and non-covalently immobilized clusters onto nanocarbons as catalysts precursors for cinnamaldehyde selective hydrogenation
ترجمه فارسی عنوان
خوشه های کوانتومی و غیرقابل انطباق مونتاژ شده بر روی نانو کربن ها به عنوان پیش سازهای کاتالیزور برای هیدروژناسیون انتخابی سینامالدئید
کلمات کلیدی
خوشه ها، سینامالدئید، نانوذرات، کاتالیزورهای دو فلزی، هیدروژن، گرافن، نانولوله های کربنی، بی تحرک غیرقابل انعطاف پذیر، پیوند زدن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• Ru mixed nanoparticles were prepared on carbon nanotubes and graphene from clusters.
• The cluster ligands allow covalent or non-covalent π–π interactions with carbon.
• Activity/selectivity in cinnamaldehyde hydrogenation is influenced by particle size.
• Selectivity is shifted from cinnamyl alcohol to hydrocinnamaldehyde by changing solvent.
• The best catalysts gave high selectivity in cinnamyl alcohol and could be reused.

Ru-based nanoparticles were deposited on carbon nanotubes and graphene via an organometallic approach involving mixed-metal clusters modified with appropriate ligands. These ligands allowed either covalent or non-covalent π–π interactions with the carbonaceous surfaces. The immobilized clusters were then coalesced at different temperatures to give carbon-supported nanoparticles of different sizes. The obtained catalysts were tested in the selective hydrogenation of cinnamaldehyde. It was found that the nature of the metal(s), support nature, incorporation method and activation temperature all had a profound influence on activity and selectivity. Interestingly, the selectivity could be shifted from cinnamyl alcohol (COL) to hydrocinnamaldehyde (HCAL) by changing the reaction solvent. The best catalysts gave a very high selectivity in cinnamyl alcohol, which is not the more thermodynamically favored product, and could be reused several times without loss of activity or selectivity.

Figure optionsDownload high-quality image (95 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 329, September 2015, Pages 389–400
نویسندگان
, , , , , ,