کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62424 47639 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Inorganic materials as supports for palladium nanoparticles: Application in the semi-hydrogenation of phenylacetylene
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Inorganic materials as supports for palladium nanoparticles: Application in the semi-hydrogenation of phenylacetylene
چکیده انگلیسی

A series of palladium heterogeneous catalysts supported on different inorganic materials were prepared using a palladium colloid and four different supports: γ-alumina (Pd/Al2O3), zeolite Beta (Pd/Beta), MCM-41, and Al-MCM-41. The two last catalysts were synthesized by two different methods of deposition of the metallic nanoparticles: impregnation or in situ synthesis of MCM in the presence of the Pd colloid. These catalysts were evaluated in the partial hydrogenation of phenylacetylene, performed in liquid phase, under very mild conditions (323 K, H2 flow of 30 mL/min, 1 bar pressure). All of the catalysts had very high selectivity toward styrene (around 96%) after total conversion. The activity values were very close to those of the homogeneous catalysts, being much greater for the catalysts obtained by synthesis of the MCM materials in presence of the Pd colloid, for which, the TOF values were fourfold to sixfold greater. The catalysts proved to be reusable; neither the catalytic activity nor the selectivity decreased appreciably after five consecutive cycles of reaction. Moreover, inductively coupled plasma (ICP) analysis confirmed that no Pd leaching from the samples occurred during the catalytic reaction.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 257, Issue 1, 1 July 2008, Pages 87–95
نویسندگان
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