کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
58575 47158 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The activity and stability of Pd/C catalysts in benzene hydrogenation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
The activity and stability of Pd/C catalysts in benzene hydrogenation
چکیده انگلیسی

Carbon black supported Pd catalysts were prepared by an incipient wetness impregnation method and tested for benzene hydrogenation. The catalytic activity is subjected to serious deactivation. However, the deactivation is found to depend on the test procedure. When the reaction is performed under constant flow of benzene and hydrogen during a stepwise temperature-ascending-descending test sequence, no deactivation is observed. Deactivation occurs when the reaction gas is replaced by a He purge during temperature changes in the test sequence. The Pd/C catalysts prepared from different precursors show similar activation energy and similar TOF as oxide-supported Pd catalysts when deactivation is confined by applying suitable experimental procedures. EXAFS, TEM, and TGA results suggest that both Pd sintering and carbonaceous residue are responsible for the deactivation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 123, Issues 1–4, 30 May 2007, Pages 133–141
نویسندگان
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