Identification of Active Sites in Oxidation Reaction from Real-Time Probing of Adsorbate Motion over Pd Nanoparticles

Ahmed Ghalgaoui*, Ridha Horchani, Jijin Wang, Aimeric Ouvrard, Serge Carrez, Bernard Bourguignon

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةمراجعة النظراء

3 اقتباسات (Scopus)

ملخص

Obtaining insight into the type of surface sites involved in a reaction is essential to understand catalytic mechanisms at the atomic level and a key for understanding selectivity in surface-catalyzed reactions. Here we use ultrafast broad-band vibrational spectroscopy to follow in real-time diffusion of CO molecules over a palladium nanoparticle surface toward an active site. Site-to-site hopping is triggered by laser excitation of electrons and followed in real-time from subpicosecond changes in the vibrational spectra. CO photoexcitation occurs in 400 fs and hopping from NP facets to edges follows within ∼1 ps. Kinetic modeling allows to quantify the contribution of different facet sites to the catalytic reaction. These results provide useful insights for understanding the mechanism of chemical reactions catalyzed by metal NPs.

اللغة الأصليةEnglish
الصفحات (من إلى)5202-5206
عدد الصفحات5
دوريةJournal of Physical Chemistry Letters
مستوى الصوت9
رقم الإصدار18
المعرِّفات الرقمية للأشياء
حالة النشرPublished - سبتمبر 20 2018
منشور خارجيًانعم

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