کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
63049 47669 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Relation between nanoscale Au particle structure and activity for CO oxidation on supported gold catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Relation between nanoscale Au particle structure and activity for CO oxidation on supported gold catalysts
چکیده انگلیسی

The CO oxidation activity of Au/TiO2, Au/MgAl2O4, and Au/Al2O3 catalysts, all containing approximately 4 wt% Au, was compared with the detailed size and shape of the gold particles in these supported catalysts. Based on the indications that CO oxidation on Au catalysts requires low-coordinated Au atoms, the turnover frequency per Au atom located at the corners of the Au particles was calculated. A value of approximately 0.8 s−1 for both the Au/TiO2 and the Au/MgAl2O4 catalyst was found. This represents an example in which the difference in catalytic activity of a Au catalyst with a reducible and irreducible support can be explained by a difference in Au particle geometry only, without the need to invoke other support-induced effects. The turnover frequency per corner Au atom in the Au/Al2O3 catalyst is approximately 4 times lower, indicating that other support-induced effects not related to the reducibility may play a role in this case.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 240, Issue 2, 10 June 2006, Pages 108–113
نویسندگان
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