کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4763373 | 1422962 | 2017 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ostwald-ripening sintering kinetics of Pd-based three-way catalyst: Importance of initial particle size of Pd
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Ostwald-ripening sintering kinetics of Pd-based three-way catalyst: Importance of initial particle size of Pd Ostwald-ripening sintering kinetics of Pd-based three-way catalyst: Importance of initial particle size of Pd](/preview/png/4763373.png)
چکیده انگلیسی
The sintering rates of commercial and lab-prepared Pd three-way catalysts (TWCs) as a function of the catalyst mileage were examined by CO chemisorption, XRD and TEM. Interestingly, the sintering rates of the Pd catalysts with a larger initial particle size were slower than those with a smaller initial particle size. This moderation of the growth rate of Pd with increasing initial particle sizes was consistent with the Ostwald-ripening mechanism, attributable mainly to the combination of the decrease of the surface tension of the Pd crystallite and the increase of the evaporating activation energy of Pd. Moreover, the variation of the Pd particle size distribution (PSD) observed in the TEM analysis was well predicted by the Ostwald-ripening sintering model in which the sintering kinetic parameter was a unique function of the initial particle size of Pd.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 316, 15 May 2017, Pages 631-644
Journal: Chemical Engineering Journal - Volume 316, 15 May 2017, Pages 631-644
نویسندگان
Sung Bong Kang, Jong Bin Lim, Donghui Jo, In-Sik Nam, Byong K. Cho, Suk Bong Hong, Chang Hwan Kim, Se H. Oh,