کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62332 47634 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Combined removal of diesel soot particulates and NOx over CeO2–ZrO2 mixed oxides
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Combined removal of diesel soot particulates and NOx over CeO2–ZrO2 mixed oxides
چکیده انگلیسی

CeO2 and Ce–Zr mixed oxides with different Ce:Zr ratios were prepared; characterised by Raman spectroscopy, XRD, TEM, N2 adsorption at −196 °C, and H2-TPR; and tested for soot oxidation under NOx/O2. Among the different mixed oxides, Ce0.76Zr0.24O2 provided the best results. Ce0.76Zr0.24O2 presented greater activity than pure CeO2 for soot oxidation by NOx/O2 when both catalysts were calcined at 500 °C (soot oxidation rates at 500 °C are 14.9 and 11.4 μgsoot/s, respectively), and the catalytic activity of CeO2 decayed significantly with calcination temperature (from 500 to 1000 °C), whereas Ce0.76Zr0.24O2 presented enhanced thermal stability at temperatures as high as 1000 °C. In addition, Ce0.76Zr0.24O2 catalysed the reduction of NOx by soot at around 500 °C more efficiently than CeO2, thereby contributing to the decreased NOx emission level. The catalytic activity of CeO2 and Ce0.76Zr0.24O2 for soot oxidation by NOx/O2 depended on the textural properties (BET area; crystallite size), but other properties of the oxides, such as redox behaviour and/or enhanced lattice oxygen mobility, also played a significant role.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 259, Issue 1, 1 October 2008, Pages 123–132
نویسندگان
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