کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9607785 | 46028 | 2005 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spatially resolved in situ measurements of transient species breakthrough during cyclic, low-temperature regeneration of a monolithic Pt/K/Al2O3 NOx storage-reduction catalyst
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We employed a new experimental technique known as spatially resolved capillary-inlet mass spectrometry (SpaciMS) to observe the evolution of multiple species inside the channels of a monolithic NOx storage-reduction (NSR) catalyst. The NSR material consisted of a Pt/K/Al2O3 washcoat deposited inside cordierite monolith channels. Spatially and temporally resolved measurements were made over the monolith length in a bench flow reactor during fast cycling between synthetic lean and rich environments at 200 and 300 °C. Regeneration was found to be very efficient at 300 °C regardless of whether pure H2, pure CO, or mixtures of H2 and CO were employed. At 200 °C, CO was noticeably less effective than H2. We conjecture that at 200 °C CO may be inhibiting the regeneration process through its strong adsorption on Pt. Generation of H2 by water-gas shift was seen at 300 °C but not at 200 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 293, 28 September 2005, Pages 24-40
Journal: Applied Catalysis A: General - Volume 293, 28 September 2005, Pages 24-40
نویسندگان
Jae-Soon Choi, William P. Partridge, C. Stuart Daw,