کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1262204 971852 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of preparation method on MnOx-CeO2 catalysts for NO oxidation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Effect of preparation method on MnOx-CeO2 catalysts for NO oxidation
چکیده انگلیسی

The NO oxidation reaction was studied over MnOx-CeO2 catalysts prepared by co-precipitation, impregnation and mechanical mixing method, respectively. It was found that the co-precipitation was the most active and a 60% NO conversion was achieved at 250 °C. X-ray diffraction (XRD), Brumauer-Emmett (BET), H2-temperature programmed reduction (H2-TPR) and oxygen storage capacity (OSC) techniques were employed to characterize the physical and chemical properties of the catalysts. XRD results showed that amorphous MnOx or Mn-O-Ce solid solution existed in co-precipitation and impregnation prepared sample, while crystalline MnOx was found in mechanical mixing catalyst. A larger surface area was observed on co-precipitation prepared catalyst compared to those prepared by impregnation and mechanical mixing. The strong interaction between MnOx and CeO2 enhanced the reducibility of the oxides and increased the amount of Mn4+ and activated oxygen, which are favorable for NO oxidation to NO2.

Graphical AbstractNO conversion curves of MnOx (0.4)-CeO2 prepared by different methods (gas composition: 100 ppm NO, 10% O2, 5% CO2, 5% H2O and balanced N2; GHSV=30000 h−1)Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Rare Earths - Volume 31, Issue 6, June 2013, Pages 572–576
نویسندگان
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