کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62051 47619 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of active site densities and mechanisms for soot combustion with O2 on Fe-doped CeO2 mixed oxides
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Determination of active site densities and mechanisms for soot combustion with O2 on Fe-doped CeO2 mixed oxides
چکیده انگلیسی

Fe-doped CeO2 mixed oxides were studied for soot combustion with O2 under tight contact conditions. They show increased activity compared to that of pure CeO2 and Fe2O3. The optimum Fe content according to soot ignition temperatures is Fe/(Ce + Fe) = 10 at.%. However, on the basis of turnover frequencies, the samples with a Fe/(Ce + Fe) ratio between 5 and 20 at.% show similar activity. Characterization of the catalysts and a kinetic study show that the reaction proceeds via a redox mechanism. The active sites were determined to be composed of Fe–O–Ce species, and the active oxygen was quantified using isothermal anaerobic titrations with soot as a probe molecule. The redox property for the Fe–O–Ce species is much stronger than for the Ce–O–Ce species. The methodology for quantifying active redox sites can be extended to soot combustion on all similar oxide systems.

The densities of active oxygen sites and turnover frequencies for soot combustion on Fe-doped CeO2 mixed oxides are determined by isothermal anaerobic titrations with soot as the probe molecule.Figure optionsDownload high-quality image (32 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 276, Issue 1, 19 November 2010, Pages 16–23
نویسندگان
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