کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
45583 46416 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure sensitivity of selective catalytic reduction of NO with propylene over Cu-doped Ti0.5Zr0.5O2−δ catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Structure sensitivity of selective catalytic reduction of NO with propylene over Cu-doped Ti0.5Zr0.5O2−δ catalysts
چکیده انگلیسی


• Hierarchical structure Cu-doped Ti0.5Zr0.5O2-δ was fabricated by hydrothermal method.
• Well-organized morphology promoted the generation of active sites.
• N-containing organic intermediates only formed on the Hy-Sample.

The structure sensitivity of selective catalytic reduction (SCR) of NO with propylene over Cu-doped Ti0.5Zr0.5O2−δ catalysts was investigated systematically in a series of characterizations and in situ DRIFT spectroscopy. A Cu-doped Ti0.5Zr0.5O2−δ catalyst with a hierarchical structure was fabricated successfully using a hydrothermal method (Hy-Sample), and shown to exhibit excellent SCR performance with high reaction rate and turnover frequency (TOF). The physico-chemical properties, mass transfer, and SCR activity of the catalyst depended on the preparation method. Another sample of Cu-doped Ti0.5Zr0.5O2−δ catalyst prepared using a co-precipitation method (Co-Sample) exhibited a disordered, irregular morphology, whose SCR activity, as determined in a fixed bed reactor, was significantly lower than that of Hy-Sample. In comparison, Hy-Sample possessed an enhanced redox property, and its highly ordered morphology greatly promoted the generation of active sites, including the fine-dispersed CuO species and surface adsorbed oxygen. Consequently, NO and C3H6 were readily adsorbed and activated over Hy-Sample and induced the formation of important intermediates with high reactivity, such as isocyanate (−NCO) and cyanide (−CN) species. However, the activation capacity of Co-Sample toward reactants was very weak, and the sequential deficiency of N-containing organics could be the primary reason for the poor SCR activity of Co-Sample.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis B: Environmental - Volume 165, April 2015, Pages 519–528
نویسندگان
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