کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
46833 46450 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Carbon nanostrutured materials as direct catalysts for phenol oxidation in aqueous phase
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Carbon nanostrutured materials as direct catalysts for phenol oxidation in aqueous phase
چکیده انگلیسی

The catalytic oxidation of phenol in aqueous phase (CWAO) over different carbon nanostrutured materials, nanofibres (CNFs), carbon nanotubes (CNTs) and high surface area graphite (HSAG), and the derivative materials prepared by surface oxidation, has been comparatively studied. Furthermore, in order to determine the effect of the oxidation treatment the samples were characterized by thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and BET measurements. Important differences among these carbon materials were found in terms of catalytic activity. The oxidized CNFs (ox/CNFs), which probably exhibits the most homogeneous surface after introduction of carboxylic groups by oxidation were the most catalytically active. Particular emphasis has been paid to understand the role of different surface chemistry on the produced oxidation intermediates during the phenol CWAO reaction. Samples with higher concentration of carboxylic surface groups, ox/CNFs and ox/CNTs, show less accumulation of refractory short chain acids, like formic, malonic and oxalic acid during the reaction.

Figure optionsDownload as PowerPoint slideHighlights
► The oxidation treatment with HNO3 of the CNFs gives place to a homogeneous incorporation of oxygen groups.
► The oxidation treatment of HSAG material does not have any significant effect on its catalytic activity.
► The higher relative concentration of COOH functional groups originates an improved elimination of short chain carboxylic acids from the reaction mixture.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis B: Environmental - Volume 104, Issues 1–2, 27 April 2011, Pages 101–109
نویسندگان
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