کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
42277 45918 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural effects of titanium(IV) oxide encapsulated in a hollow silica shell on photocatalytic activity for gas-phase decomposition of organics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Structural effects of titanium(IV) oxide encapsulated in a hollow silica shell on photocatalytic activity for gas-phase decomposition of organics
چکیده انگلیسی

TiO2 particles encapsulated in hollow silica shells with controlled shell thicknesses were fabricated. Compared to naked TiO2 without coverage by a hollow silica shell, all of these composites showed low levels of photocatalytic activity for gas-phase decomposition of acetone into CO2. The activities over these composites tended to decrease with increase in thickness of the lateral silica shell. These results can be explained by a decrease in the diffusion of acetone with increase in thickness of the silica shell, leading to hampering of supply of the substrate to the surfaces of core TiO2 particles. In contrast, for the overall photodecomposition of gaseous 2-propanol into CO2, the presence of the lateral silica shell was found to be beneficial, i.e., the composite induced a high level of activity compared to the activity of naked TiO2. The enhancement of activity for this reaction was likely to be due to condensation of the intermediate product of acetone in the void spaces, leading to an increase in the collision probability between acetone and the surface of the TiO2 core.

Photocatalytic activities of TiO2 particles encapsulated in hollow silica shells for gas-phase decomposition of acetone and 2-propanol were investigated. Compared to the naked TiO2 sample, acetone decomposition on these composites did not occur efficiently, but overall decomposition of 2-propanol into CO2 did occur efficiently. Suppression of the diffusion of reaction substrates/intermediates by the lateral silica shell induced these unique behaviors.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 369, Issues 1–2, 15 November 2009, Pages 113–118
نویسندگان
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