کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62275 47631 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Catalytic oxidation of methacrolein to methacrylic acid over silica-supported 11-molybdo-1-vanadophosphoric acid with different heteropolyacid loadings
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Catalytic oxidation of methacrolein to methacrylic acid over silica-supported 11-molybdo-1-vanadophosphoric acid with different heteropolyacid loadings
چکیده انگلیسی

Catalytic oxidation of methacrolein (MAL) to methacrylic acid (MAA) over SiO2-supported H4PMo11VO40 with different H4PMo11VO40 loadings was investigated. H4PMo11VO40/SiO2 showed high activity in comparison with unsupported H4PMo11VO40, and 3.3 mol% H4PMo11VO40/SiO2 (50 wt.% H4PMo11VO40) had the highest activity, which was five-times larger than that of unsupported H4PMo11VO40 due to high dispersion of H4PMo11VO40 on SiO2, as determined by temperature-programmed desorption of benzonitrile. On the other hand, the supported catalysts were less selective toward the formation of MAA. From X-ray diffraction and Raman spectroscopy, it was determined that H4PMo11VO40 decomposed to form MoO3 on SiO2 during the catalytic reaction. Since SiO2-supported MoO3 and unsupported MoO3 had only very low selectivity toward the formation of MAA in the oxidation of MAL, it was concluded that the formation of MoO3 caused the decrease in the catalytic performance of the supported catalysts.

Graphcial abstractH4PMo11VO40/SiO2 showed high activity for oxidation of methacrolein to methacrylic acid comparing with unsupported H4PMo11VO40 due to high dispersion of H4PMo11VO40 on SiO2, as determined by temperature-programmed desorption of benzonitrile.Figure optionsDownload high-quality image (109 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 273, Issue 1, 7 July 2010, Pages 1–8
نویسندگان
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