کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
56051 47070 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation and characterization of catalysts based on oniumsilica-immobilized Keggin acids
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Preparation and characterization of catalysts based on oniumsilica-immobilized Keggin acids
چکیده انگلیسی

A new method has been developed for preparing acid onium salts of Keggin heteropolyacids via ion exchange on amorphous silica functionalized with pyridinium and alkylimidazolium cations (SiO2–Q). The interaction between HPA and the surface-grafted cations affords acid salts of HPA with intact Keggin structure. This method offers excellent dispersion of HPA on the surface and higher resistance to HPA leaching in polar media, compared to the silica-based materials. The solids are thermally stable up to 250–300 °C, depending on the onium cation and anion, the most stable being the samples with immobilized H4SiW12O4 and H3PW12O40.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 169, Issue 1, 1 July 2011, Pages 138–149
نویسندگان
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