کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
675160 | 1459593 | 2009 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Comparative evolved gas analyses of crystalline and amorphous titanium(IV)oxo-hydroxo-acetylacetonates by TG-FTIR and TG/DTA-MS
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Crystalline samples (characterized by XRD, PDF 00-35-1778 reference pattern) are releasing acetylacetone (acacH) vapors already from 140 °C onwards. At 245 °C, after an acceleration of this release process, a huge and sharp exothermic heat effect also occurs and results in additional evolution of acetic acid, CO2, H2O, and CO. Minute amount of unidentified volatile species with ion fragments not higher than m/z = 152 are also detected up to 285 °C. The remaining organic residues are burning out from the solid phase in two further exothermic stages until 500 °C. While an amorphous hydrated sample (with low acetylacetonate content) releases first 6.6% of water vapor until 140 °C, then acetone and acetylacetone up to 300 °C. Between 215 and 385 °C, some acetic acid, CO2, and CO is also evolved. Formation of CO2 is detected till 650 °C. At 800 °C, the anatase: rutile TiO2-ratio were 11:89 and 84:16 for the well-crystallized and the amorphous sample, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 489, Issues 1â2, 20 May 2009, Pages 37-44
Journal: Thermochimica Acta - Volume 489, Issues 1â2, 20 May 2009, Pages 37-44
نویسندگان
János Madarász, Shoji Kaneko, Masayuki Okuya, György Pokol,