کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4996055 | 1459439 | 2017 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal decomposition of a peroxopolytitanic acid cryogel: TA/MS study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Thermal decomposition of a peroxopolytitanic acid cryogel was followed by simultaneous thermal analysis (TG/DTA) coupled with mass spectrometer (MS) and infrared spectroscope (FTIR). During the decomposition, the evolution of H2O (either residual moisture or as product of dehydration reactions), NH3 (precipitating agent used in preparation), O2 (decomposition of peroxogroups), SO2 (decomposition of residual sulfates), N2 (freezing agent in preparation), N2O, NO, NO2 (products of NH3 oxidation) and CO2 (adsorbed from atmosphere) was sought for. It was determined, that the decomposition is a four step process. During the first step, water and carbon dioxide evolve. At around 300 °C both N2O and CO2 (m/z = 44) were detected, as confirmed by FTIR spectroscopy. At 430-450 °C (depending of heating rate) amorphous phase crystallizes into anatase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 647, 10 January 2017, Pages 1-7
Journal: Thermochimica Acta - Volume 647, 10 January 2017, Pages 1-7
نویسندگان
Monika Palkovská, Václav Slovák, Jan Å ubrt, Jaroslav BoháÄek, Jakub HavlÃn,