کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1525584 | 995357 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Decomposition kinetics study of AlOOH coated calcium carbonate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
AlOOH coated calcium carbonate was synthesized by a two-step chemical solution reaction. The phase and microstructure analysis were carried out by X-ray diffraction and scanning electron microscopy. Non-isothermal decomposition kinetics of the AlOOH coated calcium carbonate has been investigated on the basis of the TG-DTA analysis. The model-free and model fitting approaches were applied to the data for non-isothermal decomposition kinetics of AlOOH surface-coated calcium carbonate as well as the reference. Master-plot method was used to determine the decomposition mechanisms based on the kinetic parameter Ea achieved by model-free Kissinger equation. The reference sample decomposed according to the contracting area mechanism R2 and the AlOOH surface-coated calcium carbonate decomposed according to one-dimensional mechanism D1. The kinetic parameters Ea verified by both integral method and differential method showed about 90Â kJÂ molâ1 increase in the decomposition process after being coated. This is possibly due to the as-shell structure of surface AlOOH, which hinders the diffusion of the dissociated CO2 into the outer atmosphere.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 115, Issue 1, 15 May 2009, Pages 418-422
Journal: Materials Chemistry and Physics - Volume 115, Issue 1, 15 May 2009, Pages 418-422
نویسندگان
Dalai Jin, Xiaojing Yu, Linhai Yue, Lina Wang,