高等学校化学学报2012，Vol.33Issue(2)：353-360,8.DOI:10.3969/j.issn.0251-0790.2012.02.025
硅藻土负载AgO复合材料的制备及热分解非等温动力学
Preparation and Non-isothermal Kinetics of Thermal Decomposition of AgO-loaded Diatomite Composite
摘要
Abstract
AgO-loaded diatomite composite was prepared by chemical oxidation-deposit method using potassium persulfate as oxidant. The composite was characterized by X-ray diffraction, scanning electron microscope and the laser particle size analyzer. The process and kinetic behavior of thermal decomposition of the composite were studied by means of thermogravimetry. The results show that the AgO-loaded diatomite composite with a AgO content (mass fraction) of 12. 7% is made up of tetragonal christobalite and monoclinic silver peroxide. The size of the composite is in the range of 0. 614-116. 5 (xm and the median-particle-size and specific surface area of the composite are 18. 53 μm and 203. 32 mVkg, respectively. The composite decomposes at 171°C along with the formation of silver oxide followed by decomposing into silver at higher temperature. The mechanism of decomposition reaction is random nucleation and subsequent growth mechanism ( Al) , and the apparent activation energy and reaction frequency factor are 131. 37 kj/mol and 3. 19xl013 s-1, respectively. Compared with reference silver peroxide powders, the thermal decomposition temperature of the composite rises and a considerable increase of the activation energy up to 40 kj/mol was observed.关键词
过氧化银/硅藻土/热分解/动力学/反应机理Key words
AgO/ Diatomite/ Thermal decomposition/ Kinetics/ Reaction mechanism分类
化学化工引用本文复制引用
沈文宁,冯拉俊,冯慧..硅藻土负载AgO复合材料的制备及热分解非等温动力学[J].高等学校化学学报,2012,33(2):353-360,8.基金项目
陕西省教育厅专项科研计划(批准号:2010JK751)资助. （批准号:2010JK751）
