| 脱硫类水滑石衍生复合氧化物不同方法的制备与表征 |
| 摘要点击 3938 全文点击 1554 投稿时间：2013-09-23 修订日期：2013-11-08 |
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| 中文关键词 尿素水解法 水滑石 复合氧化物 二氧化硫 吸附 |
| 英文关键词 urea hydrolysis hydrotalcite mixed oxides sulfur dioxide adsorption |
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| 中文摘要 |
| 采用尿素水解法和共沉淀法制备了MgAl类水滑石，高温焙烧获得衍生复合氧化物. 采用X射线衍射（XRD）、热重分析（TG-DTG）、扫描电镜（SEM）、N2-吸附/脱附和CO2程序升温脱附（CO2-TPD）等手段对所制备的复合氧化物结构特征进行表征，并研究其对SO2脱除性能的差异. 结果表明，共沉淀法制备的MgAlO复合氧化物比尿素法具有更大的比表面积（148.1 m2·g-1）和更多碱性位，这些特点可能促使该方法制备的复合氧化物具有更高的SO2储存容量和反应速率. 采用尿素法和共沉淀法制备的MgAl水滑石复合氧化物在700℃温度下SO2吸附容量分别可达0.55g·g-1和0.79 g·g-1. |
| 英文摘要 |
| Hydrotalcite-based MgAl mixed oxides were synthesized by urea hydrolysis and constant-pH coprecipitation methods,and characterized by means of X-ray diffraction (XRD), thermal gravity analysis-differential thermal gravity (TG-DTG), scanning electron microscope (SEM), N2-adsorption/desorption and CO2 temperature programmed desorption (CO2-TPD), and their adsorption performances for SO2 were also tested. It was found that MgAl mixed oxides prepared by coprecipitation method would facilitate the catalyst to maintain a high specific area (148.1 m2·g-1) and more basic sites, which resulted in higher SO2 adsorption capacity and velocity. The SO2 adsorption capacity of the mixed oxides prepared by urea hydrolysis and constant-pH coprecipitation methods were 0.55 g·g-1and 0.79 g·g-1 respectively at 700℃. |
