| 钾对镁铝水滑石复合氧化物的表面改性 |
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| 引用本文： | 张业新,苏庆运,王仲鹏,高希彦,张昭良.钾对镁铝水滑石复合氧化物的表面改性[J].物理化学学报,2010,26(4):921-926. |
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| 作者姓名： | 张业新 苏庆运 王仲鹏 高希彦 张昭良 |
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| 作者单位： | Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China; College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China |
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| 基金项目： | 国家高技术研究发展计划(863)项目，国家自然科学基金，山东省自然科学基金，山东省博士基金 |
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| 摘 要： | 利用X射线衍射(XRD), X射线光电子能谱(XPS), 原位红外(in situ IR)光谱和CO2程序升温脱附(CO2-TPD)等技术研究了K对Mg-Al水滑石复合氧化物(MgAlO)的表面改性. 结果表明, 当K负载量臆8%(w)时, K高度分散在MgAlO表面, 并与载体作用形成了新的Lewis碱位. 其中, K取代MgAlO弱碱位OH上的质子形成弱碱性的Mg(Al)-O-K; 与强碱位表面O2-结合形成强碱性的Mg-O-K. 当K负载量为5%-8%(w)时, 还存在与载体作用较弱并具有更强碱性的准自由KOx. K增强MgAlO碱性的本质是K的电荷转移到了表面氧负离子上.
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| 关 键 词： | 原位红外光谱 水滑石 钾 表面改性 碱性位 |
| 收稿时间： | 2009-11-19 |
| 修稿时间： | 2010-02-26 |
Surface Modification of Mg-Al Hydrotalcite Mixed Oxides with Potassium |
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| ZHANG Ye-Xin, SU Qing-Yun WANG Zhong-Peng GAO Xi-Yan ZHANG Zhao-Liang.Surface Modification of Mg-Al Hydrotalcite Mixed Oxides with Potassium[J].Acta Physico-Chimica Sinica,2010,26(4):921-926. |
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| Authors: | ZHANG Ye-Xin SU Qing-Yun WANG Zhong-Peng GAO Xi-Yan ZHANG Zhao-Liang |
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| Institution: | Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China; College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China |
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| Abstract: | The surface modification of Mg-Al hydrotalcite mixed oxides (MgAlO) with K was investigated using X-ray powder diffraction (XRD),X-ray photoelectron spectroscopy (XPS),in situ infrared (in situ IR) spectroscopy,and temperature-programmed desorption of CO2 (CO2-TPD).We found that K was highly dispersed on the surface of MgAlO when the loading amount was less than 8% (w).New Lewis base sites were formed through the interaction between K and MgAlO.The weakly basic Mg(Al)-O-K resulted from the proton substituti... |
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| Keywords: | In situ IR Hydrotalcite Potassium Surface modification Basic site |
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