Catalytic combustion of propane over mixed oxides derived from CuxMg3鈭?/sub>xAl hydrotalcites
- 作者：Zheng Jianga ; b ; zhjiang76@hotmail.com ; Liang Konga ; Zengyong Chua ; Liam J. Francea ; Tiancun Xiaoa ; xiao.tiancun@chem.ox.ac.uk ; Peter P. Edwardsa
- 关键词：CuxMg3&minus ; xAlO mixed oxides ; Hydrotalcite ; Propane ; Catalytic combustion
- 刊名：Fuel
- 出版年：2012
- 期刊代码：33_00162361
- 类别：ce
- 出版时间：June, 2012
- 卷：96
- 期：Complete
- 页码：257-263
- 文件大小：380 K
摘要
Cu-based mixed oxides (Cum>x m>Mg3鈭?/sub>m>x m>AlO-800s, m>x m> = 0, 0.5, 1.0, 1.5, 2.0 and 3.0) were prepared by calcinations of corresponding Cum>x m>Mg3鈭?/sub>m>x m>Al ternary hydrotalcites (Cum>x m>Mg3鈭?/sub>m>x m>Al-HTLCs) at 800 掳C and used for catalytic combustion of propane. The Cum>x m>Mg3鈭?/sub>m>x m>Al ternary hydrotalcites and derived combustion catalysts were well characterized to investigate the dependence of the performance of propane catalytic combustion with their structure and components. The results showed that Cu can replace Mg in a wide range of Cu/Mg ratios to form Cum>x m>Mg3鈭?/sub>m>x m>Al-HTLCs with the unique layered structure of hydrotalcite, though the Cu substitution significantly deteriorates the thermal stability of the Cum>x m>Mg3鈭?/sub>m>x m>Al-HTLCs. It was found that calcinations at 800 掳C completely transformed the Cum>x m>Mg3鈭?/sub>m>x m>Al-HTLCs to Cum>x m>Mg3鈭?/sub>m>x m>AlO-800 mixed oxides, containing spinel, periclase and tenorite oxide phases. The TPR results revealed those catalysts derived from hydrotalcites were easier to be reduced than the simply mixed oxides, this was due to the strong interactions among the components existing in the Cum>x m>Mg3鈭?/sub>m>x m>AlO-800 materials. The Cum>x m>Mg3鈭?/sub>m>x m>AlO-800 catalysts exhibit superior catalytic activity in propane combustion to Pd/Al2O3 and the mechanically mixed oxides. The excellent activities of the Cum>x m>Mg3鈭?/sub>m>x m>AlO-800 were attributed to the strong interaction among the component oxides as observed by the XRD, TG-DSC and TPR characterizations.