Study of the methane combustion and TPR/TPO properties of Pd/Ce–Zr–M/Al2O3 catalysts with M = Mg, Ca, Sr, Ba
Study of the methane combustion and TPR/TPO properties of Pd/Ce–Zr–M/Al2O3 catalysts with M = Mg, Ca, Sr, Ba
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DOI：
10.1016/j.molcata.2005.05.027
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发表时间：
2005-09
影响因子：
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通讯作者：
B. Yue;R. Zhou;Yue-juan Wang;Xiao-ming Zheng
中科院分区：
文献类型：
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作者：
B. Yue;R. Zhou;Yue-juan Wang;Xiao-ming Zheng
研究了Ce-Zr/Al_2 O_3和Ce-Zr-M/Al_2 O_3（M=Mg，Ca，Sr，Ba）负载Pd催化剂的甲烷燃烧性能。采用BET、XRD、TEM、H2-TPR、O2-TPO和CH 4/O2-TPSR等技术对催化剂进行了表征。甲烷燃烧活性测试结果表明，在Pd/Ce-Zr/Al 2 O3催化剂中添加微量碱土金属元素，在较低反应温度条件下明显提高了催化剂的催化活性，其中Pd/Ce-Zr-Ca/Al 2 O3催化剂的催化活性和热稳定性最高。Ca的加入抑制了Pd/Ce-Zr/Al 2 O3催化剂中PdO粒子的生长和分解，改善了活性PdO物种的还原-再氧化性能，从而提高了Pd/Ce-Zr/Al 2 O3催化剂的活性和热稳定性。
The methane combustion behavior is investigated over Pd catalysts supported on Ce–Zr/Al2O3and Ce–Zr–M/Al2O3(M=Mg, Ca, Sr, Ba). Characterization of the catalysts is performed by BET, XRD, TEM, H2-TPR, O2-TPO and CH4/O2-TPSR techniques. Activity tests in methane combustion show that the addition of trace alkaline earths to Pd/Ce–Zr/Al2O3catalyst obviously increases the catalytic activity of the catalysts under lower reaction temperature conditions, and Pd/Ce–Zr–Ca/Al2O3exhibits the highest catalytic activity and thermal stability among all catalysts. The addition of Ca to Pd/Ce–Zr/Al2O3inhibits the site growth and decomposition of PdO particles and improves the reduction–reoxidation properties of the active PdO species, which increases the catalytic activity and thermal stability of the Pd/Ce–Zr/Al2O3catalyst.