前驱体对纳米棒二氧化铈载钯催化剂催化甲苯燃烧性能的影响*
首发时间:2015-04-09
摘要:采用水热法制备了纳米棒二氧化铈,并以其为载体,通过浸渍法制备了不同前驱体的Pd/CeO2催化剂。采用透射电镜、X射线衍射、X射线光电子能谱和氢气程序升温还原等手段对催化剂进行了表征,并在微型固定床反应器上评价了催化剂催化甲苯燃烧性能。结果表明,不同前驱体制备的Pd/CeO2催化剂中Pd均以Pd2+的形式存在于纳米棒状CeO2表面。以硝酸钯为前驱体的Pd/CeO2催化剂中Pd2+物种具有更低的氢气还原温度,同时在甲苯催化燃烧反应中显示出更低的T50和T90,其温度分别为219和236 ℃,表明以硝酸钯为前驱体纳米棒二氧化铈为载体制备的催化剂具有更高的催化活性。
关键词: 纳米棒二氧化铈 Pd/CeO2催化剂 前驱体 甲苯 催化燃烧?
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Effect of precursor of palladium on the performance of palladium supported on ceria nanorods in toluene catalytic combustion
Abstract:Palladium catalysts with various precursors supported on CeO2 nanorods were prepared by impregnation method. These catalysts were characterized using transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and H2 temperature programmed reduction. The catalytic performance of these catalysts for toluene combustion was evaluated in a fixed-bed microreactor. The results suggested that palladium highly dispersed on the CeO2 nanorods surface as Pd2+ states in all the Pd/CeO2 catalysts with various precursors. Pd-N/CeO2 (palladium nitrate as precursor) showed a lower reduction temperature than Pd-C/CeO2 (palladium chloride as precursor), and showed a lower T50 and T90 at 219 and 236 ℃, respectively, in toluene catalytic combustion, indicating that Pd-N/CeO2 possesses higher catalytic activity than that over Pd-C/CeO2.
Keywords: CeO2 nanorods, Pd/CeO2 catalysts, precursor, toluene, catalytic combustion
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前驱体对纳米棒二氧化铈载钯催化剂催化甲苯燃烧性能的影响*
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