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采用等体积浸渍法制备了Pd/Al2O3和Rh-Pd/Al2O3密偶催化剂,运用H2程序升温还原、CO化学吸附和X射线光电子能谱等手段对催化剂进行了表征,并考察了催化剂对丙烷总包反应和单反应的转化活性.总包反应结果表明,Rh的添加使起燃温度和完全转化温度分别降低了23和18 oC.单反应结果证明,添加Rh能提高各单反应丙烷的转化活性,尤其是有NO参与的反应.表征结果证明,掺杂Rh不仅可以抑制活性组分PdOx的烧结,提高PdOx的分散度,而且可以改变其电子状态
The Pd / Al 2 O 3 and Rh-Pd / Al 2 O 3 catalysts were prepared by the same volume impregnation method. The catalysts were characterized by temperature programmed reduction with H2, CO chemisorption and X-ray photoelectron spectroscopy. The effects of catalyst on the total propane Package reaction and single reaction conversion activity.The results of the total package reaction showed that addition of Rh decreased the light-off temperature and the complete conversion temperature by 23 and 18 ° C. The results of the single reaction showed that addition of Rh increased the conversion activity of propane , Especially with NO involved in the reaction.The characterization results show that Rh can not only inhibit the sintering of the active ingredient PdOx, improve the dispersion of PdOx, and can change its electronic state