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用CO和NO吸附的红外光谱表征了还原态的Ru-Co-Mo/Al_2O_3催化剂。结果表明,和Ru/Al_2O_3相比,CO吸附于Ru-Co-Mo/Al_2O_3的Ru中心上的红外谱带向高波数移动;和Co-Mo/Al_2O_3相比,CO和NO吸附在Ru-Co-Mo/Al_2O_3的Co、Mo中心上的特征谱带向低波数移动;通过TPD-IR还可看到,CO和NO在Ru-Co-Mo/Al_2O_3的吸附量及脱附温度大大地提高了。这些结果说明在Ru-Co-Mo/Al_2O_3的Ru中心上的部分电子转移到Co、Mo中心或其周围,或者Ru中心的存在促进了Co、Mo中心的还原。
The reduced Ru-Co-Mo / Al 2 O 3 catalyst was characterized by IR spectra of CO and NO adsorbed. The results show that compared with Ru / Al 2 O 3, the infrared bands of CO adsorbed on the Ru center of Ru-Co-Mo / Al 2 O 3 move to higher wavenumbers. Compared with Co-Mo / Al 2 O 3, CO and NO are adsorbed on Ru-Co The characteristic bands on the Co and Mo centers of -Mo / Al_2O_3 shifted to low wavenumbers. The TPD-IR also showed that the adsorption amount of CO and NO on Ru-Co-Mo / Al_2O_3 and the desorption temperature were greatly increased . These results indicate that the partial electron transfer on or around the Ru center of Ru-Co-Mo / Al 2 O 3 to the center of Co and Mo, or the Ru center promotes the reduction of Co and Mo centers.