泡沫铝负载钌基催化剂应用于N2O的低温催化分解研究

将导热性能良好的泡沫铝作为载体,羰基钌为前驱体制备了一系列不同形态的钌基催化剂应用于N2O的低温催化分解研究.采用XRD、XPS、SEM、TEM、BET、H2-TPR等方法对催化剂进行了表征,于石英管固定床反应器上对催化剂性能进行了评价.重点考察了泡沫铝作为催化剂载体的可行性、载体的处理方法对催化剂活性的影响以及RuO2、Ru、Ru3(CO)12所表现出的活性差异.结果表明:泡沫铝作为催化剂载体,能够促进N2O的催化分解;泡沫铝经H2O2处理有利于提高其对活性中心的附着力,提高催化活性;N2O浓度为1%,Ru负载量为0.3%,活性中心分别为Ru3(CO)12、Ru、RuO2时,N2O完全转化温度依次为285、380和415℃;活性较高的Ru3(CO)12/泡沫铝催化剂在长时间作用后活性组分转变为RuO2.

Ru Supported on Foamed Aluminum Applied in the Low-temperature Catalytic Decomposition of N2O

Three different types of Ru catalysts (RuO2/FAl, Ru/FAl, Ru3(CO)12/FAl) with foamed aluminum (FAl) as support, Ru3(CO)12 as precursor were prepared and their low-temperature catalytic performance for decomposition of N2O were investigated. The catalysts were characterized by XRD, XPS, SEM, TEM, H2-TPR and BET methods. The feasibility of using FAl as a support was verified, the impact by the treatment methods on the carrier was tested, and the different activities showed by RuO2/FAl, Ru/FAl, Ru3(CO)12/FAl catalysts were observed. Catalytic activity of the catalysts were evaluated with a quartz tube reactor and the results showed that FAl as support improved the catalytic activity for decomposition of N2O partly. In addition, pretreatment of FAl surface with H2O2 reinforced the adhesion of catalyst active center, hence enhancing the catalytic activity. When the loading value of Ru on FAl is 0.3wt.%, 1% N2O can be decomposed completely by Ru3(CO)12, Ru and RuO2 under 285 °C, 380 °C and 405 °C, respectively. Meanwhile, the highest activity of Ru3(CO)12/FAl catalyst was converted to RuO2/FAl after keeping work for a long time.