CAJ | 학술논문

在γ-Al2O3载体上用等体积浸渍法浸渍Pd、MnOx活性组分,然后涂覆于堇青石基体上制备Pd-MnOx/γ-Al2O3整体式催化剂.分别用 X 射线衍射(XRD)、H2-程序升温还原(H2-TPR)、低温 N2吸附-脱附及 X 射线光电子能谱(XPS)对制备的催化剂进行表征.研究了Pd、MnOx浸渍顺序对催化剂活性、氧化还原性能及织构性质的影响.实验结果表明, Pd、MnOx共浸渍较分别浸渍制备的催化剂活性好, Pd 和 MnOx之间存在一定的协同作用.考察了不同载体如La-Al2O3、SiO2、γ-Al2O3和Zr-Al2O3对催化剂活性、氧化还原性能、织构性质及表面电子性能的影响.研究表明,以La-Al2O3或SiO2为载体的催化剂活性最好,即,14°C时O3转化率为82%,完全转化温度为36°C.γ-Al2O3载体次之, Zr-Al2O3载体较差.不同载体制备的催化剂中 MnOx的氧化还原性能顺序为： Pd-MnOx/SiO2>Pd-MnOx/La-Al2O3>Pd-MnOx/γ-Al2O3>Pd-MnOx/Zr-Al2O3.
재γ-Al2O3재체상용등체적침지법침지Pd、MnOx활성조분,연후도복우근청석기체상제비Pd-MnOx/γ-Al2O3정체식최화제.분별용 X 사선연사(XRD)、H2-정서승온환원(H2-TPR)、저온 N2흡부-탈부급 X 사선광전자능보(XPS)대제비적최화제진행표정.연구료Pd、MnOx침지순서대최화제활성、양화환원성능급직구성질적영향.실험결과표명, Pd、MnOx공침지교분별침지제비적최화제활성호, Pd 화 MnOx지간존재일정적협동작용.고찰료불동재체여La-Al2O3、SiO2、γ-Al2O3화Zr-Al2O3대최화제활성、양화환원성능、직구성질급표면전자성능적영향.연구표명,이La-Al2O3혹SiO2위재체적최화제활성최호,즉,14°C시O3전화솔위82%,완전전화온도위36°C.γ-Al2O3재체차지, Zr-Al2O3재체교차.불동재체제비적최화제중 MnOx적양화환원성능순서위： Pd-MnOx/SiO2>Pd-MnOx/La-Al2O3>Pd-MnOx/γ-Al2O3>Pd-MnOx/Zr-Al2O3.
Pd-MnOx/γ-Al2O3 catalysts were prepared by impregnating Pd and MnOx on γ-Al2O3 supports, using an incipient wetness impregnation method, and then coating on a cordierite substrate to obtain monolithic catalysts. The catalysts were characterized using X-ray diffraction (XRD), temperature-programmed reduction of H2 (H2-TPR), low-temperature N2 adsorption-desorption measurements, and X-ray photoelectron spectroscopy (XPS). The effects of the Pd and MnOx impregnation order on the catalytic activity, redox performance, textural properties, and surface electronic characteristics of the catalysts were studied. The experimental results showed that the activity of the catalyst co-impregnated with Pd and MnOx on γ-Al2O3 was better than that of the catalyst impregnated sequentially with Pd and MnOx. A synergetic effect was observed between Pd and MnOx on the Pd-MnOx/γ-Al2O3 catalysts for ozone decomposition. The effects of various supports on catalytic activity, redox performance, textural properties, and surface electron characteristics of the catalysts were also investigated. The results indicated that the catalytic activities of Pd-MnOx/La-Al2O3 and Pd-MnOx/SiO2 catalysts were the best; ozone conversion reached 82% at 14 °C and ozone was completely decomposed at 36 ° C. The activity of the Pd- MnOx/γ- Al2O3 catalyst was second better, but the activity of the Pd-MnOx/Zr-Al2O3 catalyst was poor. The support clearly affects the reducibility of PdO and MnOx. The redox performances of MnOx impregnated on different supports fol owed the order:Pd-MnOx/SiO2>Pd-MnOx/La-Al2O3>Pd-MnOx/γ-Al2O3>Pd-MnOx/Zr-Al2O3.