【摘要】 大气压氢等离子体在负载型贵金属催化材料的制备中有重要的应用,本实验采用大气压氢等离子体技术制备了Ru/UiO-66催化材料,研究了大气压氢等离子体技术和传统的氢热还原技术所制备的Ru/UiO-66催化材料在结构和性能上的特点。X射线衍射、扫描电镜、N₂吸附脱附、X光电子能谱和透射电镜分析结果表明:大气压氢等离子体与传统的氢热还原法均能很好地保持多孔材料UiO-66的晶相结构、形貌、比表面积和孔结构,并将氧化态Ru还原成单质态Ru。与氢热还原法相比,大气压氢等离子体制备的Ru/UiO-66样品中Ru粒径更小。等离子体与Ru/UiO-66共同作用CO₂甲烷化反应结果表明:两种方法制备的Ru/UiO-66具有相似的催化活性,CO₂转化率可达70%以上,CH₄选择性高于90%。这说明大气压氢等离子体还原技术可以代替传统的氢热还原制备负载型Ru/UiO-66催化材料,省去后者长时间的程序升温和降温过程,有效缩短催化材料的制备周期。更多还原

【Abstract】 Atmospheric hydrogen plasma（AHP） has been generally used in the preparation of supported noble metal catalytic materials. In this paper, Ru/UiO-66 catalyst was prepared by atmospheric pressure hydrogen plasma, and compared the structural and performance characteristics with the sample prepared by the traditional hydrogen thermal reduction method. The results of X-ray diffraction（XRD）, scanning electron microscopy（SEM）, N₂ adsorption-desorption isotherm, X-ray photoelectron spectroscopy（XPS） and transmission electron microscope（TEM） showed that both atmospheric pressure hydrogen plasma method and traditional hydrogen thermal reduction method can maintain the crystal structure, morphology, specific surface area and pore structure of porous material UiO-66. The particle size of Ru in the sample prepared by the hydrogen plasma system is smaller than that of thermal reduction method. It is noteworthy that the Ru/UiO-66 prepared by the two methods has similar catalytic activity, and the CO₂ conversion can reach more than 70% under the plasma assisted in the CO₂ methanation reaction, and the CH₄ selectivity is more than 90%. It indicates that atmospheric pressure hydrogen plasma reduction technology can replace traditional thermal reduction to prepare the supported Ru/UiO-66 catalytic material with ultrafine metal particles. It can also save the long and tedious time of heating and cooling, and short the period of material treatment effectively.更多还原