【摘要】 采用浸渍法,以脱脂棉和经硝酸预处理后的脱脂棉为生物模板,成功制备了具有纤维条状结构的Ba-MgO载体,并等体积浸渍了活性组分Ru,制得了负载型Ru/Ba-MgO氨合成催化剂。运用XRD,FE-SEM,FTIR等方法对所制备纳米Ba-MgO载体的表面性能进行表征,对所负载的Ru基催化剂进行氨合成催化活性评价,并探讨了纤维条状结构Ba-MgO载体的形成机理。实验结果表明,所制备的Ba-Mg O载体表面存在卷曲、褶皱等变化,在电子显微镜下可见纳米级颗粒;比表面积和孔体积增大;助催化剂Ba的吸附量增多;Ru/Ba-Mg O催化剂应用于氨合成反应的催化活性显著提高,在425℃,10MPa,GHSV=10 000 h^-1反应条件下,氨合成反应速率达68.53 mmol/（g·h）。更多还原

【Abstract】 Using degreasing cotton and pre-acid-treated degreasing cotton as biological templates,the ammonia synthesis catalyst with nano-Ba-MgO support and Ru-based active centres were prepared by incipient wetness impregnation method.XRD,FE-SEM,FTIR methods were used to study the properties of the prepared nano-Ba-MgO support.The ammonia synthesis catalysts were evalued and the formation mechanism of Ba-MgO support with fibrous strip structure was also discussed.The results showed that the surface morphology,such as curls and wrinkles,of the support prepared by using acid-treated degreasing cotton as a template had changed,and nano-scale particles can be seen under the electron microscope;the specific surface area and pore volume were increased;the actual adsorption amount of the co-catalyst Ba was increased;the catalytic activity of Ru/Ba-MgO catalyst for ammonia synthesis reaction is significantly improved.Under the reaction conditions of 425℃，10 MPa,and GHSV 10 000 h^-1,the ammonia synthesis reaction rate of Ru/Ba-MgO catalyst reached 68.53 mmol/（g·h）.更多还原