【摘要】 以小麦粉为碳源,纳米氧化硅球为模板,通过固相研磨法混合,直接炭化制备了镶嵌式钌炭催化剂(Ru-SC),通过氮气物理吸附、CO静态化学吸附、X射线粉末衍射(XRD)和透射电镜等表征。结果表明,Ru-SC具有介孔结构,钌纳米粒子均匀镶嵌于小麦粉炭中。同时研究了其催化苯甲酸水相加氢的反应性能,发现具有中孔和镶嵌式结构的Ru-SC在苯甲酸加氢反应中具有优异的催化活性,在120℃,氢气压力为4 MPa的条件下,转化频率达524 h-1;经过5次套用实验后转化率没有明显下降,表现出良好的稳定性。该方法利用原料丰富的小麦粉为碳源,制备工艺简单,成本低,在负载型金属催化剂的制备中具有广阔的应用前景。更多还原

【Abstract】 The Ru nanoparticles embedded in carbon catalyst(Ru-SC) was successfully prepared by using wheat flour as the carbon source, ruthenium trichloride as the metal precursor with in-situ carbon thermal reduction method. Through CO chemisorption and TEM characterization, it was proved that ruthenium nanoparticles were homogeneously dispersed, partly embedded on the pore wall of the carbon support. The Ru-SC catalyst showed excellent catalytic performance in the aqueous hydrogenation of benzoic acid. The conversion rate and selectivity of catalyst Ru-SC was significantly higher than that of Ru/AC catalyst, and the Turnover frequency(TOF) reached 524 h-1 at 120 ℃ and hydrogen pressure of 4 MPa. Moreover, it had good stability, and the conversion rate did not decrease obviously after applying the experiment for 5 times. This method used abundant biological wheat flour as carbon precursor, with simple preparation process and low cost. It was expected to be widely used in the preparation of supported metal catalysts.更多还原