Mingxing Zhao,Jun Hu,Ping Lu,Shiliang Wu,Chao Liu,Yahui Sun
Efficient hydrodeoxygenation of lignin-derived bio-oils to cycloalkanes was achieved over bifunctional RuCoW x /NC catalyst prepared by in situ pyrolysis method. The performance of RuCoW x /NC was investigated in HDO of 4-propylguaiacol, considering the influences of catalysts, initial H 2 pressure, and reaction temperature. Catalyst screening reveals that RuCoW 0.03 /NC afforded the highest propylcyclohexane yield of 71.3% from 4-propylguaiacol at 220 ℃. At 240 ℃, the yield of propylcyclohexane increased to 95.2 %. The heavy fraction of rice husk bio-oil, primarily composed of lignin-derived phenolic compounds, could be upgraded to 98.3% hydrocarbons at 280 ℃ over RuCoW 0.03 /NC. The synergistic interaction between highly dispersed Co and Ru metal sites and WO x acidic sites is responsible for the excellent HDO activity of RuCoW 0.03 /NC. Besides, RuCoW 0.03 /NC exhibited high stability after four cycles.
Oxides have traditionally been considered inert in hydrogen evolution reaction due to their strong adsorption of hydrogen. Here, we successfully prepared a novel RuCoWOx-400 catalyst by strategically adjusting the calcination temperature to manipulate the growth of oxide heterointerfaces. The characterization techniques reveal that RuCoWOx-400 is a porous structure and contains multiple heterogeneous interfaces to enhance catalytic activity. Additionally, the as-synthesized RuCoWOx-400 exhibits low overpotential of 93 mV at 10 mA cm −2 coupled with small Tafel slope of 37.22 mV dec −1 in 1 M KOH. Remarkably, the electrochemical performance of RuCoWOx-400 remains stable for up to 50 h. Moreover, the adsorption and desorption of water at Co, W, and Ru sites coordinate the hydrogen evolution reaction, highlighting the unique role of these elements in enhancing catalytic activity. This study underscores the potential of oxide materials in hydrogen evolution reaction, paving the way for further exploration and optimization in this field.
危险品化学品经营许可证（带存储）