The efficient hydrogenolysis of dibenzofuran (DBF) was investigated at 360 °C and atmospheric hydrogen pressure with Co/MoO₃ catalysts. All catalysts selectively cleaved the C–O bond and thus effectively transformed DBF to biphenyl (BP) at relatively moderate conditions. A strong promotional effect in the catalytic activity was observed over the Co/MoO₃ catalyst with the optimal Co content of 3 wt %, as evidenced by the decreasing activation barrier which was resulted from Co-facilitated increase of active Mo species and acidic sites. The best catalytic activity was realized with almost 100% yield of BP over Co/MoO₃. During 300 h of catalyst life test, the MoO₃ and Co/MoO₃ catalysts underwent a gradual deactivation because of the over-reduction of Mo species and carbon deposition as evidenced by the characterization of X-ray diffraction, X-ray photoelectron spectroscopy, Raman, thermogravimetric analysis–mass spectrum, and transmission electron microscopy. However, the deactivated catalyst can be regenerated with simple calcination using O₂, without losing its initial activity. Characterization studies demonstrated that the formation of MoO_xC_yH_z played an important role in stabilizing Mo species by preventing over-reduction to inactive Mo⁴⁺ species.

中文翻译：

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共促进的MoO ₃催化剂在二苯并呋喃加氢水解中的失活和再生研究

使用Co / MoO ₃催化剂在360°C和大气压氢气下研究了二苯并呋喃（DBF）的有效氢解作用。所有催化剂在相对适中的条件下选择性裂解C-O键，从而有效地将DBF转化为联苯（BP）。与具有3wt％的最佳Co含量的Co / MoO ₃催化剂相比，在催化活性中观察到了强烈的促进作用，这由共同促进活性Mo种类和酸性位点的增加而导致的活化势垒降低所证明。与Co / MoO _3相比，BP具有近100％的收率，实现了最佳的催化活性。在300小时的催化剂寿命测试中，MoO ₃和Co / MoO ₃X射线衍射，X射线光电子能谱，拉曼，热重分析-质谱和透射电子显微镜的表征证明，由于Mo物种的过度还原和碳沉积，催化剂逐渐失活。但是，可以使用O ₂通过简单的煅烧来再生失活的催化剂，而不会失去其初始活性。表征研究表明，MoO _x C _y H _z的形成通过防止过度还原成非活性Mo ⁴⁺物种而在稳定Mo物种中起着重要作用。