The reactions of 2,2′-dinaphthyl ether and diphenyl ether were studied at 375–425°C using 6.9 MPa (cold) hydrogen or nitrogen, 9,10-dihydrophenanthrene (DHP) and decalin as solvents, and a molybdenum sulfide catalyst. We chose to examine these compounds as models for the cleavage of diaryl ether bridges during coal liquefaction. The molybdenum sulfide was added to the reaction as MoS3, which should transform to the active MoS2 catalyst. Cleavage of the CarO in 2,2′-dinaphthyl ether, at reaction temperatures of 375 and 400°C, proceeded in the sequence H2 < DHPN2 < DHPH2 < DHPMoS3N2 < DHPMoS3H2 < MoS3H2 < Dec.MoS3H2. At 425°C, the MoS3H2 and Dec.MoS3H2 systems exchange places in this order. Diphenyl ether is less reactive than dinaphthyl ether toward hydrogenolysis reactions under these conditions. The conversion rate of diphenyl ether increases in the order H2 < DHPH2 < DHPMoS3N2 < DHPMoS3H2 < Dec.MoS3H2 < MoS3H2. Although the rates of conversion of the two ethers are different, the relative effects of using a reactive gaseous atmosphere, donor solvent, catalyst - or some combination of these factors - are the same for both compounds. In liquefaction experiments, hydrogen donor solvent or hydrogen shuttling solvent seems necessary to reduce retrogressive reactions. However, a solvent interacting strongly with catalyst and scavenging hydrogen atoms can reduce the activity of catalysts in hydrocracking reactions.

中文翻译：

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二萘基和二苯醚在液化条件下的反应

使用 6.9 MPa（冷）氢气或氮气、9,10-二氢菲 (DHP) 和十氢化萘作为溶剂，以及硫化钼催化剂，在 375–425°C 下研究了 2,2'-二萘基醚和二苯醚的反应。我们选择检查这些化合物作为煤液化过程中二芳基醚桥断裂的模型。硫化钼作为 MoS3 添加到反应中，它应该转化为活性 MoS2 催化剂。CarO 在 2,2'-二萘基醚中的裂解，在 375 和 400°C 的反应温度下，按顺序 H2 < DHPN2 < DHPH2 < DHPMoS3N2 < DHPMoS3H2 < MoS3H2 < 十二月MoS3H2。在425℃时，MoS3H2和Dec.MoS3H2系统依次交换位置。在这些条件下，二苯醚对氢解反应的反应性低于二萘基醚。二苯醚的转化率按H2 < DHPH2 < DHPMoS3N2 < DHPMoS3H2 < Dec.MoS3H2 < MoS3H2的顺序增加。尽管两种醚的转化率不同，但使用反应性气体气氛、供体溶剂、催化剂——或这些因素的某些组合——对两种化合物的相对影响是相同的。在液化实验中，氢供体溶剂或氢穿梭溶剂似乎是减少逆向反应所必需的。然而，与催化剂强烈相互作用并清除氢原子的溶剂会降低催化剂在加氢裂化反应中的活性。使用反应性气体气氛、供体溶剂、催化剂——或这些因素的某种组合——的相对影响对于这两种化合物是相同的。在液化实验中，氢供体溶剂或氢穿梭溶剂似乎是减少逆向反应所必需的。然而，与催化剂强烈相互作用并清除氢原子的溶剂会降低催化剂在加氢裂化反应中的活性。使用反应性气体气氛、供体溶剂、催化剂——或这些因素的某种组合——的相对影响对于这两种化合物是相同的。在液化实验中，氢供体溶剂或氢穿梭溶剂似乎是减少逆向反应所必需的。然而，与催化剂强烈相互作用并清除氢原子的溶剂会降低催化剂在加氢裂化反应中的活性。