以单质硫为硫化介质的加氢催化剂间歇釜器外预硫化工艺

利用间歇釜研究了以单质硫为硫化介质, 对一种Co-Mo-Ni/Al₂O₃加氢催化剂进行器外预硫化时, 硫和氢气配比、硫用量、初始反应温度及时间、硫化终温和时间等工艺条件对硫化效果的影响, 并对不同状态催化剂进行了XRD、SEM及BET的分析表征。以硫化度作为硫化效果评价指标, 确定优化的硫化条件:硫为1.2倍理论消耗量, 硫和氢气摩尔配比1:3, 低温硫化和高温硫化温度分别为160℃和320℃, 两段恒温硫化时间分别为3h和2h。对硫化后的催化剂进行了真实原料的加氢活性评价, 实验结果表明, 以单质硫作为硫化介质, 利用歇釜可满足器外预硫化的需求, 与器内硫化相比, 硫化度和加氢活性等具有明显优势。

Presulfidation with sulphur for hydrogenation catalyst in a batch reactor

The ex-situ presulfidation for a Co-Mo-Ni/Al₂O₃ hydrogenation catalyst was investigated with sulphur in a batch reactor, the effects of different factors, such as the ratio of S and H₂, the dosage of S, initial and final presulfidation temperatures and their constant time, were studied, while sulfidity was used as evaluating index, and catalysts were characterized by XRD, SEM, and BET. Suitable reaction condition was obtained as:Sulphur was 1.2 times of theoretical value, the proportion of S and H₂ was 1:3, together with 3h of reaction at 160℃ and 2h of final reaction at 320℃. After presulfidation, the hydrogenation activity of presulfided catalyst was measured by industrial feed hydroreaction in microreactor. The results indicated that this technology is feasible and the activity of catalyst, which was presulfided with sulphur in a batch reactor, is better than that of in-situ process.