Effect of nickel content on sulfur tolerance of nickel-based catalysts for aromatic hydrogenation
Effect of nickel content on sulfur tolerance of nickel-based catalysts for aromatic hydrogenation
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发表时间：
2005
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通讯作者：
Huang Hua
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作者：
Huang Hua
采用浸渍法制备了不同镍含量的Ni/Al_2O_3催化剂。在1.0 Mpa、2 0 0℃和空速(2.0 h-1)条件下，考察了镍基催化剂在固定床连续流动微反中加氢反应的抗硫中毒性能。用X射线衍射仪、热重分析法、差示扫描量热法和比表面积法对催化剂的物化性能和结构进行了表征。结果表明，镍含量较高的催化剂具有很高的芳烃加氢活性和抗硫能力，而镍含量较低(<6.0%)的催化剂很可能生成不具有芳香族加氢活性的NiAl2O4。
Ni/Al_2O_3 catalysts with different nickel content were prepared by impregnation method. Tolerance of the nickel-based catalysts to sulfur poisoning was investigated via hydrogenation of toluene containing thiophene in a fixed-bed continuous-flow microreactor at 1.0 MPa, 200 ℃ and LHSV (2.0 h~(-1)). Physicochemical properties and structure of the catalysts were examined by XRD, TPR,DSC and BET. The results showed that the catalysts with high nickel content exhibited very high aromatic hydrogenation activity and tolerance to sulfur, while catalysts with low nickel content (less than 6.0%) was likely to form NiAl_2O_4 of no aromatic hydrogenation activity.