石油炼制与化工 ›› 2014, Vol. 45 ›› Issue (9): 52-56.

• 催化剂 • 上一篇    下一篇

Cu(Ⅱ)-Ce(Ⅳ)/13X分子筛的制备及其脱硫性能研究

宋乐春,陈楠,项玉芝,夏道宏   

  1.  中国石油大学(华东) 化学工程学院重质油国家重点实验室
  • 收稿日期:2014-02-28 修回日期:2014-04-03 出版日期:2014-09-12 发布日期:2014-08-19
  • 通讯作者: 夏道宏 E-mail:xiadh@upc.edu.cn

PREPARATION OF Cu(Ⅱ)-Ce(Ⅳ) BIMETAL ION-EXCHANGED 13X ZEOLITES AND THEIR DESULFURIZATION PERFORMANCE

  • Received:2014-02-28 Revised:2014-04-03 Online:2014-09-12 Published:2014-08-19

摘要: 采用离子交换法制备Cu2+和Ce4+同时改性的Cu(Ⅱ)-Ce(Ⅳ)/13X分子筛吸附剂,同时制备单一金属离子Cu2+改性的Cu(Ⅱ)/13X和Ce4+改性的Ce(Ⅳ)/13X。采用X射线粉末衍射(XRD)、氮气吸附-脱附等手段对吸附剂进行表征。将碳四烃中的典型硫化物二甲基二硫化物、甲硫醚、叔丁硫醇溶于正庚烷中进行吸附脱硫研究。结果表明:与未改性的13X分子筛相比,Cu2+和Ce4+改性的Cu(Ⅱ)-Ce(Ⅳ)/13X分子筛的比表面积和孔体积有所降低,平均孔径和介孔数量增加,由于两种金属的协同作用,使得Cu(Ⅱ)-Ce(Ⅳ)/13X表现出更好的脱硫性能;Cu(Ⅱ)-Ce(Ⅳ)/13X吸附剂对二甲基二硫化物、甲硫醚、叔丁硫醇的脱除效率均高于单一金属改性后的Ce(Ⅳ)/13X和Cu(Ⅱ)/13X吸附剂;Cu(Ⅱ)-Ce(Ⅳ)/13X吸附剂具有良好的再生性能,第1次再生后脱硫率为新鲜吸附剂的98%。

Abstract: Desulfurization adsorbents of Cu(Ⅱ)-Ce(Ⅳ) bimetal ion-exchanged 13X zeolites,and Cu(Ⅱ)/13X ion-exchanged and Ce(Ⅳ)/13X ion-exchanged were prepared, respectively. The prepared adsorbents were characterized by XRD and N2 adsorption-desorption. Desulfurization performance of the desulfurization adsorbents for dimethyl disulfide, dimethyl sulfide, and tert-butyl mercaptan was investigated. The results indicate that compared with results of the adsorbents before modification the specific surface area and total pore volume of the prepared desulfurization adsorbents decrease, while the average pore diameter and the number of mesopore increase. The Cu(Ⅱ)-Ce(Ⅳ) bimetal ion-exchanged 13X zeolites exhibit good desulfurization performance, better than the results of single metal-exchanged adsorbents Cu(Ⅱ)/13X and Ce(Ⅳ)/13X, due to the synergistic effect between the two cations. Regeneration performance of spent desulfurization adsorbents was investigated and the results demonstrate that the regenerated adsorbents have a perfect desulfurization performance, and the desulfurization rate of the adsorbents after first regeneration is 98% of the fresh adsorbents.