石油炼制与化工 ›› 2020, Vol. 51 ›› Issue (10): 60-64.

• 基础研究 • 上一篇    下一篇

原位红外光谱分析噻吩在硫化后Ni-Mo-W/γ-Al2O3 催化剂上的吸附-脱附行为

陈俊霖1,赵基钢1,陈文斌2,沈本贤1,秦康2,江洪波1   

  1. 1. 华东理工大学化工学院绿色能源化工国际联合研究中心
    2. 中国石化石油化工科学研究院
  • 收稿日期:2020-04-07 修回日期:2020-05-14 出版日期:2020-10-12 发布日期:2020-10-27
  • 通讯作者: 赵基钢 E-mail:zjg@ecust.edu.cn
  • 基金资助:
    国家重点研发计划项目

STUDY ON ADSORPTION AND DESORPTION BEHAVIOR OF THIOPHENE ON Ni-Mo-W/γ-Al2O3 CATALYST BY IN-SITU INFRARED SPECTROSCOPY

  • Received:2020-04-07 Revised:2020-05-14 Online:2020-10-12 Published:2020-10-27
  • Contact: Jigang Zhao E-mail:zjg@ecust.edu.cn

摘要: 为改进加氢脱硫催化剂及清洁油品生产工艺,以噻吩作为模型化合物,采用原位漫反射红外光谱技术考察Ni-Mo-W/γ-Al2O3催化剂的硫化行为和对噻吩的吸附-脱附行为。结果表明:Ni-Mo-W/γ-Al2O3催化剂在320 ℃时表面已硫化。在400 ℃下硫化1 h后进行噻吩吸附-脱附试验,发现噻吩在硫化Ni-Mo-W/γ-Al2O3催化剂上的原位程序升温脱附过程中,波数1558 cm-1处的C=C伸缩振动峰在150 ℃时消失,波数1575 cm-1处的C=C伸缩振动峰、波数1413 cm-1和1396 cm-1处的C—H面内弯曲振动峰在250 ℃时消失,波数1700 cm-1和1679 cm-1处的C=C伸缩振动峰在350 ℃时消失,而波数1537 cm-1和1513 cm-1处的C=C伸缩振动峰、波数1340 cm-1处的C—H面内弯曲振动峰增强,对应了噻吩的不同吸附方式,这为不同脱硫路径的加氢脱硫催化剂的设计开发提供了数据支持。

关键词: 噻吩, Ni-Mo-W/γ-Al2O3, 原位红外光谱, 硫化, 吸附

Abstract: In order to improve hydrodesulfurization catalysts and production processes, the in-situ diffuse reflectance infrared spectroscopy was used to study the sulfidation performance of Ni-Mo-W/γ-Al2O3 catalyst and adsorption behavior of thiophene. The results showed that Ni-Mo-W/γ-Al2O3 catalyst surface was sulfided at 320 ℃, and the thiophene adsorption test at 400 ℃ sulfidation for 1 h found that during in-situ temperature programmed desorption process of sulfided catalyst, the characteristic peak at 1 558 cm-1 (C=C stretching vibration) disappeared at 150 ℃; characteristic peak at 1 575 cm-1 (C=C stretching vibration), and 1 413 cm-1, 1 396 cm-1 (C-H bending vibration) disappeared at 250 ℃; the thiophene adsorption characteristic peaks at 1 537 cm-1, 1 513 cm-1 (C=C stretching vibration) and 1 340 cm-1 (C-H bending vibration) strengthen; characteristic peaks at 1 700, 1 679 cm-1 (C=C stretching vibration) disappeared at 350 ℃, indicating different adsorption way of thiophene. The experimental data provides basis for design and development of higher active HDS catalysts with different sulfur removal pathway.

Key words: thiophene, In-Situ infrared spectroscopy, sulfidation, adsorption