Petroleum Processing and Petrochemicals ›› 2020, Vol. 51 ›› Issue (10): 60-64.

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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

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