Characterization of carbon- and alumina-supported NiW and CoW sulfided catalysts

被引：13
|
作者：
Van der Meer, Y
Vissenberg, MJ
De Beer, VHJ
Van Veen, JAR
Van der Kraan, AM
机构：
[1] Delft Univ Technol, Interfac Reactor Inst, NL-2629 JB Delft, Netherlands
[2] Eindhoven Univ Technol, Schuit Inst Catalysis, NL-5600 MB Eindhoven, Netherlands
来源：
HYPERFINE INTERACTIONS | 2002年 / 139卷 / 1-4期
关键词：
hydrodesulfurization catalysts; NiW sulfide; CoW sulfide; EXAFS;
D O I：
10.1023/A:1021211103003
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
Sulfided NiW and CoW catalysts supported on activated carbon and alumina were characterized with Co-57 Mossbauer emission spectroscopy (MES) and EXAFS at the W-L-III edge. NiW catalysts were studied with MES by probing the Ni atoms with 57Co. MES results demonstrate that the 'Ni-W-S' phase is present in sulfided NiW catalysts. Formation of Co9S8-type phases could be related to the lower thiophene HDS activity of CoW catalysts. WEXAFS showed that addition of Co or Ni to a W/Al2O3 catalyst results in a higher W sulfidation degree. No structural differences were found for carbon- and alumina-supported catalysts, in spite of the two times larger thiophene HDS activity of carbon- supported NiW.
引用
收藏
页码：51 / 57
页数：7
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