The Structure of Well Defined SiO2 Supported MoO3 Clusters during Sulfidation. An in situ EXAFS-study | Zendy

Mark de Boer | Zendy; A.J. van Dillen | Zendy; D.C. Koningsberger | Zendy; J.W. Geus | Zendy

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The Structure of Well Defined SiO₂ Supported MoO₃ Clusters during Sulfidation. An in situ EXAFS-study

Author(s) -

Mark de Boer,

A.J. van Dillen,

D.C. Koningsberger,

J.W. Geus

Publication year - 1993

Publication title -

japanese journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.487

H-Index - 129

eISSN - 1347-4065

pISSN - 0021-4922

DOI - 10.7567/jjaps.32s2.460

Subject(s) - sulfidation , extended x ray absorption fine structure , molybdenum , catalysis , transition metal , stacking , chemistry , crystallography , hydrodesulfurization , in situ , phase (matter) , materials science , inorganic chemistry , absorption spectroscopy , physics , organic chemistry , quantum mechanics , biochemistry

The sulfidation of a well defined MoC3/SiO2 catalyst has been examined by means of TPS, EXAFS, and TEM. The oxidic clusters in a 5.6 wt% MoO3/SiO2 catalyst are transformed into almost completely sulfided particles (MoOxSy) by O-S exchange at RT. A molybdenum-sulfido particle that resembles the MoS3 structure is formed during sulfidation at 423 K. The MoS2 phase is formed at temperatures between 523 and 573 K. The transition of MoS3 into MoS2 can be monitored by evolution of H2S from the catalyst, with simultaneous consumption of H2. The twodimensional size of the MoS2 slabs can be derived from the EXAFS Mo-Mo coordination number by means of a theoretical model. The stacking height of the slabs must be elucidated by TEM.

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