In Situ EXAFS of CoMo/γ -Al2O3 Catalysts During Hydrodesulfurization of Benzothiophene

Boudart, M.; Betta, Ralph Dalla; Föger, K.; Löffler, Daniel

doi:10.1007/978-3-642-46522-2_46

Cited by 4 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sample is treated at reaction conditions in the upper compartment and is lowered into the adjoining compartment with X-ray transparent thin windows maintained at ambient pressure by opening a valve attached to the bottom of the sample holder and between two compartments. Boudart et al 3 constructed one of the first in situ XAFS cells capable of achieving 250 °C at 1050 psi by using 0.5 mm thick water-cooled Be windows to study the Mo K-edge. Because of the relatively long penetration distance of high energy (20 keV) Mo radiation, they were able to get good results.…”

Section: In Situ Xafs Cellmentioning

confidence: 99%

In Situ XAFS Spectroscopic Studies of Direct Coal Liquefaction Catalysts

et al. 1996

View full text Add to dashboard Cite

An in situ cell capable of withstanding typical coal liquefaction reaction conditions was designed and built for XAFS investigations. Three different Fe-based catalysts for direct coal liquefaction were studied at the reaction conditions of 1000 psig (cold) hydrogen pressure and up to 500 °C temperature. Both near-edge (XANES) and radial structure function (EXAFS) data showed gradual conversion from iron oxyhydroxide to pyrrhotite. The starting temperature and the temperature range over which such transformations occur vary significantly with the catalyst system being investigated.

show abstract

Section: In Situ Xafs Cellmentioning

confidence: 99%

In Situ XAFS Spectroscopic Studies of Direct Coal Liquefaction Catalysts

et al. 1996

View full text Add to dashboard Cite

show abstract

In-situ studies of catalysts by XAFS and Mössbauer spectroscopy

Clausen

Topsøe

1989

Hyperfine Interact

View full text Add to dashboard Cite

Study by Synchrotron Radiation of the Structure of a Working Catalyst at High Temperatures and Pressures

Boudart

Betta

Föger

et al. 1985

Science

View full text Add to dashboard Cite

A relation among activity, composition, and structure was determined for a working catalyst by means of a stainless-steel reactor cell of novel design that permitted operation at temperatures and pressures similar to those in industrial reactors. Molybdenum K-edge x-ray absorption spectra were used to probe the structural environment of molybdenum in CoMoS/[unknown]-alumina catalysts while hydro-desulfurization of benzothiophene was proceeding at high temperature and pressure. For catalyst samples with different contents of cobalt, radial structure functions obtained from extended x-ray absorption fine structure data presented the same features as those obtained from the spectra of MoS(2)/[unknown]-alumina reference samples. Moreover, Mo-S and Mo-Mo coordination numbers were maximum for the sample with an atomic ratio of Co to (Co + Mo) of 0.33; this sample was also the most active catalyst tested.

show abstract

In Situ EXAFS of CoMo/γ -Al2O3 Catalysts During Hydrodesulfurization of Benzothiophene

Cited by 4 publications

References 4 publications

In Situ XAFS Spectroscopic Studies of Direct Coal Liquefaction Catalysts

In Situ XAFS Spectroscopic Studies of Direct Coal Liquefaction Catalysts

In-situ studies of catalysts by XAFS and Mössbauer spectroscopy

Study by Synchrotron Radiation of the Structure of a Working Catalyst at High Temperatures and Pressures

Contact Info

Product

Resources

About