STUDIES OF THE KINETICS AND MECHANISM OF AMMONIA SYNTHESIS AND HYDRODESULFURIZATION ON METAL SINGLE CRYSTAL SURFACES.

A. Gellman*, M. Asscher, G. A. Somorjai

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

This paper reports on the ammonia synthesis study over rhenium single crystal surfaces, under pressure conditions approaching those used industrially (20 atmospheres). Found was an unprecedented structure sensitivity for this reaction on different faces: The Re(0001) basal plane is practically inactive, within our detection limits, while the open Re(112 OVER BAR 0) crystal plane was found to be more active than the most active iron single crystal surface. The Re(10 OVER BAR 0) surface was studied as well and found to be only slightly active. The activity ratio at a crystal temperature of 870 K being 1:50:1700 for the Re(0001), Re(101 OVER BAR 0) and the Re(112 OVER BAR ) planes, respectively. The very small detectable activity of the Re(0001) probably arises from the crystal edges. The activation energies for NH//3 synthesis on both the Re(112 OVER BAR 0) and the polycrystalline foil were found to be the same, e. g. 20 plus 1 kcal/mole, which is very close to the value found on the Fe(111) crystal, e. g. , 19. 4 kcal/mole.

Original languageEnglish
Pages (from-to)754-759
Number of pages6
JournalAmerican Chemical Society, Division of Petroleum Chemistry, Preprints
Volume29
Issue number3
StatePublished - Aug 1984
Externally publishedYes

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