The role of the structure of iron-ruthenium bimetallic catalysts in the CO + H2 reaction

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Abstract

The catalytic conversion of CO + H2 has been investigated over iron ruthenium catalysts prepared by evaporation under UHV to form bimetallic films, or by using Cab-O-Sil and Al2O3 oxide supports impregnated to incipient wetness from RuCl3 and Fe/NO3/3 and by deposition and decomposition of Fe3/CO/12 and Ru3/CO/12 as well as from Fe2Ru/CO/12 and H2FeRu3/CO/13. The structures of the catalysts have been examined by several methods, such as AES and SIMS, in situ Mössbauer spectroscopy, temperature programmed reduction/TPR/ and desorption/TPD/. It has been established that the final optimum catalyst performance is determined by 1) surface reactive carbon, /Cm/ which propagates the formation of higher hydrocarbons; immobil carbon, /Ci/ which is responsible for methane formation; carbidic carbon, /Cc/ which causes deactivation of the metallic surface; oxidic species /FeII and FeIII oxide/ and finally chemisorbed hydrogen atoms; 2) metal support interactions as well as the presence of ruthenium influence mainly the amount and the nature of hydrogen available for the hydrogenation; 3) the optimum catalyst performance is determined by an additional factor counterbalancing the hydrogen effect, i. e. the metal-carbon bond strength. Accordingly, if it is too strong, as it is for UHV deposited Fe-Ru bimetallic films, no reaction takes place.

Original languageEnglish
Number of pages1
JournalPreprints Symposia
Volume29
Issue number2
Publication statusPublished - Dec 1 1984

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ASJC Scopus subject areas

  • Fuel Technology

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