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In situ structure–activity correlation experiments of the ruthenium catalyzed CO oxidation reaction

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Title: In situ structure–activity correlation experiments of the ruthenium catalyzed CO oxidation reaction
Authors: Over, H.1, Balmes, O.2, Lundgren, E.3
Source: Catalysis Today. Jul2009, Vol. 145 Issue 3/4, p236-242. 7p.
Subjects: Structure-activity relationships, Statistical correlation, Chemistry experiments, Ruthenium, Metal catalysts, Oxidation, Chemical reactions, X-ray diffraction
Abstract: Abstract: The complex structure–activity correlation of the CO oxidation on ruthenium has been studied in a batch reactor by using in situ surface X-ray diffraction (SXRD) and on-line mass spectrometry. Two distinct active phases are identified at higher pressures in the mbar range depending on the reaction conditions: a non-oxidic phase and a RuO2(110) layer of variable thickness ranging from 1.5nm to 10nm. For reaction temperatures lower than 520K the experimental turnover frequency (TOF) numbers are shown to be almost identical for the two types of active phases. Above 520K the RuO2(110) layer turned out to be much more active than the non-oxidic phase. Kinetic reaction experiments on the RuO2(110) phase reveal an activation energy of 78±10kJ/mol which is in perfect agreement with corresponding reactivity experiments on supported and powder RuO2 catalyst. Under oxidizing reaction conditions and high concentration of CO2 in the gas mixture, the RuO2(110) model catalyst shows reversible product-poisoning. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: The complex structure–activity correlation of the CO oxidation on ruthenium has been studied in a batch reactor by using in situ surface X-ray diffraction (SXRD) and on-line mass spectrometry. Two distinct active phases are identified at higher pressures in the mbar range depending on the reaction conditions: a non-oxidic phase and a RuO2(110) layer of variable thickness ranging from 1.5nm to 10nm. For reaction temperatures lower than 520K the experimental turnover frequency (TOF) numbers are shown to be almost identical for the two types of active phases. Above 520K the RuO2(110) layer turned out to be much more active than the non-oxidic phase. Kinetic reaction experiments on the RuO2(110) phase reveal an activation energy of 78±10kJ/mol which is in perfect agreement with corresponding reactivity experiments on supported and powder RuO2 catalyst. Under oxidizing reaction conditions and high concentration of CO2 in the gas mixture, the RuO2(110) model catalyst shows reversible product-poisoning. [Copyright &y& Elsevier]
ISSN:09205861
DOI:10.1016/j.cattod.2008.10.048