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A Water-Promoted Mars-van Krevelen Reaction Dominates Low-Temperature CO Oxidation over Au-Fe2O3 but Not over Au-TiO2

Holm, Alexander, 1983- (author)
Linköpings universitet,Stockholms universitet,Fysikum,Institutionen för material- och miljökemi (MMK),Linköping University, Sweden,Laboratoriet för organisk elektronik,Tekniska fakulteten,Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden;Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114 18 Stockholm, Sweden
Davies, Bernadette, 1997- (author)
Stockholms universitet,Institutionen för material- och miljökemi (MMK),Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden;Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114 18 Stockholm, Sweden
Boscolo Bibi, Sara, 1993- (author)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
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Moncada, Felix, 1989- (author)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Halldin-Stenlid, Joakim (author)
KBR, Inc., Intelligent Systems Division, NASA Ames Research Center, Moffett Field, California 94035, United States
Paškevičius, Laurynas (author)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Claman, Vincent (author)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Slabon, Adam, 1983- (author)
Stockholms universitet,Institutionen för material- och miljökemi (MMK),Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114 18 Stockholm, Sweden;Inorganic Chemistry, University of Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany
Tai, Cheuk-Wai, 1973- (author)
Stockholms universitet,Institutionen för material- och miljökemi (MMK),Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114 18 Stockholm, Sweden
dos-Santos, Egon Campos (author)
Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Aoba-ku, Sendai 980-8577, Japan
Koroidov, Sergey, 1982- (author)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
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 (creator_code:org_t)
2024
2024
English.
In: ACS Catalysis. - 2155-5435. ; 14:5, s. 3191-3197
Related links:
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We provide experimental evidence that is inconsistent with often proposed Langmuir−Hinshelwood (LH) mechanistic hypotheses for water-promoted CO oxidation over Au–Fe2O3. Passing CO and H2O, but no O2, over Au-γ-Fe2O3 at 25 °C, we observe significant CO2 production, inconsistent with LH mechanistic hypotheses. Experiments with H218O further show that previous LH mechanistic proposals cannot account for water-promoted CO oxidation over Au-γ-Fe2O3. Guided by density functional theory, we instead postulate a water-promoted Mars–van Krevelen (w-MvK) reaction. Our proposed w-MvK mechanism is consistent both with observed CO2 production in the absence of O2 and with CO oxidation in the presence of H218O and 16O2. In contrast, for Au-TiO2, our data is consistent with previous LH mechanistic hypotheses. 

Subject headings

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)

Keyword

CO oxidation
Mars−van Krevelen
Langmuir−Hinshelwood
mechanism
Au Fe2O3
TiO2

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ref (subject category)
art (subject category)

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