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Hampered PdO Redox Dynamics by Water Suppresses Lean Methane Oxidation over Realistic Palladium Catalysts
Author(s) -
Velin Peter,
Hemmingsson Felix,
Schaefer Andreas,
Skoglundh Magnus,
Lomachenko Kirill A.,
Raj Agnes,
Thompsett David,
Smedler Gudmund,
Carlsson PerAnders
Publication year - 2021
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202100829
Subject(s) - methane , anaerobic oxidation of methane , catalysis , palladium , chemistry , redox , dissociation (chemistry) , oxide , oxygen , inorganic chemistry , adsorption , zeolite , chemical engineering , catalytic combustion , organic chemistry , engineering
By use of operando spectroscopies under cycling reaction conditions, water is shown to hamper the redox dynamics of realistic palladium oxide nanoparticles dispersed onto alumina and hydrophobic zeolite supports thereby lowering the activity for total oxidation of methane. Water adsorption forms hydroxyl ad‐species that block the methane and oxygen dissociation and seem to prevent lattice oxygen to take part in the methane oxidation. The main catalytic action is thus proposed to shift from the Mars‐van Krevelen mechanism in dry conditions to a slower route that relies on Langmuir‐Hinshelwood type of steps in wet conditions. This key finding has clear implications on catalyst design for low‐temperature gas combustion emission control.