Mechanism and site requirements for NO oxidation on Pd catalysts

• Published in: Journal of catalysis Vol. 272; no. 1; pp. 74 - 81
• Main Authors: Weiss, Brian M., Iglesia, Enrique
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 25.05.2010; Elsevier; Elsevier BV
• Subjects: Catalysis; Catalysts; Chemistry; Cluster size effects; Exact sciences and technology; General and physical chemistry; Lean NO x traps; Nitric oxide; NO x storage; Oxidation; Oxidation catalysis; Palladium; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Lean NO x traps; Palladium; Cluster size effects; Oxidation catalysis; Nitric oxide; NO x storage; Water; NO; Activation; Combustion; Supported catalyst; Mechanism; Size effect; Oxidation; Catalysis; Dissociation; Inhibition; Adsorbent; Platinoid; Binding; Nitrogen oxide; Oxygen; Catalytic reaction; Vacancy; Lean NO; Kinetic method; Transition metal; Trap; Steady state; Heterogeneous catalysis; traps; Storage; Adsorption; Chemical potential; Kinetics; Catalyst; Effluent

O 2 activation on scarce vacancy sites in PdO clusters limits NO oxidation rates. The kinetic relevance of these vacancies causes turnover rates to increase as oxygen binding weakens with increasing cluster size and as adsorbents deplete NO 2 near active sites. Kinetic and isotopic methods were used...