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Showing 1 to 8 of 8 for “"ssz-13"”.
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Reaction and Transport Coupling in Multi-Functional Catalysts for Selective Oxidation of Ammonia to Nitrogen
… a bottom layer of Pt/Al2O3 and a top layer of Cu/SSZ-13. As emission control catalysts experience degradation under the severe operating conditions which can negatively impact the product distribution and conversion. The first part of this dissertation study elucidates the effect of hydrothermal …
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Fundamental studies on copper zeolites for catalytic NO x abatement
… show commercially viable SCR performance. Cu-SSZ-13 (CHA framework), a member of this family, is a preferred catalyst for SCR applications because it shows exceptional hydrothermal stability in addition to commercially viable SCR performance. Our work focuses on 1) determination of the active …
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Exploring the Mechanistic Landscape of Nitric Oxide Oxidation and Ammonia Selective Catalytic Reduction of Nitric Oxide on Cu-Zeolites via Kinetic and Spectroscopic Characterization
… requirements. Small-pore Cu- and Fe-exchanged SSZ-13 catalysts with chabazite (CHA) topology are able to sustain high catalytic rates for selective catalytic reduction (SCR) even after exposure to harsh hydrothermal conditions present in diesel exhaust. Probing the redox behavior and the active …
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Spectroscopic and Kinetic Study of Copper-Exchanged Zeolites for the Selective Catalytic Reduction of NOx with Ammonia
… emission standard goals. Copper-exchanged SSZ-13 (Cu-SSZ-13), the small-pore zeolite in this study, has been shown to be very hydrothermally stable and active under conditions presented in the exhaust of the lean-burn diesel engine. In this work, detailed studies were performed to identify …
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First-principles molecular modeling of structure-property relationships and reactivity in the zeolite chabazite
… were calculated on a periodic chabazite (SSZ-13) model with various loadings of acid sites per unit cell, and with various structural framework defects. The four acidic oxygens at the aluminum T-site were found to all have roughly the same proton affinity, and the deprotonation energy is …
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Applied and Fundamental Studies of LNT-SCR Dual-layer Monolithic Catalysts for Lean NOx Emission Control
… effects of reductants (CO, H2 and C3H6) on Cu-SSZ-13 catalyzed NH3-SCR as the SCR component in the combined system is periodically exposed to a rich exhaust. The three reductants affect to different extent the NH3-SCR reactions. Propylene is most effective in promoting NO2 reduction to NO by …
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Understanding Heterogenous Catalysis on Zeolites and Manganese Oxides
… profile for different chain-sized alkynes in Cu-SSZ-13 was studied, using DFT and biased MD calculations. The results unequivocally show that the alkyne with size most commensurable to the hole to be thermodynamically favoured to adsorb. In addition, the elongation of the chain by just one …