A5057302760- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Nanomaterials for catalytic reactions
- Zeolite Catalysis and Synthesis
- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
- Advanced Nanomaterials in Catalysis
- Nanocluster Synthesis and Applications
- Catalysis and Hydrodesulfurization Studies
Purdue University West Lafayette
2016-2022
Copper ions exchanged into zeolites are active for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) with ammonia (NH3), but low-temperature rate dependence on copper (Cu) volumetric density is inconsistent reaction at single sites. We combine steady-state and transient kinetic measurements, x-ray absorption spectroscopy, first-principles calculations to demonstrate that under conditions, mobilized Cu can travel through zeolite windows form ion pairs participate in an oxygen...
The relationships among the macroscopic compositional parameters of a Cu-exchanged SSZ-13 zeolite catalyst, types and numbers Cu active sites, activity for selective catalytic reduction (SCR) NOx with NH3 are established through experimental interrogation computational analysis materials across catalyst composition space. Density functional theory, stochastic models, characterizations demonstrate that within synthesis protocols applied here Si:Al ratios, volumetric density six-membered-rings...
Theory and experiment reveal relationships between observed UV-visible spectra ion exchange site types, nuclearity, finite-temperature dynamics in Cu exchanged chabazite (SSZ-13) zeolites.
Cu in aged zeolites changes structure during SCR.
In this contribution, we synthesized three model Cu-SSZ-13 catalysts with primarily ZCuOH, Z2Cu, and extraframework CuxOy species then measured their N2O formation rates during standard selective catalytic reduction (SCR). We first present evidence that the of after sequential aqueous ion exchange calcination correlates Cu(OH)2 precipitates exchange. These are not active for SCR, unchanged apparent activation energies reaction orders demonstrate these do induce transport limitations to...