Studies on zeolite supported Cu/Fe as selective catalytic reduction (SCR) catalysts, and supported Pd as passive NOx adsorbers (PNA)
EMSL Project ID
51265
Abstract
To help meet DOE goals of enabling more fuel-efficient vehicle engine technologies, for the past ~15 years we have been carrying out research programs funded by DOE/Office of Energy Efficiency and Renewable Energy (EERE)/Vehicle Technologies Office (VTO), involving programs that include direct collaboration with industry partners in the form of CRADA programs, and more fundamental programs directly funded by VTO. Currently, the industry-partner CRADA programs with Cummins, Inc. and FCA aim at (1) understanding mechanisms of low-temperature constrains of selective catalytic reduction (SCR) of NOx catalyzed by small-pore zeolite supported Cu/Fe catalysts, and improving long-term stability of industrial SCR catalysts (primarily Cu/SSZ-13); and (2) lowering NOx emissions during vehicle cold start by invoking novel passive NOx adsorber (PNA) materials. For these programs to be successful, we rely on the use of a wide array of state-of-the-art catalyst characterization facilities in EMSL. Defect deficient beta zeolite materials will be synthesized as supports for Fe SCR catalysts. Small-pore zeolites SSZ-13, SSZ-16, SSZ-17 and SSZ-39 supported Pd will be developed as PNA materials. This project will also leverage previous work at PNNL engaged in developing active and stable noble metal based materials/catalysts for use in biomass upgrading and engine exhaust cleanup. For example, novel small pore zeolite supported Cu catalysts will be developed as alternatives to the current industrial Cu/SSZ-13 SCR catalyst with potentially improved performance and stability. This proposal contains the following essential components: (1) Large-pore beta zeolites, small-pore SSZ-family zeolites and zeolite supported metal materials synthesis; (2) material/catalyst performance evaluation using our home-built plug-flow reaction systems with MKS gas-phase FTIR analyzers; (3) in situ/operando spectroscopic and microscopic characterizations, e.g., solid-state nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR), X-ray photoelectron (XPS), Mossbauer and FTIR spectroscopies, scanning transmission electron microscopy (STEM), with EMSL support; (4) density functional theory (DFT) calculations in support of the experimental work performed with a mixed Gaussian and plane wave basis sets implemented in the CP2K code. Expected outcomes include 3-5 high impact journal publications, 3-5 national and international conference presentations and annual reports to DOE/EERE/VTO acknowledging the essential support from EMSL.
Project Details
Start Date
2020-01-01
End Date
2020-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members