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Hydrogen Selective Catalytic Reduction of Nitrogen Oxide on Pt- and Pd-based Catalysts for Lean-Burn Automobile Applications
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 15, 2020 by SAE International in United States
The utilization of H2 to catalytically treat NO emissions under lean-burn conditions was studied on Pt- and Pd-containing catalysts supported on CeO2 and MgO. The catalytic performance was examined using a fixed-bed reactor whose dry effluent gas stream was analyzed by an online FTIR analyzer. The catalysts NO conversion and N2 selectivity were measured in the range of 125-300⁰C with a feed gas composition of 0.05%NO/1%H2/10%O2/N2. The CeO2-based catalysts exhibited higher NO conversion, and the most effective catalyst was Pd/CeO2, with an NO conversion of 67% and an N2 selectivity of 70% near 230⁰C. The prepared solids were characterized using different techniques (BET, ICP-OES, CO pulse chemisorption, STEM, EELS and EDS) to correlate the structural and morphological properties of the metallic phase and the support with the catalytic activity. Compared to MgO, CeO2 is a more effective support as it yields higher metal dispersion and better facilitates the reduction of Pt and Pd.
- Nawaf M. Alghamdi - King Abdullah University of Science & Technology
- Juan Restrepo Cano - King Abdullah University of Science & Technology
- Dalaver H. Anjum - King Abdullah University of Science & Technology
- Hong G. Im - King Abdullah University of Science & Technology
- Christos Kalamaras - Saudi Aramco R&D Center
- Jorge Gascon - King Abdullah University of Science & Technology
- S. Mani Sarathy - King Abdullah University of Science & Technology