Hydrogen Selective Catalytic Reduction of Nitrogen Oxide on Pt-and Pd-Based Catalysts for Lean-Burn Automobile Applications

Nawaf M. Alghamdi, Juan Restrepo Cano, Dalaver H. Anjum, Hong G. Im, Christos Kalamaras, Jorge Gascon, Mani Sarathy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The utilization of H2 to catalytically treat NO emissions under lean-burn engine exhaust 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 a conversion of 67% and 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. CeO2 is a more effective support as it yields higher metal dispersion and better facilitates the reduction of the Pt and Pd catalysts.
Original languageEnglish (US)
Title of host publicationSAE Technical Paper Series
PublisherSAE International
DOIs
StatePublished - Sep 16 2020

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