Journal
CATALYSIS TODAY
Volume 402, Issue -, Pages 115-121Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2022.03.025
Keywords
Nitrogen oxides; H2-SCR; PtIr; TiO2; In-situ DRIFTS
Funding
- National Natural Science Foundation of China [21876009, 21611130170]
- Beijing Municipal Natural Science Foundation [8162030]
- National Engineering Laboratory for Mobile Source Emission Control Technology [NELMS2019A18]
- Fundamental Research Funds for the Central Universities [JD2110, PY2103]
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PtIr/TiO2 catalyst exhibits higher activity and wider temperature range in H2-SCR process. The optimum mass ratio of Pt/Ir is 1:1. Characterization of the catalyst reveals the presence of metallic Pt and Ir on PtIr/TiO2, as well as the formation of more active species.
PtIr/TiO2 catalyst was prepared and investigated for the selective catalytic reduction of NOx by H2 (H2-SCR) in the presence of O2. It was found that PtIr/TiO2 exhibited higher H2-SCR activity as well as wider activity tem-perature window than Pt/TiO2 and Ir/TiO2 catalysts, and the optimum mass ratio of Pt/Ir was 1:1. Character-ization of the catalyst showed that metallic Pt and Ir were generated on PtIr/TiO2, both of which were favorable active sites in H2-SCR process. In situ DRIFTS studies showed that more NOx species, NH3 and NH4+ species were formed on PtIr/TiO2. All of these lead to the superior catalytic activity of PtIr/TiO2 catalyst.
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