Journal
APPLIED SURFACE SCIENCE
Volume 574, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151565
Keywords
Exhaust gas treatment; Adsorbent; Catalyst; VOCs oxidation; Fe-ZSM-5
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Korea government (MSIT) [2021R1F1A1046312]
- Korea Basic Science Institute [D110100]
- National Research Council of Science & Technology (NST), Republic of Korea [D110100] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2021R1F1A1046312] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The combination of a pre-filter and a conventional catalytic converter is effective in reducing cold-start emissions. Using CVD to load catalytically active Fe species on H-ZSM-5 zeolite enhances the oxidation activity of acetaldehyde, ultimately improving the catalytic conversion efficiency of exhaust purification systems.
In exhaust gas purification systems, the use of an inorganic porous 'pre-filter' in combination with a conventional catalytic converter with Pt-group metal nanoparticles is considered to be effective for reducing cold-start emissions. Organic compounds that are difficult to catalytically oxidize at low temperatures can be captured to this 'pre-filter' until the Pt-group catalyst has reached its operating temperature. In the present work, a simple chemical vapor deposition (CVD) method was applied to load catalytically active Fe species (Fe(III) ions, Fe (III)(x)O-y clusters, and Fe2O3 nanoparticles) on a commercial MFI type H-ZSM-5 zeolite. The CVD could maintain the adsorption performance of H-ZSM-5 zeolite, but more importantly enhance the catalytic oxidation activity of acetaldehyde. The adsorbed acetaldehyde was oxidized with high efficiency on Fe ion & oxide loaded H-ZSM-5 (Fe-ZSM-5), which eventually can reduce cold-start emissions and improve the catalytic conversion efficiency of exhaust purification systems. Furthermore, based on in-situ DRIFTS analyses, surface poisoning of H-ZSM-5 that was induced by accumulation of coke could be eliminated by CVD of Fe ion & oxide.
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