Adsorbent/catalyst bi-functional Fe-ZSM-5 prepared by a simple CVD process for exhaust gas treatment

[Display omitted] •Catalytically active Fe species were loaded to commercial H-ZSM-5 zeolite via a simple CVD.•The CVD could maintain adsorption property of H-ZSM-5 while it significantly enhanced catalytic performance.•Surface poisoning induced by coke accumulation on H-ZSM-5 surface was eliminated...

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Veröffentlicht in:Applied surface science 2022-02, Vol.574, p.151565, Article 151565
Hauptverfasser: Cha, Byeong Jun, Choi, Ji Yoon, Kim, Soong Yeon, Kim, Young Dok
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Sprache:eng
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Zusammenfassung:[Display omitted] •Catalytically active Fe species were loaded to commercial H-ZSM-5 zeolite via a simple CVD.•The CVD could maintain adsorption property of H-ZSM-5 while it significantly enhanced catalytic performance.•Surface poisoning induced by coke accumulation on H-ZSM-5 surface was eliminated by the CVD. 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)xOy 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.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2021.151565