Deactivation of PT-ZSM-5 for selective reduction of NO

Journal Article · Sun Dec 31 04:00:00 EST 1995 · Preprints of Papers, American Chemical Society, Division of Fuel Chemistry

OSTI ID:460145

Kharas, K C.C.; Robota, H J ^[1]; Liu, D J ^[2]; Datye, A K ^[3]

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1. AlliedSignal Environmental Catalysts, Tulsa, OK (United States)
2. AlliedSignal Research and Technology, Des Plaines, IL (United States)
3. Univ. of New Mexico, Albuquerque, NM (United States)

Recent reports suggest the use of Pt-ZSM-5 with hydrocarbons to reduce NO selectively under oxidizing conditions and our laboratories, among others are investigating the use of Pt-zeolites to reduce NOx in the emission of Diesel or gasoline lean-burn vehicles. Here we consider the activity of Pt-ZSM-5, both as a fresh catalyst and after deactivation, and characterize a troubling aspect of catalyst deactivation. In severely deactivated materials, TEM reveals a film to have formed over Pt metal; we suggest this film is siliceous material derived from the zeolite and that an important mode of catalyst deactivation is due to geometric site blockage by this film.

• OSTI ID: 460145
• Report Number(s): CONF-950801--
• Journal Information: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry, Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry Journal Issue: 4 Vol. 40; ISSN 0569-3772; ISSN ACFPAI
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CATALYTIC EFFECTS
EXHAUST GASES
GASOLINE
NITRIC OXIDE
PLATINUM
SELECTIVE CATALYTIC REDUCTION
VEHICLES
ZEOLITES