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Title: Autonomous kinetic oscillations during NO + C{sub 2}H{sub 4} + O{sub 2} reaction over Pt-ZSM-5 under highly oxidizing conditions

Abstract

This work has investigated, using a packed-bed laboratory reactor, the steady-state behavior of a Pt-ZSM-5 catalyst for the NO + C{sub 2}H{sub 4} + O{sub 2} reaction under highly oxidizing conditions, typical of lean-burn gasoline engine exhaust. Results have revealed very unusual kinetic behavior near the reaction lightoff temperature. For the first time, The authors have observed sustained kinetic oscillations, induced by the presence of NO, in the steady-state rate of the NO + C{sub 2}H{sub 4} + O{sub 2} reaction. The pattern of the oscillation was found to be very sensitive to catalyst temperature and feed composition. The steady-state rate of the NO + C{sub 2}H{sub 4} + O{sub 2} reaction is inhibited by NO and exhibits a strong kinetic isotope effect; the inhibition effect of {sup 15}NO is much greater than that of {sup 14}NO. Possible mechanisms of the observed kinetic oscillations are discussed on the basis of both the kinetic inhibition effect of NO on the catalytic surface and the surface phase transition of Pt induced by adsorbed NO. 52 refs., 7 figs., 1 tab.

Authors:
; ;  [1]
  1. General Motors Research & Development Center, Warren, MI (United States)
Publication Date:
OSTI Identifier:
183472
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 157; Journal Issue: 1; Other Information: PBD: Nov 1995
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 02 PETROLEUM; 40 CHEMISTRY; NITRIC OXIDE; CHEMICAL REACTION KINETICS; ETHYLENE; OXYGEN; ZEOLITES; CATALYTIC EFFECTS; PLATINUM; CATALYSTS; PHASE TRANSFORMATIONS; CATALYST SUPPORTS; OXIDATION

Citation Formats

Cho, B.K., Rahmoeller, K.M., and Yie, J.E. Autonomous kinetic oscillations during NO + C{sub 2}H{sub 4} + O{sub 2} reaction over Pt-ZSM-5 under highly oxidizing conditions. United States: N. p., 1995. Web. doi:10.1006/jcat.1995.1263.
Cho, B.K., Rahmoeller, K.M., & Yie, J.E. Autonomous kinetic oscillations during NO + C{sub 2}H{sub 4} + O{sub 2} reaction over Pt-ZSM-5 under highly oxidizing conditions. United States. doi:10.1006/jcat.1995.1263.
Cho, B.K., Rahmoeller, K.M., and Yie, J.E. Wed . "Autonomous kinetic oscillations during NO + C{sub 2}H{sub 4} + O{sub 2} reaction over Pt-ZSM-5 under highly oxidizing conditions". United States. doi:10.1006/jcat.1995.1263.
@article{osti_183472,
title = {Autonomous kinetic oscillations during NO + C{sub 2}H{sub 4} + O{sub 2} reaction over Pt-ZSM-5 under highly oxidizing conditions},
author = {Cho, B.K. and Rahmoeller, K.M. and Yie, J.E.},
abstractNote = {This work has investigated, using a packed-bed laboratory reactor, the steady-state behavior of a Pt-ZSM-5 catalyst for the NO + C{sub 2}H{sub 4} + O{sub 2} reaction under highly oxidizing conditions, typical of lean-burn gasoline engine exhaust. Results have revealed very unusual kinetic behavior near the reaction lightoff temperature. For the first time, The authors have observed sustained kinetic oscillations, induced by the presence of NO, in the steady-state rate of the NO + C{sub 2}H{sub 4} + O{sub 2} reaction. The pattern of the oscillation was found to be very sensitive to catalyst temperature and feed composition. The steady-state rate of the NO + C{sub 2}H{sub 4} + O{sub 2} reaction is inhibited by NO and exhibits a strong kinetic isotope effect; the inhibition effect of {sup 15}NO is much greater than that of {sup 14}NO. Possible mechanisms of the observed kinetic oscillations are discussed on the basis of both the kinetic inhibition effect of NO on the catalytic surface and the surface phase transition of Pt induced by adsorbed NO. 52 refs., 7 figs., 1 tab.},
doi = {10.1006/jcat.1995.1263},
journal = {Journal of Catalysis},
number = 1,
volume = 157,
place = {United States},
year = {1995},
month = {11}
}