Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/1677
Title: An investigation of the NO/H2/O2 (Lean De-NOx) reaction on a highly active and selective Pt/La0.7Sr0.2Ce0.1FeO3 catalyst at low temperatures
Authors: Andronikou, Ch. 
Costa, Costas 
Savva, Petros G. 
Major Field of Science: Natural Sciences
Field Category: Chemical Sciences
Keywords: Catalysts;Low temperatures
Issue Date: 25-Jun-2002
Source: Journal of Catalysis, 2002, vol. 209, no. 2, pp. 456–471
Volume: 209
Issue: 2
Start page: 456
End page: 471
Journal: Journal of Catalysis 
Abstract: A 0.1 wt% Pt supported on La0.7Sr0.2Ce0.1FeO3 solid (mixed oxide containing LaFeO3, SrFeO3-x, CeO2, and Fe2O3 phases) has been studied for the NO/H2/O2 reaction in the 100-400°C range. For a critical comparison, 0.1 wt% Pt was supported on SiO2, CeO2, and Fe2O3 and tested under the same reaction conditions. For the Pt/La0.7Sr0.2Ce0.1FeO3 catalyst a maximum in the NO conversion (83%) has been observed at 150°C with a N2 selectivity value of 93%, while for the Pt/SiO2 catalyst at 120°C (82% conversion) with a N2 selectivity value of 65% using a GHSV of 80,000 h-1 Low N2 selectivity values, less than 45%, were obtained with the Pt/CeO2 and Pt/Fe2O3 catalysts in the 100-400°C range. For the Pt/La0.7Sr0.2Ce0.1FeO3 catalyst, addition of 5% H2O in the feed stream at 140°C resulted in a widening of the operating temperature window with appreciable NO conversion and no negative effect on the stability of the catalyst during 20 h on stream. In addition, a remarkable N2 yield (93%) after 20 h on 0.25% NO/1% H2/5% O2/5% H2O/He gas stream at 140°C has been observed. Remarkable N2 selectivity values in the range of 80-90% have also been observed in the 100-200°C low-temperature range either in the absence or in the presence of water in the feed stream. A maximum specific integral reaction rate of 443.5 μmol N2/s·g of Pt metal was measured at 160°C during reaction with a 0.25% NO/1% H2/5% O2/5% H2O/He gas mixture. This value is higher by 90% than the corresponding one observed on the 0.1 wt% Pt/SiO2 catalyst at 120°C and it is the highest value ever reported for the reaction at hand in the 100-200°C low-temperature range on Pt-based catalysts. A TOF value of 13.4 × 10-2 s-1 for N2 formation was calculated at 110°C for the Pt/La0.7Sr0.2Ce0.1FeO3 catalyst. Temperature-programmed desorption (TPD) of NO and transient titration experiments of the catalyst surface following NO/H2/O2 reaction have revealed important information concerning the amount and chemical composition of active and inactive (spectator) adsorbed N-containing species present under reaction conditions.
URI: https://hdl.handle.net/20.500.14279/1677
ISSN: 00219517
DOI: 10.1006/jcat.2002.3645
Rights: © Elsevier Science
Attribution-NonCommercial-NoDerivs 3.0 United States
Type: Article
Affiliation: University of Cyprus 
Affiliation : University of Cyprus 
University of Ioannina 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

CORE Recommender
Sorry the service is unavailable at the moment. Please try again later.
Show full item record

SCOPUSTM   
Citations

119
checked on Nov 9, 2023

WEB OF SCIENCETM
Citations 50

112
Last Week
0
Last month
1
checked on Oct 29, 2023

Page view(s)

530
Last Week
1
Last month
0
checked on Feb 13, 2025

Google ScholarTM

Check

Altmetric


This item is licensed under a Creative Commons License Creative Commons