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The effect of C(s) on the trapping of NOx onto Pt/Ba/Al2O3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
47232 46464 2010 7 PDF Available
Title
The effect of C(s) on the trapping of NOx onto Pt/Ba/Al2O3 catalysts
Abstract

Pt/BaO/Al2O3 catalysts react with NO/O2 mixtures to form barium nitrites and nitrates. In the presence of small amounts of C(s) admixed with the catalyst the concentrations of NOx adsorbed is considerably reduced and the stability of the stored NOx is decreased. These results suggest that there are important implications for any attempts to combine NSR and particulate combustion systems within a single catalytic system. Furthermore, it is clear that there are significant concentrations of mobile NOx species present in the environs of the NOx trap prior to fixation on BaO, i.e. the transfer between NO2 formed on the Pt component of the trap and the “fixed” NOx in Ba(NO3)2 involves significant concentrations of gaseous or surface mobile NO2.

Research highlights▶ Soot prevents NSR traps from performing optimally. ▶ Less NOx is trapped. ▶ Stored NOx is less stable. ▶ The effect is seen at very low levels of soot. ▶ NO2 is mobile before being trapped on an NSR trap.

Keywords
NOx trap; Particulate combustion; 4-Way catalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 99, Issues 1–2, 31 August 2010, Pages 235–241
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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