fulltext.study @t Gmail

Ce effect on the selective catalytic reduction of NO with CH4 on Pd-mordenite in the presence of O2 and H2O

Paper ID Volume ID Publish Year Pages File Format Full-Text
55689 47062 2011 6 PDF Available
Title
Ce effect on the selective catalytic reduction of NO with CH4 on Pd-mordenite in the presence of O2 and H2O
Abstract

The activity, selectivity and stability of Pd/H-MOR and Ce–Pd/H-MOR catalysts for the selective catalytic reduction of NO with CH4 (SCR-CH4) were studied in O2 excess (4.1%) in the absence and presence of H2O (5%). The reaction was carried out in a 300–650 °C temperature range with a S.V. of ≅33,000 h−1. The characterization of fresh and used catalysts by FTIR spectroscopy of adsorbed CO and NO showed that the loss of NO conversion in H2O presence was due to a decreasing concentration of Pd2+ sites and to the parallel formation of PdO particles that enhanced CH4 combustion under dry conditions. This behavior was modified by Ce addition. Under wet conditions the Ce–Pd/H-MOR catalyst was very active (XNO = 76% at 550 °C), selective (100% of N2) and stable. The FTIR spectrum of CO adsorbed on used samples demonstrated that Ce inhibited the transformation of active Pd2+ into PdO particles. However, Ce presence also enhanced CH4 combustion under wet conditions. At low temperatures (<500 °C) H2O presence inhibited N2O formation and 90% selectivity to N2, which improved with Ce addition, was obtained.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (155 K)Download as PowerPoint slideHighlights► Pd/H-MOR and Ce-Pd/H-MOR catalysts were characterized by FTIR of adsorbed CO and NO. ► The catalysts's activity for SCR-CH4 was studied in the presence and absence of H2O. ► On Pd/H-MOR water lowered the amount of Pd2+ sites and the activity for NO reduction. ► Ce addition stabilized the active Pd2+ sites and enhanced the activity for NO reduction.

Keywords
Selective catalytic reduction of NO; Pd/H-MOR; Ce–Pd/H-MOR; FTIR
First Page Preview
Ce effect on the selective catalytic reduction of NO with CH4 on Pd-mordenite in the presence of O2 and H2O
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 172, Issue 1, 25 August 2011, Pages 84–89
Authors
, , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us