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Effect of metal ions doping (M = Ti4+, Sn4+) on the catalytic performance of MnOx/CeO2 catalyst for low temperature selective catalytic reduction of NO with NH3

Paper ID Volume ID Publish Year Pages File Format Full-Text
39317 45817 2015 11 PDF Available
Title
Effect of metal ions doping (M = Ti4+, Sn4+) on the catalytic performance of MnOx/CeO2 catalyst for low temperature selective catalytic reduction of NO with NH3
Abstract

•Effects of Ti4+, Sn4+ doping on the NH3–SCR activity of MnOx/CeO2 are investigated.•The activity and sulfur-resistance of the catalyst are improved by the doping.•It is due to enhanced surface area, OSC and surface acidity of Mn/CeTi and Mn/CeSn.•The SCR activity is promoted by the dual redox cycles in the modified catalysts.

Ceria-based solid solutions were synthesized and used as supports to prepare MnOx/Ce0.8Ti0.2O2 and MnOx/Ce0.8Sn0.2O2 catalysts (Mn/CeTi and Mn/CeSn) for low temperature selective catalytic reduction of NO by NH3. The effects of Ti or Sn doping on the catalytic performance of MnOx/CeO2 catalyst were investigated. Experimental results show that doping of Ti or Sn increases the NO removal efficiency of MnOx/CeO2. The NO conversion of Mn/CeTi catalyst is more than 90% at temperature window of 175–300 °C under a gas hour space velocity of 60,000 mL g−1 h−1. Modified catalysts are also found to exhibit greatly improved resistance to sulfur-poisoning. Characterization results indicate that doping of Ti or Sn brings about catalysts with higher BET surface area, enhanced oxygen storage capacity and increased surface acidity. X-ray photoelectron spectroscopy (XPS) analysis of spent catalysts following SCR reaction in the presence of SO2 verify that the loss of surface Mn species was inhibited by doping of Ti, which contributes to extend the sulfur durability. The SCR activity is considered as well to be promoted by the dual redox cycles in Mn/CeTi (Mn4+ + Ce3+ ↔ Mn3+ + Ce4+, Ce4+ + Ti3+ ↔ Ce3+ + Ti4+) and Mn/CeSn (Mn4+ + Ce3+ ↔ Mn3+ + Ce4+, 2Ce4+ + Sn2+ ↔ 2Ce3+ + Sn4+) catalysts.

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Keywords
Ceria-based solid solution; Ti (Sn) doping; Mn based catalyst; Low temperature NH3–SCR reaction
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Effect of metal ions doping (M = Ti4+, Sn4+) on the catalytic performance of MnOx/CeO2 catalyst for low temperature selective catalytic reduction of NO with NH3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 495, 5 April 2015, Pages 206–216
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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