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H2-SCR of NO on Pt–MnOx catalysts: Reaction path via NH3 formation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41511 45891 2011 9 PDF Available
Title
H2-SCR of NO on Pt–MnOx catalysts: Reaction path via NH3 formation
Abstract

Pt–MnOx catalysts without any alkali or transition metals were prepared and their performance in the selective catalytic reduction (SCR) of NO by H2 was examined. Their physicochemical properties were investigated using X-ray diffraction (XRD), extended X-ray adsorption fine structure (EXAFS), and X-ray photoelectron spectroscopy (XPS). The adsorption and removal of NO during H2-SCR were monitored by an in situ FT-IR spectrophotometer. The co-presence of MnO and MnO2 on Pt–MnOx was confirmed by EXAFS and XPS. NO was adsorbed on them as nitrate and nitrite, which were subsequently transformed to NHx species by the introduction of H2. The NHx species adsorbed on the acid sites of manganese oxide were active in the reduction of NO, although a direct reduction by H2 was also possible. The conversion of NO over the Pt(2.0)–MnOx catalyst was maximized to 64% at around 100 °C and fell with further increases in temperature. The N2 yield over the Pt(2.0)–MnOx catalyst was 30% at the same condition, indicating that about a half of NO was converted to N2. On the contrary, the Pt(2.0)/SiO2 catalyst exhibited very low N2 yield, 10%, because N2O was highly produced. The reaction between the hydrogen atoms activated on the platinum and the activated NO on the manganese oxide was considered essential for H2-SCR, and NH3 that formed as an intermediate effectively participated to the selective reduction.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (207 K)Download as PowerPoint slideResearch highlights► Prepared Pt–MnOx catalysts are active in the formation of NH3 from NOx and H2. ► They effectively reduce NOx by using supplied H2 or produced NH3. ► Manganese oxide and platinum show a synergistic effect in H2-SCR of NOx.

Keywords
Manganese oxide; Platinum impregnation; H2-SCR; NO; NH3 formation
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H2-SCR of NO on Pt–MnOx catalysts: Reaction path via NH3 formation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 395, Issues 1–2, 15 March 2011, Pages 120–128
Authors
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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