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The influence of silicon on the catalytic properties of Cu/SAPO-34 for NOx reduction by ammonia-SCR

Paper ID Volume ID Publish Year Pages File Format Full-Text
46271 46436 2012 11 PDF Available
Title
The influence of silicon on the catalytic properties of Cu/SAPO-34 for NOx reduction by ammonia-SCR
Abstract

The effect of Si content in SAPO-34 on NO selective catalytic reduction over Cu/SAPO-34 catalyst was investigated. Three fresh catalysts with different Si contents, prepared by the same procedure, showed different NO conversions from 120 °C to 600 °C. These catalysts were characterized in detail by various techniques (ICP, XRD, SEM, NMR, NH3-TPD, H2-TPR and EPR). The NH3-TPD results indicate that the number of acid sites in Cu/SAPO-34 catalyst increases with increasing Si contents and the SCR activities of the samples correlate well with the number of acidic sites at low temperatures (200 °C). The EPR and H2-TPR results show that both the Si and the Al contents affect the number of isolated Cu2+ ions in Cu/SAPO-34 catalysts. The catalysts aged at 750 °C for 12 h showed higher SCR activities than those of the untreated samples, consistent with the higher numbers of the isolated Cu2+ ions.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Cu/SAPO-34 performs excellent SCR activity and good hydrothermal stability. ► The contents of Si can directly affect the structure of Cu/SAPO-34 catalysts. ► The Cu loading depends on both the Si contents and the Al contents of HSAPO-34. ► The density of the acidity of Cu/SAPO-34 is affected by the Si contents. ► The Si and Al contents affect the environment of Cu2+ species in Cu/SAPO-34.

Keywords
Cu/SAPO-34; Si content; NH3-SCR; EPR; NMR
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The influence of silicon on the catalytic properties of Cu/SAPO-34 for NOx reduction by ammonia-SCR
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 127, 30 October 2012, Pages 137–147
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
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