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IR study of active sites for n-heptane isomerization over MoO3-ZrO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
41228 45881 2011 11 PDF Available
Title
IR study of active sites for n-heptane isomerization over MoO3-ZrO2
Abstract

The property of acidic sites on MoO3-ZrO2 was studied for n-heptane isomerization. A 2,6-lutidine IR study showed that the introduction of MoO3 on ZrO2 partially eliminated the absorbance band at 1605 cm−1 ascribed to Lewis acid sites corresponding to the presence of the monoclinic phase of ZrO2 and developed several Brönsted and Lewis acid sites with different acidic strengths. MoO3-ZrO2 possesses a large number of relatively weak Lewis and Brönsted acid sites as well as strong acid sites. The active protonic acid sites in n-heptane isomerization were formed from molecular hydrogen through a spillover mechanism with the involvement of doublet bands at 1595 and 1580 cm−1 ascribed to the Lewis acid sites corresponding to the presence of the tetragonal phase of ZrO2. No catalytic activity of MoO3-ZrO2 for n-heptane isomerization was observed in the absence of the doublet bands at 1595 and 1580 cm−1 and hydrogen in the gas phase.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (161 K)Download as PowerPoint slideHighlights► MoO3-ZrO2 possesses Brönsted and Lewis acid sites with different acidic strength. ► Bands at 1605 and 1590 cm−1 are Lewis acid sites corresponding to monoclinic ZrO2 ► Bands at 1595 and 1580 cm−1 are Lewis acid sites corresponding to tetragonal ZrO2. ► Only a doublet bands at 1595 and 1580 cm−1 involved in the formation of H+ from H2. ► No activity was observed in the absence of a doublet bands at 1595 and 1580 cm−1.

Keywords
MoO3-ZrO2; Lewis acid sites; Protonic (Brönsted) acid sites; Monoclinic ZrO2; Tetragonal ZrO2
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IR study of active sites for n-heptane isomerization over MoO3-ZrO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 406, Issues 1–2, 18 October 2011, Pages 102–112
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