IR study of active sites for n-heptane isomerization over MoO3-ZrO2
The property of acidic sites onMoO3-ZrO2 was studied for n-heptane isomerization.A2,6-lutidine IRstudy 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 d...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2011
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/71284/ http://irep.iium.edu.my/71284/ http://irep.iium.edu.my/71284/ http://irep.iium.edu.my/71284/6/71284%20IR%20study%20of%20active%20sites.pdf |
| Summary: | The property of acidic sites onMoO3-ZrO2 was studied for n-heptane isomerization.A2,6-lutidine IRstudy
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 |
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