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

Ruslan, Nurun Najwa and Ahmad Fadzlillah, Nurrulhidayah and Karim, Ainul Hakimah and Abdul Jalil, Aishah and Triwahyono, Sugeng (2011) IR study of active sites for n-heptane isomerization over MoO3-ZrO2. Applied Catalysis A: General, 406. pp. 102-112. ISSN 0926-860X

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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.

Item Type: Article
Uncontrolled Keywords: MoO3-ZrO2; lewis acid sites; Protonic (Brönsted) acid sites; Monoclinic ZrO2; Tetragonal ZrO2
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Applied Science and Technology > Department of Science
Depositing User: Normajihan Abd. Rahman
Date Deposited: 10 Jan 2017 08:00
Last Modified: 10 Jan 2017 08:00
URI: http://eprints.uthm.edu.my/id/eprint/8164
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