IR study of active sites for n-heptane isomerization over Moo3-Zro2

• Main Authors: Ruslan, Nurun Najwa, Ahmad Fadzlillah, Nurrulhidayah, Karim, Ainul Hakimah, Aishah, Abdul Jalil, Triwahyono, Sugeng
• Format: Article
• Published: Elsevier BV 2011
• Subjects: QD Chemistry
• Online Access: http://eprints.utm.my/id/eprint/45009/
• Institution: Universiti Teknologi Malaysia

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.