A B S T R A C T
V2O5/SnO2 solid acid catalysts have been employed for the vapour-phase Beckmann rearrangement of
cyclohexanone oxime to e-caprolactam. Catalysts with different vanadia loading (3–15 wt%) were
prepared by impregnation method and characterized by XRD, BET surface area, FTIR and 51V NMR
techniques. The surface acidic properties were determined by temperature programmed desorption and
cumene cracking reaction. Under optimized reaction conditions, catalyst with 9 wt% V2O5 gives the
maximum amount of desired product (yield 78.8%). However, the catalysts are susceptible for
deactivation due to the basic nature of the reaction products (50% deactivation in 5 h). A good correlation
was obtained among the rearrangement activities of V2O5/SnO2 catalysts, their weak plus medium
acidities (usually of the Bro¨ nsted type) and structural properties.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:tut/oai:encore.tut.ac.za:d1001694 |
| Date | 31 October 2008 |
| Creators | Pillai, SK, Gheevarghese, O, Sugunan, S |
| Publisher | Elsevier |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | |
| Rights | (C)2008 Elsevier B.V. |
| Relation | Applied Catalysis A: General |
Page generated in 0.0031 seconds