Comparison of the effects of nitrogen poisoning on molybdenum oxycarbide and Pt/{beta}-zeolite catalysts in the isomerization of n-heptane
- Univ. Louis Pasteur, Strasbourg (France)
The effect of nitrogen-containing compounds was studied over MoO{sub 3}-carbon-modified and Pt-(1.5 wt %)/{beta}-zeolite catalysts using n-heptane isomerization as the test reaction and piperidine and pyridine as the poisoning molecules. n-Heptane isomerization performed over both catalysts under pure feed showed no deactivation as a function of time on stream. At a pressure of 6 bar the MoO{sub 3}-carbon-modified catalyst exhibited a high resistance to deactivation up to 10 ppm of nitrogen, while the Pt-based catalyst was strongly deactivated down to 30% of its initial activity after 20 h. At higher concentrations of nitrogen ({ge}40 wt ppm) deactivation occurred over both catalysts as a function of time. Results obtained after different regeneration regimes on the MoO{sub 3}-carbon-modified deactivated catalyst led to the conclusion that the deactivation observed was essentially due to coke formation. Finally, increasing the total pressure allowed a better resistance to deactivation by hydrogenating the coke residues over the MoO{sub 3}-carbon-modified catalyst.
- OSTI ID:
- 413426
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 10 Vol. 35; ISSN IECRED; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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