| Titre : | Catalytic activity of clay-based titanium silicalite-1 composite in cyclohexanone ammoximation (2010) |
| Auteurs : | Alex C. K. Yip, Auteur ; Xijun Hu, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 48 N° 18, Septembre 2009) |
| Article en page(s) : | pp. 8441–8450 |
| Note générale : | Chemical engineering |
| Langues : | Anglais |
| Tags : | Cyclohexanone ammoximation Catalyst External diffusion Internal |
| Résumé : | Following the recent report on the synthesis of a clay-based titanium silicalite-1 (TS-1) composite, this work provided important information on the catalytic activity of the catalyst developed for cyclohexanone ammoximation. Experimental works showed that the optimum molar ratio of cyclohexanone:H2O2:NH3 was 1:1.6:2.5. It was found that the cyclohexanone ammoximation over the clay-based catalytic composite gave the highest oxime yield when H2O2 and NH3 was continuously added and was evenly distributed in 5 doses, respectively, to the reaction mixture. The external and internal diffusions can be eliminated by using a water:t-butanol mixture as a solvent, with sufficiently fast agitation speed and having TS-1 crystal with size smaller than 500 nm. On the basis of the adsorption studies and the spectroscopic evidence, the mechanism of the cyclohexanone ammoximation over the catalyst developed are suggested to follow Langmuir−Hinshelwood and Eley−Rideal kinetics. The data acquired in this study is particularly essential for industrial reactor design. |
| En ligne : | http://pubs.acs.org/doi/abs/10.1021/ie900731s |
