Abstract
The hydroxylamine mechanism of cyclohexanone ammoximation on defective titanium active site of titanium silicalite-1 (TS-1) was simulated using two-layer ONIOM (M062X/6-31G**:PM6) method. A new energy favorable reaction route was found, which contained two parts: (1) the catalytic oxidation of adsorbed NH3 to form hydroxylamine using the Ti-OOH as an active oxidant formed by reacting H2O2 with the defective Ti active site; (2) the subsequent noncatalytic oximation of desorbed hydroxylamine and cyclohexanone out of TS-1 pores to form cyclohexanone oxime. In the catalytic formation of hydroxylamine on the Ti active site of TS-1, the proposed mechanism of two-step single-proton transfer aided by a lattice oxygen atom bonded to Ti atom need a lower reaction energy than the mechanism proposed before. In the subsequent noncatalytic oximation of hydroxylamine and cyclohexanone, which contained two elementary reaction steps in total, the mechanisms of one-step double-proton transfer in the first elementary reaction step and the subsequent one-step three-proton transfer for the second elementary reaction step were proposed, in which the solvent water molecules played a very important role in assisting and stabilizing the proton transfer processes.
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Grateful thanks for support of the National Natural Science Foundation of China (21276180) and the program for Changjiang Scholars and Innovative Research Team in University (IRT0936).
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Chu, C.Q., Zhao, H.T., Qi, Y.Y. et al. Density functional theory studies on hydroxylamine mechanism of cyclohexanone ammoximation on titanium silicalite-1 catalyst. J Mol Model 19, 2217–2224 (2013). https://doi.org/10.1007/s00894-013-1768-1
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DOI: https://doi.org/10.1007/s00894-013-1768-1