Using Mn(II)−MCM41 as an Environment-Friendly Catalyst to Oxidize Phenol, 2-Chlorophenol, and 2-Nitrophenol in Aqueous Solution
Mesoporous MCM41 modified by incorporation of Mn(II) was used as a catalyst for oxidation of phenol, 2-chlorophenol, and 2-nitrophenol in water with H2O2. Mn(II)−MCM41, obtained by both direct synthesis and impregnation, was characterized by XRD, SEM, and FTIR measurements. The cation exchange capacities of calcined MCM41 and synthesized and impregnated Mn(II)−MCM41 were 0.20, 0.21, and 0.26 mequiv g-1. The materials were calcined at 773−823 K for 6−24 h before using as catalysts in a high pressure stirred reactor at 0.2 MPa and 353 K under various reaction conditions. Oxidation of phenol, 2-chlorophenol, and 2-nitrophenol in 5 h was 86.5, 90.3, and 74.3% with the synthesized Mn(II)−MCM41 and 88.9, 90.3, and 87.6% with the impregnated Mn(II)−MCM41, respectively. The reaction followed pseudo-first-order kinetics with respect to phenol, 2-chlorophenol, or 2-nitrophenol, and the apparent kinetic constant was from 4.1 × 10-3to 7.6 × 10-3L (g of catal)-1min-1. The results have been discussed with respect to the effects of various reaction conditions. [ABSTRACT FROM AUTHOR] Copyright of Industrial & Engineering Chemistry Research is the property of American Chemical Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts)