Structural properties and catalytic oxidation of benzene to phenol over CuO-impregnated mesoporous silica

Tailoring the metal introduction sequence onto mesostructured silica nanoparticles framework: Effect on physicochemical properties and photoactivity

“…Moreover, the band at 966 cm −1 also decreased in intensity with metal loading, indicating that replacement of the OH group by O metal ions probably occurred. A similar phenomenon was reported in the literature when CuO was impregnated onto mesoporous silica [32]. In order to study the effect of the metal introduction sequence on the MSN framework, a Gaussian curve-fitting was plotted for the two bands at 1084 and 966 cm −1 for both 3C-ZM and Z-3CM and compared with bare MSN.…”

Preparation of Copper Oxide with High Surface Area Associated with Mesoporous Silica

“…MCM-41 and SBA-15, are expected to provide a high metal dispersion and excellent catalytic activities as evidenced in many heterogeneous oxidation reactions such as the oxidation of phenol, benzene, trimethylphenol, and alcohol [21,22]. Introduction of copper oxide into mesoporous silica can be made through the one-pot synthesis method [23][24][25][26][27] or the post-impregnation method [28][29][30][31]. Kong et al [23] reported that the direct-synthesized CuO/mesoporous silica with high loading shows better catalytic activity for the hydroxylation of benzene to phenol than the post-impregnated catalyst.…”

Liquid phase hydroxylation of benzene to phenol over Cu/ZnO catalysts

“…The catalyst had similar copper contents; thus, the high activity of the catalysts used in this study is likely to be due to both the support effect and the high copper surface areas achieved by the polyol reduction method, even though much higher leaching occurred during runs. The hydroxylation of benzene to phenol with H 2 O 2 was also studied over Cu/MCM-41 in acetic acid as reported by Parida and Rath [10]. Higher phenol yields (selectivity 94%, conversion 21%) were also reported for 4Cu/MCM-41.…”

“…This was an outstanding problem for all copper containing catalysts. For instance, the reusability Liquid phase hydroxylation of benzene to phenol 203 experiment of the direct-synthesized mesoporous CuO/SBA-15 showed poor catalytic activity (1.0% phenol yield) in the second run, though 17 wt% CuO loading content remained [10]. Another interesting finding was the state of copper species in the reaction medium.…”