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- Catalytic wet air oxidation of aniline on transition metal modified MCM-41 catalystsPublication . Gomes, Helder; Selvam, Parasuraman; Dapurkar, Sudhir; Figueiredo, José; Faria, JoaquimTransition metal (Cu, Cr and V) MCM-41 catalysts were prepared hydrothermally and characterized by X-ray diffraction (XRD), scanning electron microscopy/energy dispersive X-ray (SEM/EDX), inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and N2 adsorption-desorption analysis at -196ºC. The catalysts were tested in the catalytic wet air oxidation (CWAO) of aniline aqueous solutions at 200ºC and 6.9 bar of oxygen partial pressure. The (Cu)MCM-41 catalyst showed the best performance with respect to combined activity and selectivity for aniline conversion to nonorganic compounds. After 2 h of reaction, 96% aniline conversion and 76% of selectivity were attained. Under the employed reaction conditions, leaching of copper was detected in small extent. However, heterogeneous catalytic activity was proved and attributed to copper oxide anchored to MCM-41.
- Transition metal (Cu, Cr, and V) modified MCM-41 for the catalytic wet air oxidation of anilinePublication . Gomes, Helder; Selvam, Parasuraman; Dapurkar, Sudhir; Figueiredo, José; Faria, JoaquimMesoporous MCM-41 based materials containing various transition metals (Cr, Cu and V) were prepared hydrothermally and characterized using various analytical and spectroscopic techniques. Cr and Cu are randomly anchored to the surface of MCM-41 support, while V is predominantly present as penta-valent species within the framework structure of the support. The catalytic activity was tested in the wet air oxidation of aniline aqueous solutions (2 g/L) using a high-pressure reactor at 200 C with an oxygen partial pressure of 6.9 bar. Among the prepared materials, (Cu)MCM-41 showed a significant catalytic activity with an aniline conversion after 2 h of 96% and a selectivity towards CO2 formation of 76%. Although some leaching of the Cu was observed, the catalyst showed a good performance and stability after re-use in at least three consecutive cycles.