MnAPO-5 as an efficient heterogeneous catalyst for selective liquid phase partial oxidation reactions

Abstract

Heterogeneous catalysts play a key role in addressing the economic and environmental issues of the chemical industry due to their several advantages, like ease of product separation, work-up and high recycling efficiency. Herein, we report the synthesis of a robust manganese(iv)-containing aluminophosphate material (MnAPO-5), with an AFI framework topology. This material has been characterized thoroughly by powder XRD, XPS, UHR TEM, FE SEM, P CP MAS NMR, atomic absorption spectroscopy, UV-visible spectroscopy and TGA. The Mn-containing microporous material has been employed as a heterogeneous catalyst for the oxidation of styrene and the synthesis of adipic acid from cyclohexanone in the presence of tert-butyl hydroperoxide (TBHP) as the oxidant in air and it displayed very high recycling efficiency.

Recent Progress in Adipic Acid Synthesis Over Heterogeneous Catalysts

“…This material showed a 92% cyclohexanone conversion and 66% selectivity to AA. A Mn incorporating aluminophosphate material (MnAPO-5) was synthesized by Chatterjee's group (Chatterjee et al, 2018). A complete conversion of cyclohexanone and AA selectivity were obtained (Table 2, #15).…”

“…Cyclohexane, cyclohexanol, cyclohexanone can be oxidized to produce AA without formation of any greenhouse gases (Sato et al, 1998;Chatterjee et al, 2018;Luo et al, 2018;Mazzi et al, 2018;Mouheb et al, 2018;Wang et al, 2018). Oxygen, air, hydrogen peroxide (H 2 O 2 ) are regarded as clean oxidant since they give water as the only byproduct.…”

Metal-Substituted Microporous Aluminophosphates

“…multifunctional MeAPO-5 catalyst containing a redox and non-redox metal ions for one-step conversion from cyclohexanone to caprolactam [163], liquid phase oxidation of styrene and synthesis of adipic acid from cyclohexanone using MnAPO-5 in presence of tert-butyl hydroperoxide [164], phenol hydroxylation over iron containing AlPO4-5 prepared by hydrothermal methods, ion-exchange and impregnation methods for phenol hydroxylation and ethane oxydehydrogenation over MnAPO-5 [165].…”

Towards a sustainable tomorrow: advancing green practices in organic chemistry

“…54 Embracing the principles of green chemistry, significant strides have been achieved, notably through the direct oxidation of cyclohexane, cyclohexanol, and cyclic hexanone to adipic acid using environmentally benign oxidants such as oxygen and hydrogen peroxide with water as a byproduct. 55,56 Various recyclable and cost-effective catalysts, including metal oxides, carbon nanotubes, and polyoxometalates, have been explored. 57,58 Particularly noteworthy is a synthetic pathway that leverages renewable feedstocks like glucose in combination with biocatalysts, offering a highly sustainable approach.…”