Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO₂–MnO_x composite oxides

Abstract

An efficient method for highly selective preparation of the high value-added benzyl alcohol (BOL) and benzaldehyde (BAL) from liquid-phase catalytic oxidation of toluene with molecular oxygen over CeO2-MnOx composite oxides...

Selective liquid‐phase oxidation of toluene with molecular oxygen catalyzed by Mn‐TiO2 under solvent‐free conditions

“…The characteristic peaks at 642.1 and 640.7 eV are ascribed to the existence of Mn 3+ and Mn 2+ , respectively. [1] The result of Mn 2p XPS spectra further accurately reveals the oxidation state of Mn species, and this finding is consistent with the result of XRD.…”

“…[ 15 ] In Chen's group, they demonstrated a CeO 2 ‐MnO x solvent‐free catalytic system with oxygen as an oxidant, and the conversion of toluene and the selectivity to BOL and BAL were 6.9% and 64.4%, respectively. [ 1 ] It is easily seen that Mn‐ and Co‐based catalysts are mostly used as metal‐based catalysts for the catalytic oxidation of toluene. Reddy et al and Xia et al reported MnO x /γ‐Al 2 O 3 catalyst and Mn/g‐C 3 N 4 /ZSM‐4 to apply for the total oxidation of toluene.…”

“…The selective oxidation of toluene is a significant reaction in organic synthesis, since the resulting benzyl alcohol (BOL), benzaldehyde (BAL), and benzoic acid (BAC) are important intermediates in fine chemical synthesis fields. [1][2][3] In the oxidation of toluene, BAC can be easily obtained by further oxidation from BOL and BAL. Despite this, BAC is not a high-value product compared with BOL and BAL.…”

Manganese oxide-based catalysts for the sustainable synthesis of value-added chemicals through oxidation processes: a critical review and perspectives for the future

“…Chen et al 95 demonstrated that CeO 2 –MnO x composite oxides displayed good selectivity towards benzyl alcohol and benzyl aldehyde (Fig. 8d).…”

Highly efficient selective oxidation of toluene to benzaldehyde over Cu–V oxides supported on amorphous SiO2

“…At present, as an economical and environmental oxidant, O 2 is used for the oxidation of toluene. 8–11 But its reaction conditions are harsh (usually high temperature and pressure), and the conversion rate of toluene is low, so oxidation of toluene remains a challenge with mild conditions. Although noble metals have higher efficiency for toluene oxidation, such as Pt, 12 Pd, 13 and Au, 14 large-scale applications are limited due to the high cost and scarcity of these catalysts.…”