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<p>The commercial production of benzaldehyde through the toluene chlorination and hydrolysis method not only releases chloride-laden effluents into the environment but also excludes its application into the field of food and medicine due to the residual chlorine. To develop a green process that produces chlorine-free product efficiently and cheaply, a keggin-type polyoxometalate designed with Co as a heteroatom, Mo, W and Mn as ligand atoms and La as a counter cation has been loaded on activated carbon to catalyze the production of benzaldehyde from the oxidation of toluene in liquid-phase by oxygen. The optimum catalyst preparation conditions are as follows: polyoxometalate loading 35%(wt), pH<sub>1</sub> = 7.1, pH<sub>2</sub> = 3.8, T<sub>1</sub> = T<sub>2</sub> = 85&#xa0;°C and activated in N<sub>2</sub> at 220 ℃ for 4&#xa0;h. Characterization has been done with ICP-OES, FT-IR, XRD and TG. The polyoxometalate synthesized is proved to be Keggin-type structure. The catalyst Na<sub>4.2</sub>LaCoMn<sub>0.3</sub>W<sub>1.5</sub>Mo<sub>10.2</sub>O<sub>40</sub>·18.53H<sub>2</sub>O@AC manifests the best performance in catalyzing the production of benzaldehyde from the partial oxidation of toluene with a toluene conversion of 18.55%, benzaldehyde selectivity of 33.61% and benzaldehyde yield of 6.23%.</p>

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Partial oxidation of toluene to benzaldehyde catalyzed by heteropoly compounds immobilized on activated carbon

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Yu-cheng Jiang,
  • Jun-qi Hai,
  • Di Zhu,
  • Xiang-li Long

摘要

The commercial production of benzaldehyde through the toluene chlorination and hydrolysis method not only releases chloride-laden effluents into the environment but also excludes its application into the field of food and medicine due to the residual chlorine. To develop a green process that produces chlorine-free product efficiently and cheaply, a keggin-type polyoxometalate designed with Co as a heteroatom, Mo, W and Mn as ligand atoms and La as a counter cation has been loaded on activated carbon to catalyze the production of benzaldehyde from the oxidation of toluene in liquid-phase by oxygen. The optimum catalyst preparation conditions are as follows: polyoxometalate loading 35%(wt), pH1 = 7.1, pH2 = 3.8, T1 = T2 = 85 °C and activated in N2 at 220 ℃ for 4 h. Characterization has been done with ICP-OES, FT-IR, XRD and TG. The polyoxometalate synthesized is proved to be Keggin-type structure. The catalyst Na4.2LaCoMn0.3W1.5Mo10.2O40·18.53H2O@AC manifests the best performance in catalyzing the production of benzaldehyde from the partial oxidation of toluene with a toluene conversion of 18.55%, benzaldehyde selectivity of 33.61% and benzaldehyde yield of 6.23%.