Products Cited in Publications Worldwide Catalytic Selective Oxidation of β-O-4 Bond in Phenethoxybenzene as a Lignin Model Using (TBA)5[PMo10V2O40] Nanocatalyst: Optimization of Operational Conditions

Catalytic Selective Oxidation of β-O-4 Bond in Phenethoxybenzene as a Lignin Model Using (TBA)5[PMo10V2O40] Nanocatalyst: Optimization of Operational Conditions

Diaz, Juan; Pizzio, Luis R.; Pecchi, Gina; Campos, Cristian H.; Azocar, Laura; Briones, Rodrigo; Romero, Romina; Troncoso, Eduardo; Mendez-Rivas, Camila; Melin, Victoria; Murillo-Sierra, Juan C.; Contreras, David

DOI: PMID:

Abstract

The catalytic oxidation of phenethoxybenzene as a lignin model compound with a β-O-4 bond was conducted using the Keggin-type polyoxometalate nanocatalyst (TBA)5[PMo10V2O40]. The optimization of the process′s operational conditions was carried out using response surface methodol. The statistically significant variables in the process were determined using a fractional factorial design. Based on this selection, a central circumscribed composite exptl. design was used to maximize the phenethoxybenzene conversion, varying temperature, reaction time, and catalyst load. The optimal conditions that maximized the phenethoxybenzene conversion were 137 °C, 3.5 h, and 200 mg of catalyst. In addition, under the optimized conditions, the Kraft lignin catalytic depolymerization was carried out to validate the effectiveness of the process. The depolymerization degree was assessed by gel permeation chromatog. from which a significant decrease in the molar mass distribution Mw from 7.34 kDa to 1.97 kDa and a reduction in the polydispersity index PDI from 6 to 3 were observed Furthermore, the successful cleavage of the β-O-4 bond in the Kraft lignin was verified by gas chromatog.-mass spectrometry anal. of the reaction products. These results offer a sustainable alternative to efficiently converting lignin into valuable products.

Keywords

polyoxometalate nanocatalyst ; Keggin-type ; lignin model compound ; beta-O-4 bond ; heterogeneous catalysis ; green chemistry

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A35545340515-89-797%

Phenethoxybenzene

115.0/25g

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