Alkaline wet oxidation of lignin over Cu-Mn mixed oxide catalysts for production of vanillin

Study on the Performance of Copper‐Manganese Composite Oxide Catalysts for Toluene

“…In order to confirm the interaction between copper and manganese oxides, the H 2 -TPR test was performed as Figure 7. Compared with CuO x and MnO X , [34][35][36] the reduction peaks of the fresh catalyst and used catalyst all moved to the low temperature, indicating that the interaction between the composite oxides had occurred, which promoted the reduction ability of the catalyst. The fresh catalyst showed two characteristic peaks at 169°C and 225°C, which were attributed to the CuOÀ Cu 2 OÀ Cu reduction process in the catalyst.…”

Spinel-based catalysts for the biomass valorisation of platform moleculesviaoxidative and reductive transformations

“…Furthermore, a similar catalyst was used for the wet alkaline oxidation of lignin to produce various aromatic oxygenates. 135 The oxidation ability and redox properties of catalysts varied by changing the Cu/Mn ratio. The formation of the spinel led to an increase in the redox ability and mobility (due to the presence of a high concentration of surface oxygen vacancies, defective oxygen species, and grain boundary), resulting in higher activity (Fig.…”

Degradation mechanism of a lignin model compound during alkaline aerobic oxidation: formation of the vanillin precursor from the β-O-4 middle unit of softwood lignin

“…Among the many methods currently suggested, [3][4][5][6][7][8][9][10][11] alkaline aerobic oxidation is a promising way from the viewpoint that lignin is effectively degraded by non-toxic molecular oxygen. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] Alkaline aerobic oxidation has been put into industrial application as a vanillin (4-hydroxy-3methoxybenzaldehyde) production method from lignosulfonate, a component of waste liquor from sulfite pulping. Vanillin is one of the platform chemicals in industry, which is used not only as a traditional fragrance but also as a raw material for medicines and polymer materials.…”

“…27 Another issue is the handling of waste liquid containing sulfur that originated from the sulfo groups in the raw material. To fix these problems, many efforts have been made, including development of more efficient catalysts and additives to improve vanillin yields, 15,19,21,22,33,34 designing new reactors from the viewpoint of chemical engineering, [21][22][23]35 and use of raw materials more versatile than lignosulfonate, i.e. kraft lignin and native lignin in softwood.…”