Performance of cobalt titanate towards H₂O₂ based catalytic oxidation of lignin model compound

Abstract

Mixed metal cobalt titanium oxide (CoTiO3) prepared by solution phase method has been evaluated for the liquid phase catalytic oxidation of vanillyl alcohol to vanillin using H2O2 as an oxygen source.

Synthesis, characterisation and water–gas shift activity of nano-particulate mixed-metal (Al, Ti) cobalt oxides

“…In contrast to the Raman spectrum of the calcined cobalt aluminate sample, the synthesised and calcined cobalt titanate matches with published spectra for CoTiO3 33,[43][44][45] with major peaks at 240, 270, 339, 388, 617, and 687 cm -1 (Figure 2). However, once again the Raman spectra in the literature are contradictory.…”

“…In particular the peaks at 481 and 521 cm -1 are inconsistently identified for CoTiO3 samples in previously published work. 33,43 Mixed-metal cobalt oxides not only exhibit an increased thermal stability when compared to cobalt oxide, but also are more difficult to reduce in H2-containing atmospheres. 46 TPR is a commonly applied characterisation technique for such hardto-reduce species and has been applied for the calcined mixed-metal cobalt oxide samples.…”

Catalytic Oxidation of Lignin in Solvent Systems for Production of Renewable Chemicals: A Review

“…Deng et al [ 74 ] proposed that methanol as a solvent in oxidative solvolysis of lignin model compounds, which could afford active H species for the hydrogenolysis of the β-O-4 bond, producing phenol and acetophenone. Similarly, Shilpy et al [ 92 ] investigated the influence of the property of the solvent on the oxidative solvolysis of vanillyl alcohol and vanillin. The highest conversion rate was observed in acetic acid (91%), followed by ethyl alcohol (70%), acetonitrile (67%), N , N -dimethyl formaldehyde (35%), tetrahydrofuran (20%) and acetone (1%).…”

CuZrO3nanoparticles catalyst in aerobic oxidation of vanillyl alcohol

“…Vanillyl alcohol is oen considered to be one of the model compounds representing lignin since its structure is similar to one of the building block units of lignin. [9][10][11][12][13] Selective oxidative products of vanillyl alcohol are important platform chemicals in pharmaceutical and perfume industries and it is also used as a food grade avor. 14,15 Ma et al summarized the homogeneous catalysts investigated for lignin valorization.…”

“…Mariom et al reported CoTiO 3 catalyst using H 2 O 2 resulted in catalytic activity of 66% with a 6 h reaction time. 9 Recently, Balachandra et al reported preparation of nano Fe 3 O 4 @APTES@Ni (OH) 2 catalyst with 73% conversion in a 8 h reaction time. 21 Also, another group of researchers reported a carbon supported iron oxide catalyst with 86% selectivity for vanillyl alcohol oxidation.…”