Effect of Cobalt(II) on Acid-Modified Attapulgite-Supported Catalysts on the Depolymerization of Alkali Lignin

Abstract

With an aromatic structure, lignin has great potential for the production of high value-added chemicals. In this study, Co/m-ATP catalyst was prepared by the co-impregnation method to depolymerize lignin with inexpensive attapulgite as a carrier, 1,4-dioxane as a solvent, and ethanol as an in situ hydrogen source. Meanwhile, formaldehyde stabilization facilitates lignin monomer production during biomass depolymerization. The effects of Co particle loading and reaction conditions (e.g., temperature and reaction time) on lignin conversion and product yield were investigated, resulting in a low char yield (6.6 wt %) and high bio-oil yield (63.1 wt %) when alkali lignin was depolymerized over the Co/m-ATP catalyst (cobalt loading of 15 wt %) at 220 °C for 8 h. Therefore, this catalyst with the advantage of low cost and high catalytic activity would be a potential catalyst during the depolymerization of lignin.

Polysaccharides from Russula: a review on extraction, purification, and bioactivities

“…Ucinet software and Netdraw software are used to generate the visual collinear network diagram of author, author and keyword. The research published over the past 20 years has indicated that Russula possesses good anti-oxidant ( 11 , 12 ), anti-tumor ( 13 , 14 ), immune-related ( 15 , 16 ), anti-inflammatory ( 6 , 17 ), and anti-bacterial ( 6 , 14 ) activities ( Figure 2B ). The bioactive properties of the polysaccharides from Russula are intricately associated with their physicochemical and structural characteristics, such as the composition of monosaccharides, type of glycosidic bonds, and functional groups of the primary structure, much like lentinan.…”

Lignin Catalytic Depolymerization for Guaiacols and Alkylphenols over Co–Zr/Sepiolite under Supercritical Ethanol

“…However, it had been found that the produced highly reactive intermediates during the LCD process underwent an irreversible condensation reaction and formed abundant coke, which restricts the advancement of LCD technology. , It has been demonstrated that LCD under a special solvent system and a reducing atmosphere could inhibit coke and increase the HHV (higher heating value) of liquid products and the selectivities of different monomers. − Li et al − developed an advanced solvent system consisting of methanol and 1,4-dioxane coupled with hydrogen pressures (2–4 MPa) to achieve the lignin depolymerization into liquid fuels and significantly inhibit the coke formation. Shu et al proposed a solvent system of metal chloride cooperated with methanol to achieve lignin depolymerization with controllable product distribution under a hydrogen pressure of 4 MPa.…”

Oxidative cleavage of lignin model substrates with Co(salen) catalyst: an experimental study on the effect of different reaction parameters in batch and continuous flow

“…1) Most literature research dedicated to lignin depolymerization, aims to effectively cleave these ether bonds yielding various aromatic compounds. [2][3][4][5][6] These compounds can then undergo hydrodeoxygenation to obtain a highquality bio-oil. 7 Although β-O-4 ether bonds account for the majority of the interunit linkages in native lignin, biorefining of biomass results in many of these β-O-4 ether bonds being broken.…”

“…1) Most literature research dedicated to lignin depolymerization, aims to effectively cleave these ether bonds yielding various aromatic compounds. 2–6 These compounds can then undergo hydrodeoxygenation to obtain a high-quality bio-oil. 7…”