Vanillin Formation by Electrooxidation of Lignin on Stainless Steel Anode: Kinetics and By-Products

Electro-oxidative depolymerisation of technical lignin in water using platinum, nickel oxide hydroxide and graphite electrodes

“…11 Among electrochemical approaches, the electro-oxidation of lignin at the anode is the most common one studied. 12 Even if electrocatalytic approaches similar to that adopted in the present study were reported in the literature for other combinations of lignins and working electrodes, [13][14][15] investigations regarding the electrochemical conversion of P1000 lignin, up to now, are absent. Only a few studies are available concerning its chemical valorisation through inorganic catalysts, such as CuMgAlO x or NiMo sulphide, in organic solvents under harsh reaction conditions.…”

“…This reaction condition agreed with the information reported in the literature for the electrooxidative depolymerisation of other technical lignins. 13,23,32 Considering the performances of Pt, NiOOH and graphite electrodes and the results obtained by the preliminary cyclic voltammetry study, the following reaction conditions were selected for the electrolysis of P1000 lignin: NiOOH electrode, pH 14, 0.4 V, 20 g L À1 lignin. NiOOH was selected as the most efficient electrocatalyst based on the highest net current density registered for the lignin oxidation peak in the cyclic voltammetry.…”

Greener Routes to Biomass Waste Valorization: Lignin Transformation Through Electrocatalysis for Renewable Chemicals and Fuels Production

“…Vanillin concentration was time dependent,r eaching am aximum value ands ubsequently getting degraded via second-order reactions. [120] In as eparate study,t hey investigatedt he formation of more than 25 valuable aromatic carbonyl and aromatic hydrocarbon compounds of thermochemically pretreated wheat straw soda lignin. Optimized current density (2.24 mA cm À2 ) and reaction time (12 h) favored the formation of 24.7 %a romatic carbonyl compounds (e.g.,6 .7 %v anillin and 11.4 %a cetosyringone), while ad ifferent optimized current density (2.24-2.28 mA cm À2 )w ith as horter reaction time (0-0.85h)w as optimal for the formation of 16.1 %a romatic hydrocarbons (12 % o-xylene and 3% toluene).…”

“…Vanillin formation was hypothesized to take place via a pseudo‐first‐order lignin degradation process, producing 6 % vanillin from wheat straw and 6.6 % vanillin from bagasse. Vanillin concentration was time dependent, reaching a maximum value and subsequently getting degraded via second‐order reactions . In a separate study, they investigated the formation of more than 25 valuable aromatic carbonyl and aromatic hydrocarbon compounds of thermochemically pretreated wheat straw soda lignin.…”

Valuable Compound Extraction, Anaerobic Digestion, and Composting: A Leading Biorefinery Approach for Agricultural Wastes

“…Nowadays, the major lignin use is as fuel, and only a few products like vanillin are produced (Singh and Ghatak, 2017). However, lignin is becoming a high interesting product.…”