The Promotor and Poison Effects of the Inorganic Elements of Kraft Lignin during Hydrotreatment over NiMoS Catalyst

One-pot deoxygenation of kraft lignin to aromatics and hydrocarbons fuel-range quality is a promising way improve its added value. Since most the commercially resourced lignins are impure (Na, S, K, Ca, etc., present as impurities), effect these impurities on activity catalyst critical was scrutinized in this study using NiMoS/Al2O3 catalyst. The removal from indicated that they obstructed depolymerization. In addition, deposited during depolymerization, which major element alkali metal Na existed Na2S single-site ionic Na+. Conditional experiments have shown at lower loadings catalyst, their promotor prevalent, higher loadings, poisoning effect. number moles impurities, strength, synergism among impurity elements were factors responsible for catalyst’s deactivation. effects however, could counteract negative