Effects of metal promoters in bimetallic catalysts in hydrogenolysis of lignin derivatives into value‐added chemicals

Abstract

Bimetallic catalysts have been widely employed in the lignin hydrogenolysis research, which is attributed to that the interaction between the two metals can regulate the catalyst surface properties, thus improving the catalytic performance. The metal promoters can change the adsorption strength and orientation between the catalyst surface and the substrates, the active sites dispersion and the catalyst stability, so the activity, selectivity and stability of bimetallic catalysts are better than those of the corresponding monometallic catalysts in lignin hydrogenolysis. The effects between the two metals can be divided into the following four types: the electronic (ligand) effect, synergistic effect, stabilizing effect and geometric (ensemble) effect. Herein, these four different effects between the two metals and the reaction mechanisms over different bimetallic catalysts in lignin hydrogenolysis are discussed in this minireview, aiming to point out the challenges and further perspectives in the design of efficient bimetallic catalysts.

More than a support: the unique role of Nb2O5 in supported metal catalysts for lignin hydrodeoxygenation

“…[9][10][11] Because of the complexity of the structure of lignin, model compounds are often used as reaction substrates to test highefficiency catalysts, and the catalysts are then applied to real lignin, which is beneficial to develop universal catalysts. 12 The hydrodesulfurization (HDS) catalysts applied to the petroleum upgrading process have been an inspiration in designing conventional HDO catalysts, such as sulfurized Ni-Mo and Co-Mo. 13,14 However, sulfur loss leads to rapid catalyst deactivation, and the addition of H 2 S (ref.…”

Integrated design of an amination process of lignin oxygenated model compounds to synthesize cyclohexylamine: catalyst nanostructure engineering and catalytic conditional strategy

“…Motivated by the superior performance of bimetallic catalysts in the study of lignin hydrogenolysis, 97 bimetallic or multimetallic catalysts should be reasonably designed to improve the catalytic amination efficiency. Here, the catalytic amination processes of CHONE and CHOL with bimetallic catalysts are reviewed, as shown in Table 3.…”

Hydrogenation/Hydrodeoxygenation Selectivity Modulation by Cometal Addition to Palladium on Carbon-Coated Supports

“…Bimetallic NP catalysts are a potential solution for the selective hydrogenation and hydrogenolysis of biobased molecules . Additionally, mesoporous carbon–metal oxide supports can be synthesized and PdFe bimetallic NPs can be immobilized on these supports .…”