Microwave-Assisted Catalytic Cleavage of C-C Bond in Lignin Models by Bifunctional Pt/CDC-SiC

摘要

We herein reported a microwave-assisted catalytic cracking (MACC) strategy for 5-5' C(phenyl)-C(phenyl) bonds cleavage using 2,2'-biphenol (2-BP) as the kraft lignin model. A microwave absorbent of SiC was modified as the catalyst carrier for the carbide-derived carbon (CDC) layer to form CDC-SiC; subsequently, the Pt/CDC-SiC catalyst was prepared. Pt/CDC-SiC exhibited a high selectivity to monomers with total mass yields of 49.3 wt %. The conversion rate increased from 17.1% to 85% with Pt/CDC-SiC under the dynamic vapor flow reaction system. Methanol vapor can produce hydrogen and methyl radicals under microwave irradiation and decrease the activation barrier of the C-C bond cleavage.