Method for lignin aryl-ether bond catalytic pyrolysis with ReO<x>/AC

Abstract

The invention provides a new method for converting a lignin model compound dimer and a lignin raw material to a corresponding aromatic compound through a hydrogen transfer reaction by taking ReO<x> / AC as a catalyst. According to the method, one or two micromolecular alcohol is taken as a reaction regent, ReO<x> / AC is taken as a catalyst, and the lignin model compound and the lignin raw material are catalyzed and converted to a micromolecular aromatic chemical in a mild condition. Compared with a traditional lignin depolymerization method, the method has distinct features: no addition of hydrogen and oxygen sources, mild reaction conditions, high selectivity of monophenol products, fast reaction speed, recyclable catalyst, and simple operation. The aromatic chemicals can be prepared from renewable lignin sources, a mild depolymerization strategy without consuming hydrogen sources is developed, and a new approach is developed for producing an aromatic compound in a non-petroleum route.

Description

technical field [0001] The present invention provides a ReO x / AC is a catalyst, which converts lignin model compound dimers and lignin raw materials into corresponding aromatic compounds through hydrogen transfer reaction. Specifically, one or more of water and organic solvent alcohol is used as a solvent to effectively break the lignin aryl ether bond under the action of a catalyst by generating hydrogen itself. Background technique [0002] The massive consumption of fossil resources has led to the tightening of energy supply and the deterioration of the ecological environment. The transformation and utilization of biomass resources is one of the important ways to solve energy and environmental problems, which has attracted great attention from all over the world (Chem.Soc.Rev.2011,40,5588 ). Since the "Eleventh Five-Year Plan", my country's biomass energy utilization technology has made significant progress. Breakthroughs in key technologies such as microbial control ...

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Problems solved by technology

On the other hand, the hydrogenolysis process needs to consume a large amount of external hydrogen sources, which increases the cost to a certain extent

For the catalytic oxidative degradation of lignin, organometallic catalysts have high activity, similar to the hydrogenolysis process. In the oxidation reaction, due to the presence of various functional groups in lignin, the product selectivity is difficult to control, and it is prone to deep oxidation to destroy the C9 unit. Substituents and even benzene rings, the atom economy is reduced (J.Mol.Catal.A:Chem.1995,97,15); in addition, oxidative depolymerization also involves the consumption of external oxygen sources

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