Method for catalyzing oxicracking of aryl ethers of lignin model

Abstract

The invention relates to a method for catalyzing oxicracking of aryl ethers of a lignin model. The method is characterized by comprising the step of catalyzing the oxicracking of the aryl ethers of the lignin model by taking two components, i.e., a simple inorganic oxovanadium compound and nitrate as a composite catalyst system and taking molecular oxygen as an oxygen supply. According to the method, the catalyst is simple, cheap and readily available, the reaction conditions are mild, the efficiency of oxicracking is high, and the aryl ethers in lignin can be efficiently cracked by a catalyzed oxidation method.

Description

technical field [0001] The invention relates to a method for effectively cracking lignin model aryl ether through catalytic oxidation. Specifically, a simple inorganic two-component composite catalyst is used as an oxygen source, and molecular oxygen is used as an oxygen source to efficiently catalyze the cracking of aryl ether in the oxidized lignin model under liquid phase and mild conditions. Background technique [0002] Biomass is abundant, widely sourced and renewable, and is a potential recyclable natural resource. Lignin is one of the three major components of plant biomass, and its content in plant biomass is about 15-30%. Because of its special structure and properties, lignin resources have great potential application value. Lignin is a rich source of natural and renewable bulk aromatic compounds. The development and utilization of lignin resources is of great significance for the preparation of high value-added aromatic compounds. Lignin itself is a highly cros...

AI Technical Summary

Problems solved by technology

There have been a lot of reports on the cracking of aryl ethers through hydrocracking, photodegradation or electrochemical degradation, but there are very few reports on their oxidative cracking reactions.

Larsen et al reported the use of Fe(III) complexes as a catalyst, air as an oxygen source, and the method of reflux in acetonitrile under normal pressure to oxidize benzyl phenyl ether; the conversion rate of raw material benzyl phenyl ether in this oxidation system is as high as 90 % or more, but the solvent acetonitrile in the system is oxidized at the same time, and by-products such as benzene epoxidation products phenols are produced in large quantities, and the selectivity of oxidative bond breaking is poor

Yan Ning et al. reported a nitrogen-containing graphene material (LCN) as a catalyst, tert-butyl hydroperoxide (TBHP) as an oxidant, and a water-phase oxidative cracking method of benzyl phenyl ether, reacting at 80 ° C for 24 h, benzyl The conversion rate of phenyl ether is 68%; but the preparation of oxidant used in the reaction is complicated and the consumption is large

[0004] It can be seen from previous studies that the oxidative cracking of aryl ethers is still in the exploratory stage, and it is of great research significance to develop a catalytic oxidation system with high efficiency and high bond-breaking selectivity.

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