关键词: 木质素, 催化热解, 分子筛, 金属氧化物, 金属盐

Abstract:

Lignin is a kind of biomass resource with complex structure and abundant yield, but it has low utilization rate. It can be depolymerized into high value-added products through catalytic pyrolysis and has broad application prospects. This paper introduces the research methods of catalyst mechanism and the mode of action of catalysts, and compares the catalytic performance, product yield, product distribution, catalytic mechanism and advantages of molecular sieve catalysts, metal oxide catalysts and metal salt catalysts commonly used in catalyzing the pyrolysis of lignin. Molecular sieve catalysts have strong deoxygenation ability and high acidity, but low liquid product yield; metal oxide catalysts have the advantages of high liquid product yield and strong thermal stability, but they rely on the adjustment of catalyst acidity and alkalinity; although metal salt catalysts are highly efficient and inexpensive, they have poor thermal stability and are easy to inactivate. At the same time, this article puts forward a prospect of lignin catalytic pyrolysis. The research on pyrolysis catalysts in the future needs to be in-depth and systematized. According to the types of lignin and target products, the design of composite catalysts, core-shell catalysts and multi-catalyst cooperative catalysis is the development trend of pyrolysis catalyst.

Key words: lignin, catalytic pyrolysis, zeolite, metallic oxide, metal salt