Advances in HZSM-5 catalyzed pyrolysis of lignin to aromatic hydrocarbons
Aromatic hydrocarbons(AHCs)are important raw materials of organic chemicals and blending components of gasoline,which are traditionally derived from petroleum route.Obtaining AHCs from renewable biomass resources is demanded due to the growing consumption of petroleum.Lignin,one of the components of biomass with rich aromatics,is a potential raw material for the production of AHCs.Efficient transformation of lignin to AHCs by catalyzed pyrolysis over HZSM-5 molecular sieve has attracted increasing attention,although this process faces low selectivity of target products,easy coke deposition on HZSM-5,and so on.The influences of HZSM-5 physicochemical properties and reaction conditions on the distribution of aromatic products were analyzed.Regulating the acidity,porosity,and mass transfer/diffusion of the catalysts,by metal addition,desilication,combining mesoporous catalysts,and assisted catalysis,enhanced the distribution of mono-aromatic hydrocarbons in bio-oils and the catalytic stability.Future development directions for this catalytic pyrolysis transformation were proposed including rational selection of the HZSM-5 modification strategy according to the target aromatic products,in-depth understanding of the catalysis and the carbon-accumulation mechanism.
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