微拟球藻热解及其催化热解制备生物油研究

Production of bio-oil by direct and catalytic pyrolysis of Nannochloropsis sp.

在氮气气氛下对微拟球藻直接热解及其在H-ZSM-5上的催化热解实验进行了研究。在573 K～773 K考察了热解温度对热解油产物分布的影响。与木质纤维素生物质的热解相比,微拟球藻的热解不仅温度更低,而且油的收率更高。催化剂H-ZSM-5在热解中起到了脱极性官能团和芳构化的作用,使得热解油中的芳香族化合物含量增多,极性化合物含量减少。与木质纤维素生物质相比,微拟球藻热解获得的油热值更高,适合进一步加工为燃油。

Nannochloropsis sp.was pyrolyzed directly or with H-ZSM-5 as catalyst under nitrogen atmosphere to produce bio-oil.The influence of pyrolysis temperature on the product distribution in the pyrolytic oil was investigated within the range of 573 K ～ 773 K.Compared with the pyrolysis of lignocellulosic biomass,the pyrolysis of Nannochloropsis sp.can be performed at relatively lower temperature and with higher oil yield.H-ZSM-5 is effective for the removal of various polar functional groups as well as for the aromatization;and the bio-oil obtained with H-ZSM-5 catalyst contains more aromatic compounds and fewer polar species than that from direct pyrolysis.The heating values of the bio-oil from Nannochloropsis sp.is higher than that from lignocellulosic biomass,and thus the former is more suitable to be upgraded to practical fuel.