Effect of aqueous phase bio-oil and its typical organic matter washing pretreatment on catalytic pyrolysis characteristics of biomass

In this work, APBO and its typical organic matter (HAc, Phenol, Guaiacol) were used to pretreat wheat straw separately, and CFP characteristics of wheat straw before and after the pretreatment were investigated. Washing with four different solutions removed more than 95% of K(+ )and over 86% removal of Na+; the removal effect of APBO on Ca2+ and Mg2+ is more evident with more than 84%. Washing reduced AAEMs, thereby reducing acids and ketones and increasing sugars in the bio-oil. TGA demonstrated that different washing significantly increased wheat straw's maximum weight loss rate and overall weight loss rate. After the subsequent addition of HZSM-5 catalyzed pyrolysis, the level of oxygen-containing compounds in bio-oil was significantly reduced and the aromatic hydrocarbon level increased from 2.19% (R) to 14.89% (CR), 31.28% (APBO-CR), 25.9% (HAc-CR), 24.74% (Phenol-CR), 15.81% (Guaiacol-CR), and the highest selectivity was 54.57% for BTX (APBO-CR). The combined APBO washing and HZSM-5 is a potential technology for upgrading biomass and the liquid products of pyrolysis because it can effectively raise bio-oil quality.