Catalytic hydropyrolysis (HP) of crop straw and used engine oil (UEO) alone and co-HP of crop straw and UEO were conducted. Crop straws with higher cellulose contents and cellulose-to-hemicellulose mass ratios produced higher oil yield in the HP process. Positive synergistic effect between crop straw and UEO was observed for improving the pyrolysis oil yield and reducing coke formation and N and S content during their co-HP process. Compared with the oils produced from the HP of crop straw alone, the oils obtained from the co-HP of crop straw and UEO possessed higher H content, HHVs, and effective hydrogen (H/C_eff) value, and significantly lower N and S contents (12−887 mg L⁻¹ and 16−112 mg L⁻¹, respectively). Strong synergistic effect between crop straw and UEO for the removal of S rather than N was observed during co-HP. Co-HP was found to slightly increase the abundances of lighter compounds in the oils compared with that of HP of crop straw alone. Co-HP of crop straw and UEO also resulted in a clearly higher energy recovery (73.26–83.45 %) than the HP of crop straw alone (30.95–67.95 %). The pyrolysis oil produced from the co-HP process was divided into centrifugal oil (C-oil) and extraction oil (E-oil), and the C-oils had much lower N and S contents (12−57 mg L⁻¹ and 16−24 mg L⁻¹, respectively) than the E-oils (445−887 mg L⁻¹ and 71−112 mg L⁻¹, respectively). Moreover, the C-oils also exhibited slightly higher saturated hydrocarbons content and lower aromatic compounds content than the E-oils.

分别进行了农作物秸秆和废机油的催化加氢热解（HP）以及农作物秸秆和UEO的共-HP。纤维素含量高且纤维素与半纤维素的质量比更高的农作物秸秆在高压工艺中产生了更高的产油量。观察到农作物秸秆与UEO之间的积极协同作用可提高热解油的产量，并减少其共HP过程中焦炭的形成以及N和S的含量。与仅由农作物秸秆的HP产生的油相比，由农作物秸秆和UEO的共HP所得的油具有较高的H含量，HHV和有效氢（H / C _eff）值，并且N和S显着降低含量（12-887 mg L ^-1和16-112 mg L ^-1， 分别）。在共-HP过程中，观察到农作物秸秆和UEO之间具有较强的协同作用，可以去除S而不是N。与单独的农作物秸秆的HP相比，发现Co-HP可以稍微增加油中较轻化合物的含量。秸秆和UEO的协同HP还导致明显高于单独秸秆的HP（30.95–67.95％）的能量回收（73.26–83.45％）。由共HP工艺制得的热解油分为离心油（C-油）和萃取油（E-油），并且这些C-油的N和S含量要低得多（12-57 mg L ^-1和16-24毫克的L ^-1，分别地）比E-油（445-887毫克的L ^-1和71-112毫克的L ^-1， 分别）。而且，C油还表现出比E油稍高的饱和烃含量和较低的芳族化合物含量。