This study reports the roles of volatiles with distinctly-different chemistry in determining char reactivity and char structure during in situ volatile–char interactions under non-catalytic conditions. Volatiles were generated in situ from polyethylene (PE), double-acid washed biosolid (DAWB), polyethylene glycol (PEG) or cellulose and interacted with char prepared from DAWB that is free of catalytically-active inorganic species in a two-stage reactor at 1000 °C. The experimental results show that both H- and O-containing reactive species play different roles during in situ volatile–char interactions. It has been found that char reactivity decreases substantially after in situ volatile–char interactions. Results from Raman analysis of the char after in situ interactions with the PE volatiles show H-containing reactive species substantially enhance the condensation of the aromatic ring systems within the char, thus slightly decreasing the H content in char and also making char carbon structure considerably less reactive. It has also been found that the reactivity of char after in situ volatile–char interactions increases with increasing O/H molar ratio of volatiles. The results indicate that O-containing reactive species in volatiles can react with char to form CO complex oxides that mitigate the carbon structure from condensing into large aromatic ring systems, thus increasing O and H contents in char and enhancing char reactivity.

这项研究报告了在非催化条件下原位挥发物-炭相互作用过程中，具有不同化学性质的挥发物在确定炭反应性和炭结构方面的作用。在两阶段反应器中，由聚乙烯（PE），双酸洗涤生物固体（DAWB），聚乙二醇（PEG）或纤维素原位产生挥发物，并与由DAWB制备的无催化活性无机物的炭反应。 1000°C。实验结果表明，含H和O的反应性物质在原位挥发炭相互作用中起着不同的作用。已经发现，原位后炭反应性显着降低。volatile-char交互作用。与PE挥发物原位相互作用后，炭的拉曼分析结果表明，含H的反应性物质大大增强了炭中芳环系统的缩合，从而略微降低了炭中的H含量，并使炭的碳结构大大减少反应性的。还发现，原位挥发物-炭相互作用后，炭的反应性随挥发物O / H摩尔比的增加而增加。结果表明，挥发物中的含O反应性物质可与炭反应形成C O复合氧化物，从而减轻碳结构因缩合成大的芳环系统所致，从而增加了炭中O和H的含量并增强了炭反应性。