This work targets to produce hydrogen-rich syngas by steam gasification of hydrochars obtained from co-hydrothermal carbonization (co-HTC) of polyvinyl chloride (PVC) and alkali coal. Hydrochar properties were assessed in terms of ultimate analysis, proximate analysis and the content of typical elements. The syngas, tar and char properties were investigated to explore the steam gasification performace of hydrochars. The co-HTC facilitated the destruction of the hydrophilic groups based on the O/C atomic ratio. The co-HTC increased the yield of H₂ and CH₄, while the CO₂ yield was concurrently reduced. A relative high H₂/CO ratio of around 1.65–3.96 was achieved when gasified hydrochar under the various temperature. This temperature was supposed to be an acceptable operational window for yielding H₂-rich syngas. The catalytic effect of alkali and alkaline earth metals (AAEMs) on H₂ production was weakened due to the AEEMs removal during the co-HTC, while the H₂ production could be remedied by the PVC addition. The evolution of poly-aromatic hydrocarbons (PAHs) convinced the event of primary or secondary tars transformed into the tertiary tar. The rich pore structure of char indicated that char have good potential in adsorption, and the adsorption experiment of malachite green confirmed this point of view.These findings will offer comprehensive data on the coal upgrading and hydrochar gasification.

这项工作的目标是通过对聚氯乙烯 (PVC) 和碱煤的共水热碳化 (co-HTC)获得的加氢炭进行蒸汽气化来生产富氢合成气。根据最终分析、近似分析和典型元素的含量来评估 Hydrochar 的特性。研究了合成气、焦油和炭的性质，以探索加氢炭的蒸汽气化性能。co-HTC 促进了基于 O/C 原子比的亲水基团的破坏。co-HTC增加了H ₂和CH ₄的产率，而同时降低了CO _{2 的}产率。相对较高的 H ₂在不同温度下气化氢化碳时，/CO 比约为 1.65-3.96。该温度应该是产生富H ₂合成气的可接受的操作窗口。碱金属和碱土金属 (AAEMs) 对 H ₂产生的催化作用由于协同 HTC 过程中 AEEMs 的去除而减弱，而 H ₂生产可以通过添加 PVC 来补救。多环芳烃 (PAH) 的演化证实了初级或次级焦油转化为三级焦油的事件。炭丰富的孔隙结构表明炭具有良好的吸附潜力，孔雀石绿的吸附实验证实了这一观点。这些发现将为煤改质和加氢炭气化提供全面的数据。