Abstract It is necessary to remove the tars present in gasification systems of biomass or low-rank coal to prevent the blockage and corrosion of downstream equipment. In this study, catalysts were prepared using different Ni loading methods: impregnation, pressure impregnation, and ion exchange methods using coal char as a catalyst support for tar removal. The catalyst prepared by ion exchange method showed considerably better performance for the steam reforming of toluene (model tar) compared with the other two catalysts. The oxygen-containing groups of low-rank coal acted as cation-exchange sites, and the oxidation significantly increased the number of oxygen-containing groups. Therefore, the intrinsic correlation between oxidation degree of support and catalytic property was further explored. ICP analysis, XRD spectroscopy, and TEM images confirmed that Ni loading and Ni crystallite size (NCS) significantly depended on the oxidation degree of support. When coal was oxidized with 30% H2O2 and 30% HNO3, the Ni loadings of catalysts were 9.9 wt% and 12.1 wt%, and the NCS were 3.5 nm and 4.5 nm, respectively. Compared to HNO3, the catalyst prepared using H2O2 pretreatment exhibited a higher toluene removal efficiency.

中文翻译：

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负载方式和载体氧化程度对以甲苯为模型化合物的炭负载镍催化剂焦油重整活性的影响

摘要 生物质或低阶煤气化系统中存在的焦油需要去除，以防止下游设备的堵塞和腐蚀。在这项研究中，使用不同的 Ni 负载方法制备催化剂：浸渍、压力浸渍和离子交换方法，使用煤焦作为去除焦油的催化剂载体。与其他两种催化剂相比，离子交换法制备的催化剂对甲苯（模型焦油）的蒸汽重整表现出明显更好的性能。低阶煤的含氧基团作为阳离子交换位点，氧化显着增加了含氧基团的数量。因此，进一步探讨了载体氧化程度与催化性能之间的内在相关性。ICP分析，XRD光谱，和 TEM 图像证实 Ni 负载和 Ni 微晶尺寸 (NCS) 显着取决于载体的氧化程度。当煤用 30% H2O2 和 30% HNO3 氧化时，催化剂的 Ni 负载量为 9.9 wt% 和 12.1 wt%，NCS 分别为 3.5 nm 和 4.5 nm。与 HNO3 相比，使用 H2O2 预处理制备的催化剂表现出更高的甲苯去除效率。