Effects of loading methods and oxidation degree of support on the tar reforming activity of char-supported Ni catalyst using toluene as a model compound
Effects of loading methods and oxidation degree of support on the tar reforming activity of char-supported Ni catalyst using toluene as a model compound
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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载Ni催化剂焦油重整活性的影响
DOI：
10.1016/j.fuproc.2020.106347
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发表时间：
2020-05
影响因子：
7.5
通讯作者：
Li Fan
中科院分区：
文献类型：
--
作者：
Ren Liang;Yan Lun-Jing;Bai Yong -Hui;Liu Yan;Lv Peng;Wang Yu-Xian;Li Fan
生物质或低阶煤气化系统中存在的焦油需要脱除，以防止下游设备的堵塞和腐蚀。在这项研究中，采用不同的镍负载方法制备了催化剂：浸渍法、压力浸渍法和离子交换法，使用煤焦作为催化剂载体去除焦油。与其他两种催化剂相比，离子交换法制备的催化剂在甲苯（模型焦油）的蒸汽重整中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 负载量和 Ni 微晶尺寸 (NCS) 显着取决于载体的氧化程度。当用30% H2O2和30% HNO3氧化煤时，催化剂的Ni负载量分别为9.9 wt%和12.1 wt%，NCS分别为3.5 nm和4.5 nm。与HNO3相比，采用H2O2预处理制备的催化剂表现出更高的甲苯去除效率。
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% H2O2and 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 H2O2pretreatment exhibited a higher toluene removal efficiency.
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