Difference in tar reforming activities between biochar catalysts activated in H2O and CO2
Difference in tar reforming activities between biochar catalysts activated in H2O and CO2
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DOI：
10.1016/j.fuel.2020.117636
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发表时间：
2020-07
期刊：
影响因子：
7.4
通讯作者：
Yurong Liu;M. Paskevicius;Hongqi Wang;C. Fushimi;G. Parkinson;Chun-Zhu Li
中科院分区：
文献类型：
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作者：
Yurong Liu;M. Paskevicius;Hongqi Wang;C. Fushimi;G. Parkinson;Chun-Zhu Li
本研究考察了在H2O和CO2中活化的生物炭催化剂在原位重整反应中的活性差异。实验在800℃的两级流态化/固定床中进行，木质生物炭在纯CO2或15Vol%H2O中活化，平衡Ar(15Vol)。%H2O/Ar)作用不同时间(0-50min)，然后用作焦油重整催化剂。通过对焦油样品的分析，发现H2O活化的生物炭在焦油的水蒸气重整和干法重整中表现出比CO2活化的生物炭更高的催化活性。此外，在其他相同的条件下，无论生物炭在何种气氛中被活化，在蒸汽中的重整总是比在二氧化碳中的重整快。生物炭的表征表明，与CO2活化相比，H2O活化生成的生物炭具有更多的含氧官能团和芳香族C-O结构。此外，水蒸气重整后的生物炭的含氧官能团含量和芳香族C-O结构均高于焦油干法重整后的结果。H2O和CO2活化的生物炭具有不同的催化活性，这可能是由于H2O和CO2活化生成的生物炭中含有不同数量的含氧官能团和芳香族C-O结构所致。在焦油重整过程中，额外的H2O供给对提高和保持生物炭的催化活性起着重要作用。
This study investigates the difference in the activities between biochar catalysts activated in H2O and CO2forin situtar reforming. The experiments were performed in a two-stage fluidized-bed/fixed-bed at 800 °C. Mallee wood biochar (106–250 μm) was activated in pure CO2or 15 vol% H2O balanced with Ar (15 vol. %H2O/Ar) for different times (0–50 mins) before being used as a catalyst for tar reforming. Based on the analysis of tar samples, it was found that H2O-activated biochar showed higher catalytic activity than CO2-activated biochar in both steam reforming and dry reforming of tar. Moreover, under otherwise identical conditions, reforming in steam was always more rapid than that in CO2regardless of the atmosphere in which biochar was activated. The characterisation of biochar showed that H2O activation resulted in a biochar with a higher content of O-containing functional groups and aromatic C-O structures than that from CO2activation. In addition, the content of O-containing functional groups and aromatic C-O structures of biochar after the steam reforming were higher than those after the dry reforming of tar. The different catalytic activities between the biochars activated by H2O and CO2could be attributed to the different amounts of O-containing functional groups and aromatic C-O structures in biochar generated by H2O or CO2activation. An extra supply of H2O plays an important role in improving and maintaining the catalytic activity of biochar during tar reforming.