Abstract The catalytic steam reforming of bio-ethanol will provide a sustainable route for renewable hydrogen production in a future hydrogen economy. Ni catalysts will be an economically attractive alternative to noble metals. Biochar is a promising reforming catalyst or catalyst support, having shown already good activity for tar reforming. The structure of biochar, its inherent alkali and alkaline earth metallic species and the content of O-containing functional groups are factors affecting its catalytic performance. A kinetic study of ethanol steam reforming and decomposition over a biochar-supported Ni catalyst is presented in this study in order to elucidate the role of biochar in the reaction mechanism. The effects of temperature, space velocity and reactant partial pressure were investigated over a range of conditions. The chemical structural features of used biochar samples were characterized with Raman spectroscopy. Biochar itself was found to be catalytically active and participating in ethanol reforming and decomposition. It was established that the reactions on Ni and biochar active sites were not independent. Analysis of kinetic compensation effects showed commonality on biochar and suggested that the rate-limiting step occurs in the dehydrogenation pathway on the biochar surface. O-containing functional groups in biochar were observed to reduce with reforming/decomposition time.

中文翻译：

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使用生物炭负载的镍催化剂进行乙醇蒸汽重整和分解的动力学特征

摘要 生物乙醇的催化蒸汽重整将为未来氢经济中可再生氢的生产提供一条可持续的途径。镍催化剂将是一种经济上有吸引力的贵金属替代品。生物炭是一种很有前途的重整催化剂或催化剂载体，已经显示出良好的焦油重整活性。生物炭的结构、其固有的碱金属和碱土金属种类以及含氧官能团的含量是影响其催化性能的因素。为了阐明生物炭在反应机理中的作用，本研究介绍了生物炭负载 Ni 催化剂上乙醇蒸汽重整和分解的动力学研究。在一系列条件下研究了温度、空速和反应物分压的影响。用拉曼光谱表征所用生物炭样品的化学结构特征。发现生物炭本身具有催化活性并参与乙醇重整和分解。确定 Ni 和 biochar 活性位点上的反应不是独立的。动力学补偿效应的分析显示了生物炭的共性，并表明限速步骤发生在生物炭表面的脱氢途径中。观察到生物炭中的含 O 官能团随着重整/分解时间的增加而减少。动力学补偿效应的分析显示了生物炭的共性，并表明限速步骤发生在生物炭表面的脱氢途径中。观察到生物炭中的含 O 官能团随着重整/分解时间的增加而减少。动力学补偿效应的分析显示了生物炭的共性，并表明限速步骤发生在生物炭表面的脱氢途径中。观察到生物炭中含 O 的官能团随着重整/分解时间的增加而减少。