Hydrogen is defined the future energy carrier, and ethanol steam reforming can be a sustainable process for its production. Promoting the addition of lanthanum on a Ni-zirconia catalyst was evaluated, with a focus on the lanthanum introduction method (incipient wetness impregnation and coprecipitation). The lanthanum addition strongly affected the morphological, structural, and chemical features of the catalysts. It particularly affected the stabilization of the zirconia phase and the surface basic properties. For the promoted materials, a higher ethanol conversion and hydrogen yield were obtained. The best catalytic results with the catalyst prepared via promoter impregnation, 81% of ethanol conversion and 25% of H₂ yield after 16 h of reaction, were obtained. By a CO₂-TPD technique, it was estimated to be the most basic material. DRIFT analyses were used to understand the effect of basic sites in the reaction pathway. High numbers of medium and strong basic sites reduced the formation of unwanted intermediates such as ethylene. In this way, the formation of coke deposits is reduced. SEM, TG analyses, and Raman spectroscopy confirmed the results.

中文翻译：

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Ni-ZrO ₂镧催化剂上的乙醇蒸汽重整

氢气被定义为未来的能源载体，乙醇蒸汽重整可以是其生产的可持续过程。评估了在镍-氧化锆催化剂上促进镧的添加，重点是镧引入方法（初湿浸渍和共沉淀）。镧的添加强烈影响催化剂的形态，结构和化学特征。它特别影响了氧化锆相的稳定性和表面碱性。对于促进的材料，获得了更高的乙醇转化率和氢气产率。反应16小时后，通过促进剂浸渍制备的催化剂获得了最佳的催化效果，乙醇转化率为81％，H ₂产率为25％。通过CO ₂-TPD技术，据估计是最基本的材料。使用DRIFT分析来了解碱性位点在反应途径中的作用。大量的中型和强碱性位点减少了不需要的中间体（例如乙烯）的形成。这样，减少了焦炭沉积物的形成。SEM，TG分析和拉曼光谱证实了结果。