Two structured manganese oxides (Birnessite and Todorokite) containing Co have been studied in the steam reforming of ethanol. It has been found that both materials are active in the hydrogen production, exhibiting high values of conversion of ethanol and selectivities to hydrogen (100% and 70%, respectively). The best results have been obtained with the catalyst based on Todorokite material. Characterization by DRX, BET area, TPR and TEM has allowed to find that the excellent performance exhibited by this material could be attributed to the lower size of the Co metallic particles present in this sample (6 nm vs 12 nm in Birnessite). This lower size could be related to the especial microporous structure of Todorokite precursor, which could provide high-quality positions for the stabilization of the Co metal particles during calcination and reduction steps. Catalytic deactivation has also been considered. Deactivation was found higher for Todorokite-based catalyst, which presented the largest amount of deposited carbon (26.2 wt% for Co-TOD vs 10.6 wt% for Co-BIR). On the other hand, the degree of metal sintering was found similar in both catalysts. Therefore, the deactivation of the catalysts has been attributed primarily to the deposition of coke. The results presented here show that it is possible to prepare new catalysts based on manganese oxides with Birnessite and Todorokite structure and promoted with Co with high catalytic performance in the steam reforming of ethanol.

在乙醇的蒸汽重整中，已经研究了两种含钴的结构化锰氧化物（水钠锰矿和钙锰矿）。已经发现两种材料都在制氢中具有活性，表现出高的乙醇转化率和对氢的选择性（分别为100％和70％）。使用基于Todorokite材料的催化剂获得了最佳结果。通过DRX，BET面积，TPR和TEM进行的表征已经发现，这种材料表现出的出色性能可能归因于该样品中存在的Co金属颗粒的尺寸较小（6 nm对Birnessite中为12 nm）。这种较小的尺寸可能与Todorokite前体的特殊微孔结构有关，它可以为煅烧和还原步骤中的Co金属颗粒的稳定化提供高质量的位置。还考虑了催化失活。对于以Todorokite为基础的催化剂发现失活更高，该催化剂呈现出最大的沉积碳量（Co-TOD为26.2 wt％，Co-BIR为10.6 wt％）。另一方面，发现两种催化剂的金属烧结度相似。因此，催化剂的失活主要归因于焦炭的沉积。此处给出的结果表明，在乙醇的水蒸气重整中，可以制备基于水钠锰矿和钙钛矿结构并被钴促进的具有锰氧化物催化性能的新型催化剂。对于以Todorokite为基础的催化剂发现失活更高，该催化剂呈现出最大的沉积碳量（Co-TOD为26.2 wt％，Co-BIR为10.6 wt％）。另一方面，发现两种催化剂的金属烧结度相似。因此，催化剂的失活主要归因于焦炭的沉积。此处给出的结果表明，在乙醇的水蒸气重整中，可以制备基于水钠锰矿和钙钛矿结构并被钴促进的具有锰氧化物催化性能的新型催化剂。对于以Todorokite为基础的催化剂发现失活更高，该催化剂呈现出最大的沉积碳量（Co-TOD为26.2 wt％，Co-BIR为10.6 wt％）。另一方面，发现两种催化剂的金属烧结度相似。因此，催化剂的失活主要归因于焦炭的沉积。此处给出的结果表明，在乙醇的水蒸气重整中，可以制备基于水钠锰矿和钙钛矿结构并被钴促进的具有锰氧化物催化性能的新型催化剂。催化剂的失活主要归因于焦炭的沉积。此处给出的结果表明，在乙醇的水蒸气重整中，可以制备基于水钠锰矿和钙钛矿结构并被钴促进的具有锰氧化物催化性能的新型催化剂。催化剂的失活主要归因于焦炭的沉积。此处给出的结果表明，在乙醇的水蒸气重整中，可以制备基于水钠锰矿和钙钛矿结构并被钴促进的具有锰氧化物催化性能的新型催化剂。