Megía Pedro J, García-Moreno Lourdes, Vizcaíno Arturo J, Calles José A, Carrero Alicia
Chemical and Environmental Engineering Group, Rey Juan Carlos University, Tulipán Street s/n, 28933 Móstoles, Madrid, Spain.
Institute of Sustainable Technologies, Rey Juan Carlos University, Tulipán Street s/n, 28933 Móstoles, Madrid, Spain.
Molecules. 2025 Mar 7;30(6):1206. doi: 10.3390/molecules30061206.
This work examines the influence of metal loading and the Ni/Cr ratio of Ni-Cr/SBA-15 catalysts on bioethanol steam reforming for the first time. The characterization of the synthesized samples reveals that higher Cr amounts result in lower Ni crystallite sizes due to the promoting effect of Cr, thereby enhancing the dispersion of the active phase. The catalytic performance has been evaluated in terms of ethanol conversion and H TOF (min). Ethanol conversion exhibits an increasing trend with higher Ni content, reaching up to 90% for samples containing 15 wt.%. By increasing the Cr content (lower Ni/Cr ratio) the results evidence a similar trend. A synergistic effect between Ni and Cr was appreciated in conversion values when the Ni content was below 11 wt.% and the Cr content exceeded 2 wt.%, which coincides with a smaller Ni crystallite size. Concerning the H TOF, the catalyst with the lowest Ni content (7 wt.%) exhibited a higher value with a notable enhancement upon increasing the Cr loading. However, a considerable decrease in H TOF was observed for samples with higher Ni loading. Therefore, the best catalytic performance, achieving nearly complete ethanol conversion and high hydrogen production, was reached when using catalysts with 7 wt.% Ni; the Cr loading should be increased to around 2 wt.%.
本研究首次考察了Ni-Cr/SBA-15催化剂的金属负载量和Ni/Cr比对生物乙醇蒸汽重整的影响。对合成样品的表征表明，由于Cr的促进作用，较高的Cr含量会导致较低的Ni微晶尺寸，从而增强活性相的分散性。已根据乙醇转化率和H TOF（分钟）对催化性能进行了评估。乙醇转化率随Ni含量的增加呈上升趋势，含15 wt.%的样品乙醇转化率高达90%。通过增加Cr含量（降低Ni/Cr比），结果显示出类似的趋势。当Ni含量低于11 wt.%且Cr含量超过2 wt.%时，在转化率值方面观察到Ni和Cr之间的协同效应，这与较小的Ni微晶尺寸一致。关于H TOF，Ni含量最低（7 wt.%）的催化剂表现出较高的值，并且随着Cr负载量的增加有显著提高。然而，对于较高Ni负载量的样品，观察到H TOF有相当大的下降。因此，使用含7 wt.% Ni的催化剂时可实现最佳催化性能，即几乎完全的乙醇转化和高氢气产量；Cr负载量应增加到约2 wt.%。
