The ethanol steam reforming (ESR) process over cobalt-based zeolitic catalysts, differing significantly in the structure, was comprehensively examined. The cobalt spinel phase (10 wt%) was deposited on the surface of USY and ZSM-5 zeolites (Si/Al ratio of 31). The catalysts were characterized in terms of their chemical (ICP) and phase composition (XRD), textural properties (low-temperature N₂ adsorption), morphology (STEM/EDX), and reducibility (H₂-TPR). The aforementioned characteristics were supplemented by the catalysts’ acidity and redox properties investigations (quantitative FT-IR studies of pyridine and carbon monoxide adsorption). Catalysts’ activity was evaluated in the ESR process at 500°C for various ethanol/water mixtures. Both catalysts exhibited 100% ethanol conversion, whereas their selectivity toward H₂, CO₂, and C₂H₄ strongly depended on the applied ethanol-to-water molar ratio. Comparable selectivities observed for the 1 : 4 ratio were improved for the 1 : 9 ratio for both catalysts, as expected. For the ratio of 1 : 12, the significant difference in the reaction paths (the ethanol dehydration for CoUSY and the ethanol steam reforming for CoZSM-5) was explained by the cobalt reoxidation process facilitated by water molecules for the CoUSY. The superior overall performance of the CoZSM-5 catalyst in the ESR process, in comparison to CoUSY, also results from its almost three times enhanced accessibility of the cobalt species, as confirmed by the quantitative FT-IR studies of CO sorption. The microscopic studies also indicated a better dispersion of the cobalt phase supported on the ZSM-5 support. Thus, the structure of ZSM-5 zeolite assures higher cobalt active phase dispersion being more beneficial for the ESR process.

全面检查了钴基沸石催化剂上乙醇蒸汽重整（ESR）工艺的方法，该方法的结构差异很大。钴尖晶石相（10 wt％）沉积在USY和ZSM-5沸石（Si / Al比为31）的表面上。根据催化剂的化学性质（ICP）和相组成（XRD），结构性质（低温N ₂吸附），形态（STEM / EDX）和还原性（H ₂）对催化剂进行表征。-TPR）。催化剂的酸度和氧化还原性能研究（吡啶和一氧化碳吸附的FT-IR定量研究）补充了上述特性。在各种乙醇/水混合物的500°C ESR过程中评估了催化剂的活性。两种催化剂均显示出100％的乙醇转化率，而它们对H ₂，CO ₂和C ₂ H ₄的选择性在很大程度上取决于所施加的乙醇与水的摩尔比。如所预期的，对于两种催化剂的1：9比率，观察到的1：4比率的可比选择性均得到改善。对于1:12的比例，反应路径的显着差异（CoUSY的乙醇脱水和CoZSM-5的乙醇蒸汽重整）是由CoUSY的水分子促进的钴再氧化过程解释的。与CoUSY相比，CoZSM-5催化剂在ESR工艺中的优异总体性能还来自其钴物种可及性提高了近三倍，这已通过FT-IR定量研究CO吸附得到了证实。微观研究还表明，ZSM-5载体上钴相的分散性更好。从而，