Abstract:

Steam reforming of methane（SRM）on Rh/MgO/γ-Al2O3 catalyst with contact time of milliseconds for producing hydrogen was studied.The effects of reactor temperature，space velocity and rhodium loading were investigated in detail at the H₂O/CH₄ molar ratio of 1 or 3.The results showed that Rh/MgO/γ-Al₂O₃ catalyst was extremely active and stable during the process of methane steam reforming.Under the conditions of rhodium loading of 5%(mass)，H₂O/CH₄ molar ratio of 3，reaction temperature at 1150 K and space velocity at 641.11 L•(g cat)^-1•h^-1，methane conversion could reach 90% and the selectivity to carbon dioxide was about 20%.The reaction performance approached nearly thermodynamic equilibrium within milliseconds contact time.A high reaction temperature benefited the progress of the reaction.

摘要：

采用负载型Rh/MgO/γ-Al₂O₃催化剂研究了毫秒级甲烷蒸汽重整过程，在水碳比为1和3的条件下，详细考察了反应温度、空速和催化剂Rh含量对反应转化率和选择性的影响。研究结果表明，Rh/MgO/γ-Al₂O₃催化剂在毫秒级操作条件下具有良好的催化性能，使用5%（质量分数）Rh催化剂，在水碳比3、反应温度1150 K、空速641.11 L•（g cat）^-1•h^-1时，CH₄转化率约90%，CO₂选择性约20%，毫秒级接触时间反应行为即可接近热力学平衡。高温有利于毫秒级甲烷蒸汽重整过程。