摘要
制备了一系列 SBA-1 5负载 α-Fe2 O3 催化剂 .研究了负载量、预还原温度和反应温度对乙酸选择加氢制乙醛反应的活性和选择性的影响 .负载催化剂上乙醛的最高产率达到 4 2 .7% ,比纯α-Fe2 O3 催化剂的32 .2 %高 .催化剂表面 Fe3 O4和 Fe0共存对提高反应性能有利 .该反应有可能遵循 Mars-van Krevelen机理 .
A series of SBA-15 supported α-Fe 2O 3 catalysts were prepared and characterized. The influence of iron oxide loading, reduction temperature and reaction temperature on the catalytic activity and selectivity for the selective hydrogenation of acetic acid to acetaldehyde was investigated. The highest yield of acetaldehyde over the supported catalysts is 42\^7%, whereas that over non-supported α-Fe 2O 3 is only 32\^2%. The hydrogenation catalysts need to be prereduced before reaction. The optinum reduction temperatures for α-Fe 2O 3 and the supported catalyst are 873 and 923 K, respectively. The selective hydrogenation to acetaldehyde is favored when Fe 3O 4 and Fe 0 coexist on the catalyst surface, and acetaldehyde is likely formed via a Mars-van Krevelen reaction mechanism.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第1期121-124,共4页
Chemical Journal of Chinese Universities
基金
国家重点基础研究发展规划项目 (批准号 :G2 0 0 0 0 775 0 0 )资助
