Ru/Co-Al-O负载型催化剂的制备及其加氢脱氧性能研究

摘要

Co-Al layered double hydroxides were prepared by co-precipitation method and converted into composite oxides via calcination.The composite oxide were then used to prepare a series of Ru/Co-Al-O supported catalysts.The structures and properties of the catalysts were characterized by XRD,BET and FT-IR.The hydrodeoxygenation (HDO) properties of these catalysts were tested by using 4-methylphenol as a typical oxygen-containing model compound of lignin biomass oil.This study concentrated on the effects of Co/Al molar ratio and the reduction temperature of the catalyst on the hydrodeoxygenation activity of Ru/Co-Al-O and the optimization of HDO temperature.The results showed that when the molar ratio of Co/Al was 3∶1,the catalyst reduction temperature was 350 ℃ and the reaction temperature was 275 ℃,the HDO activity was the highest:both the conversion and deoxygenation degree in the HDO of p-methyl phenol reached up to 100％.%先采用共沉淀法制备出Co-Al类水滑石,其经煅烧后形成的复合氧化物用作载体制备出一系列Ru/Co-Al-O负载型催化剂,并采用XRD、BET、FT-IR等方法对其结构性能进行表征分析,最后以木质素生物质油的典型含氧化合物对甲基苯酚为模型,测试所制催化剂的加氢脱氧性能.主要研究了载体中Co/Al物质的量比、催化剂还原温度等因素对催化剂加氢脱氧活性的影响,并优化了HDO反应温度.结果表明,当Co/Al物质的量比为3∶1,催化剂还原温度为350℃,反应温度为275℃时,催化剂的加氢脱氧活性最高,催化对甲基苯酚加氢脱氧反应的转化率和脱氧率都达到了100％.